Have a question? My team and I are happy to hear your questions and get you answers! When you type a question, it shows up not only on that experiment but also here so you can easily find your answer. You'll find question boxes at the bottom of every experiment in the program.
It depends on the temperature and the pH. You can read more about how to care for fresh water shrimp here: https://caesarstropicalfish.com/blogs/news/a-guide-to-freshwater-shrimp-care
Question: from Aurora Lipper about the Star Gazing experiment :
It sounds like you may have downloaded the picture of a completed star wheel, instead of the two separate parts needed to make your own. Once you click on the link that takes you to Sky & Telescope, scroll down to the part that says "MAKE A STAR WHEEL". Then download Part 1 and Part 2.
Question: from arrowmakercpi about the Star Gazing experiment :
I downloaded the chart but it was too blurry to read. What do I do?
Question: from Aurora Lipper about the Hovercraft experiment :
Those are just some silly sound effects at the end of the video.
Question: from arrowmakercpi about the Hovercraft experiment :
What about the noise at the end of the video? Is it just sound effects, or do you actually have a cat? [We do]
Question: from Aurora Lipper about the Can Fish Drown? experiment :
When water sits in a fish tank without circulation, then there is nothing to replace the oxygen the fish breath out of the water. Also, the warmer the water is, the more air will escape out of the water. Yes, less air will escape when in a cold climate, but there still needs to be circulation to introduce new oxygen into the water. As you said tides, wind, storms, and currents help distribute oxygen. Lakes and ponds often have rivers or small creeks that introduce turbulence...which introduces air. But, fish are less likely to survive in a pond that is stagnant. Keep in mind that underwater plants help introduce oxygen, but there still needs to be movement in the water to distribute that oxygen.
Question: from Aurora Lipper about the Can Fish Drown? experiment :
This experiment demonstrates that air is dissolved in water and that the amount of air dissolved varies based on the water's temperature. If a body of water is stagnant and gets too warm, there may not be enough air for the fish to breath.
Question: from Aurora Lipper about the Fast Ball experiment :
Speed describes how fast something is going. Velocity describes the change in distance over a given amount of time. Acceleration describes a change in speed or velocity.
Question: from elaineeng208 about the Fast Ball experiment :
How is acceleration different from speed and velocity?
To be clear we are disposing the Potassium permanganatein the trash?
Question: from vasquezfun about the Can Fish Drown? experiment :
I'd like to re-ask this question. Is heating up the water and the air escaping in the test tube similar to air sitting still in a fish tank and the air leaving? What if water sat still in a very cold climate? Would less O escape? Does it then escape faster in warmer climates? And does this mean that while the ocean is constantly moving (tides, wind, storms, etc.) that this helps to keep the O adding? How about lakes, ponds, puddles? thanks
Question: from vasquezfun about the Can Fish Drown? experiment :
I still don't understand how the connection of this experiment to fish needing the air.
Remember that math gives us a way to describe what was written in the word problem.
As the boulder rolls down the hill, friction performs work against the boulder. That works takes away some of the energy. That’s how we arrive at KE = PE - WFS.
In this unit we learn about conservation of energy. The concept of potential energy equaling kinetic energy is a way to write out that concept as a formula.
As the car rolls up the emergency ramp, its kinetic energy (motion) is converted into potential energy. Once the car is at rest at the top of the ramp, it has only potential energy.
By using the PE and KE formulas together, we’re able to determine the distance it takes for the car to come to a stop.
We have this project: https://www.sciencelearningspace2.com/2010/03/underwater-r-o-v-robot/.However, it uses a wired connection for controls and doesn't include a camera.
JMJ Dear Aurora and friends
I have a question . We have a couple of good sized ponds and creeks on our property. I was wondering if you have any instructions on building a submersible we can remote control and has a camera which projects to an app or in another form to our phone or tablets. We want to combine it with biology and studies for our property, like fish stocking ponds, controlling plant growths in the ponds etc
In question 13, it says that potential energy equals kinetic energy without any explanation. Why are they equal?
Question: from rebecca_thomas about the Volcanoes experiment :
We made a volcano cake once for my son! We used dry ice and something else(and something else to make it erupt. I wish I could remember what it was. It was a big hit with all his friends.
Question: from arrowmakercpi about the Building Bridges experiment :
cool! i did this on a slightly wobbly table that i made an earthquake with, and used a small fan to create "hurricane force" winds! thx for the fun aurora!
Question: from Aurora Lipper about the Explosions experiment :
This is an example of the distributive property. We start with 0=MV+m(v+V) then, we multiply m times v and m times V. This becomes 0=MV+mv+mV. Then we collect the terms so the equation is 0 = V (M + m) + mv.
Question: from Aurora Lipper about the Non-constant Mass experiment :
You're right the value is 7000. Not sure where 6440 came from.
Question: from Aurora Lipper about the Fruit Battery experiment :
Sure, you can use an orange.
Question: from Aurora Lipper about the Tetrahedral Kite experiment :
No, regular paper won't work because it is too heavy. You'll need to use tissue paper.
Question: from herdingkittens about the Non-constant Mass experiment :
At 3:50 it says 6400 Newtons, but I got 7000. What's going on?
Question: from ruthmmartens about the Fruit Battery experiment :
Can I use an orange instead of a lemon or lime?
Question: from arrowmakercpi about the Tetrahedral Kite experiment :
Can I use regular paper instead of tissue paper? I don't have tissue paper.
Question: from herdingkittens about the Explosions experiment :
Agar is a gelatinous substance made from various kinds of red seaweed. It is what we call a biological culture media. In other words, we use it as food for bacteria. It is available in powder and pre-mixed forms here: https://www.homesciencetools.com/. Just search on the word agar.
Question: from arrowmakercpi about the Liquid Prism experiment :
can you use an old CD instead of a mirror? pretty sure it does the same thing........
Question: from Aurora Lipper about the Nerve Tester experiment :
Most coathangers have a thin coating over the metal. The most common problem is that coating hasn't been removed. Be sure to rub sandpaper across the entire coat hanger to remove that epoxy coating. Also, try reversing the connections for your LED. It might be connected backwards. If you still have problems, please take pictures of your setup and email them to [email protected].
To clean the lenses on your microscope, you will need lens cleaning brush and lens cleaning spray or isopropyl alcohol. These are available from Amazon and stores that sell camera supplies.
Be sure to never wipe the lens with tissues or paper towels. That could scratch the coatings on the lenses. Never touch the lenses with your fingers. That will leave oily fingerprints, which can be difficult to remove.
Use the lens cleaning brush lightly brush away any dust. Then spray a little bit of lens spray (or use isopropyl alcohol) onto a cotton swab. Using the moist tip of the cotton swab, rub the lens in a circular motion. Don’t wipe the lens with a cloth. The alcohol will evaporate on its own.
Question: from arrowmakercpi about the Nerve Tester experiment :
not working. i connected all the wires [CAREFULLY] according to the video.
The Instant Ice experiment is here: https://www.sciencelearningspace2.com/2011/06/instant-ice/ There's a link to it in the description and also it's the experiment just before this one.
Question: from carolinametzgers about the Hot Ice Sculptures experiment :
Where's the video you were talking about in this video? The crystal structure one, where it froze instantly.
Electricity flowing through a wire creates a magnetic field. The magnets also create a magnetic field. When you connect the wire to the battery, current begins to flow which creates a magnetic field. That magnetic field from the wire interacts with the magnetic field from the magnet, causing it to spin...due to attraction and repulsion. This is an example of a homopolar motor.
Question: from Aurora Lipper about the Laser Safety experiment :
nm stands for nanometer. This describes the wavelength (color) of the light. Due to the "concentrated" nature of laser light, you should consider any laser to be harmful to eyes and no laser should be pointed towards anyone's eyes...including pets.
Question: from Aurora Lipper about the Solar Car experiment :
The solar cell in Brian's electronics kits aren't intended to drive motors. You will need to purchase a solar cell rated for 3V or more.
Question: from arrowmakercpi about the Laser Safety experiment :
What does "nm" stand for? My laser sticker says 635 nm.Under what circumstances is that harmful?
Question: from arrowmakercpi about the Solar Car experiment :
My car is not working! I am using the solar cell from Brian's electronics kit and a normal 3V DC motor.
White glue has the proper chemicals to make this experiment work. Clear glue will not work.
Question: from Aurora Lipper about the Two-Wheeler Robot experiment :
You can also use bottle tops from water bottles.
Question: from Aurora Lipper about the Wind Turbine experiment :
Feel free to use any DC motor up to 18VDC...as long as you can attach a propeller to it.
Question: from Aurora Lipper about the Flying Paper Clip experiment :
Sometimes students like to tape the string to the table instead of holding it with their finger.
Question: from Aurora Lipper about the BumperBot experiment :
There is most likely a bad connection, but I will need to see what you built in order to help. Please send pictures to [email protected]. Be sure to describe the problem in your email.
Question: from arrowmakercpi about the Jigglebots experiment :
I used a GIANT clothes pin for my third jigglebot, and it is very fun watching it jiggle around on the table, and I enjoy changing the position\angle of the skewers to see the different things it would do. Thank you for the fun, Aurora!!!
Question: from arrowmakercpi about the Two-Wheeler Robot experiment :
I do not have the wine bottle lids or cork. Is there something I can use instead?
Question: from arrowmakercpi about the Wind Turbine experiment :
Can you use a normal motor? I have a 3V DC motor and a 12V DC motor.
Be sure that you are using the proper transistors in the proper locations. A common mistake is to use the wrong transistor. If you need help, please take a few pictures where I can see the entire breadboard, and email them to [email protected]. Be sure to include the name of the project and the problem in the email.
The laser door alarm and flashlight laser tag actually have different behavior. Notice that the door alarm circuit only uses one transistor, and the laser tag circuit uses two. The door alarm sounds an alarm anytime the laser hits the photocell. The flashlight laser tag circuit keeps the LED glowing once light hits the photocell (this is called a latching circuit).
Yes indeed, we use math during flight. We need to calculate how much fuel is needed for a flight, or the rate of decent or ascent when changing altitude. We also need to calculate estimated times of arrival. We also use geometry when navigating.
My LED won't light even when I hold the button down and cover the CdS cell with light! This is confusing. First my LED lights no matter what, now it does not light no matter what!
Question: from Aurora Lipper about the Hovercraft experiment :
Yes, its okay if both motors are round. You just need to be sure to secure them against the foam. For the foam tray, you can check with the butcher counter as your grocery store. They'll often just give you one.
Question: from Aurora Lipper about the BumperBot experiment :
Best thing is to make a note of this experiment. Then you can build it once you're able to get the supplies.
Both rechargeable and non-rechargeable batteries provide direct current (DC).
Direct current means positive is always positive and negative is always negative.
Battery chargers take the alternating current (AC) from wall outlets, convert it to DC, and regulate the voltage and current to properly charge the batteries.
Question: from arrowmakercpi about the Hovercraft experiment :
Aurora, I lost the package [with the hovercraft props] that comes with our 2nd month of enrollment. HELP.
Question: from arrowmakercpi about the Hovercraft experiment :
Is it okay if both of my motors are round? Also, where can I get the meat tray? Getting a 2-hotdog deal
and a shake from Cookout provided me with the foam [hamburger] container and the 16-oz cup.
Question: from arrowmakercpi about the BumperBot experiment :
I REALLY want to make this but I do not have the wheels... I have something similar called a boomerang car that automatically switches directions whether it hits something or not, but it would be fun to have it switch directions only when it hits something.
Also, I have a question. Do rechargable batteries provide AC [alternating current] or DC [direct current]? Rechargable batteries are charged by power outlets [AC], but don't batteries provide DC???
Question: from arrowmakercpi about the Jigglebots experiment :
My second jigglebot goes in a circle AND a straight line, depending on if it hits a slight crack in the floor or not. My first one did not do much, just shaking [I used different things for weights].
Please review the material list for Unit 14. It provides a link to hookup wire at Jameco.com.
Keep in mind that hookup wire is just solid core wire. It is the same as the jumper wires used in other breadboard projects.
Solder is used to permanently hold parts onto the circuit board, while also providing the proper electrical connection. For a detailed explanation on soldering, please visit Unit 25 and watch Brian's Soldering Basics Videos.
It may just be too bright in the room where you're using the circuit. Or, you may have a bad connection. First, make sure all of your connections are good, then try out your circuit in a fairly dark room. If the LED still continues to glow no matter what, go back to a bright room and take a couple well lit pictures of your entire circuit and email them to [email protected]. Be sure to mention the problem in your email.
Question: from Aurora Lipper about the Gyro Wheel experiment :
No, we don't have a recommendation for any specific gyroscopes. There are lots of choices on Amazon or other online sellers.
When I hold the momentary switch down, even though there may not be light shining on it, the LED lights! I have tried covering the CdS cell completely, but the LED still lights! It was working before. What did I do?????
Question: from amberdawnbook about the Gyro Wheel experiment :
Do you have a recommendation for a particular gyroscope?
Question: from Aurora Lipper about the Bristle Brush Bot experiment :
Ohms and volts are actually measuring two different things. Ohms measures resistance to the flow of electrical current. Voltage measures electrical potential, also called electromotive force. You can think of voltage as trying to "push" electrons.
Answer: Terraqua Column
It depends on the temperature and the pH. You can read more about how to care for fresh water shrimp here: https://caesarstropicalfish.com/blogs/news/a-guide-to-freshwater-shrimp-care
Answer: Robotic Hand
Something springy and elastic will be a good substitute.
Answer: Calorimeter
Yes, we want as much heat as possible to go into the water.
Answer: Turning Copper into Silver into Gold
You can find most of the materials at hometrainingtools.com
Answer: Simple Hovercraft
To allow the air to escape very slowly and consistently, not all at once.
Question: from baileyalferez about the Terraqua Column experiment :
Would Freshwater shrimp survive?
Question: from subs4sktipre about the Robotic Hand experiment :
Can you use other rubber bands to substitute for these ones?
Question: from herdingkittens about the Calorimeter experiment :
Do you have to put a lid on the coffee cup to prevent heat escaping into the surrounding air?
Question: from kmosby716 about the Simple Hovercraft experiment :
what are the holes in the cap for?
Question: from amy_lawrence about the Turning Copper into Silver into Gold experiment :
can i get links for all supplies
Question: from Aurora Lipper about the Star Gazing experiment :
It sounds like you may have downloaded the picture of a completed star wheel, instead of the two separate parts needed to make your own. Once you click on the link that takes you to Sky & Telescope, scroll down to the part that says "MAKE A STAR WHEEL". Then download Part 1 and Part 2.
Question: from arrowmakercpi about the Star Gazing experiment :
I downloaded the chart but it was too blurry to read. What do I do?
Question: from Aurora Lipper about the Solar Drinking Bird experiment :
The original drinking bird works best when the water is room temperature.
Question: from kateryna_moheb about the Solar Drinking Bird experiment :
Does it work better with hot or cold water?
Question: from Aurora Lipper about the Hovercraft experiment :
Those are just some silly sound effects at the end of the video.
Question: from arrowmakercpi about the Hovercraft experiment :
What about the noise at the end of the video? Is it just sound effects, or do you actually have a cat? [We do]
Question: from Aurora Lipper about the Can Fish Drown? experiment :
When water sits in a fish tank without circulation, then there is nothing to replace the oxygen the fish breath out of the water. Also, the warmer the water is, the more air will escape out of the water. Yes, less air will escape when in a cold climate, but there still needs to be circulation to introduce new oxygen into the water. As you said tides, wind, storms, and currents help distribute oxygen. Lakes and ponds often have rivers or small creeks that introduce turbulence...which introduces air. But, fish are less likely to survive in a pond that is stagnant. Keep in mind that underwater plants help introduce oxygen, but there still needs to be movement in the water to distribute that oxygen.
Question: from Aurora Lipper about the Can Fish Drown? experiment :
This experiment demonstrates that air is dissolved in water and that the amount of air dissolved varies based on the water's temperature. If a body of water is stagnant and gets too warm, there may not be enough air for the fish to breath.
Question: from Aurora Lipper about the Fast Ball experiment :
Speed describes how fast something is going. Velocity describes the change in distance over a given amount of time. Acceleration describes a change in speed or velocity.
Question: from elaineeng208 about the Fast Ball experiment :
How is acceleration different from speed and velocity?
Answer: Generating Oxygen
This is included in the C3000 kit.
Question: from vasquezfun about the Generating Oxygen experiment :
Where do you get the rubber tubing from?
Question: from vasquezfun about the Generating Oxygen experiment :
To be clear we are disposing the Potassium permanganatein the trash?
Question: from vasquezfun about the Can Fish Drown? experiment :
I'd like to re-ask this question. Is heating up the water and the air escaping in the test tube similar to air sitting still in a fish tank and the air leaving? What if water sat still in a very cold climate? Would less O escape? Does it then escape faster in warmer climates? And does this mean that while the ocean is constantly moving (tides, wind, storms, etc.) that this helps to keep the O adding? How about lakes, ponds, puddles? thanks
Question: from vasquezfun about the Can Fish Drown? experiment :
I still don't understand how the connection of this experiment to fish needing the air.
Question: from Aurora Lipper about the Light Speed Particles experiment :
Remember that math gives us a way to describe what was written in the word problem. As the boulder rolls down the hill, friction performs work against the boulder. That works takes away some of the energy. That’s how we arrive at KE = PE - WFS.
Question: from Aurora Lipper about the Light Speed Particles experiment :
In this unit we learn about conservation of energy. The concept of potential energy equaling kinetic energy is a way to write out that concept as a formula. As the car rolls up the emergency ramp, its kinetic energy (motion) is converted into potential energy. Once the car is at rest at the top of the ramp, it has only potential energy. By using the PE and KE formulas together, we’re able to determine the distance it takes for the car to come to a stop.
Question: from Aurora Lipper about the Shopping List for Unit 10 experiment :
We have this project: https://www.sciencelearningspace2.com/2010/03/underwater-r-o-v-robot/.However, it uses a wired connection for controls and doesn't include a camera.
Question: from christyoctavo about the Shopping List for Unit 10 experiment :
JMJ Dear Aurora and friends I have a question . We have a couple of good sized ponds and creeks on our property. I was wondering if you have any instructions on building a submersible we can remote control and has a camera which projects to an app or in another form to our phone or tablets. We want to combine it with biology and studies for our property, like fish stocking ponds, controlling plant growths in the ponds etc
Question: from herdingkittens about the Light Speed Particles experiment :
In question 19, it uses the formula, 'KE=PE-Wf'. Shouldn't it be, 'KE=PE+Wf'?
Question: from herdingkittens about the Light Speed Particles experiment :
In question 13, it says that potential energy equals kinetic energy without any explanation. Why are they equal?
Question: from rebecca_thomas about the Volcanoes experiment :
We made a volcano cake once for my son! We used dry ice and something else(and something else to make it erupt. I wish I could remember what it was. It was a big hit with all his friends.
Question: from arrowmakercpi about the Building Bridges experiment :
cool! i did this on a slightly wobbly table that i made an earthquake with, and used a small fan to create "hurricane force" winds! thx for the fun aurora!
Question: from Aurora Lipper about the Explosions experiment :
This is an example of the distributive property. We start with 0=MV+m(v+V) then, we multiply m times v and m times V. This becomes 0=MV+mv+mV. Then we collect the terms so the equation is 0 = V (M + m) + mv.
Question: from Aurora Lipper about the Non-constant Mass experiment :
You're right the value is 7000. Not sure where 6440 came from.
Question: from Aurora Lipper about the Fruit Battery experiment :
Sure, you can use an orange.
Question: from Aurora Lipper about the Tetrahedral Kite experiment :
No, regular paper won't work because it is too heavy. You'll need to use tissue paper.
Question: from herdingkittens about the Non-constant Mass experiment :
At 3:50 it says 6400 Newtons, but I got 7000. What's going on?
Question: from ruthmmartens about the Fruit Battery experiment :
Can I use an orange instead of a lemon or lime?
Question: from arrowmakercpi about the Tetrahedral Kite experiment :
Can I use regular paper instead of tissue paper? I don't have tissue paper.
Question: from herdingkittens about the Explosions experiment :
At 4:35 where did the extra little 'm' come from?
Question: from hdtaphorn about the Quantum Mechanics: Double Slit Experiment experiment :
I loved the video. thank you so much Aurora
Question: from Aurora Lipper about the Liquid Prism experiment :
A CD will separate colors all on its own, so it won't work for this experiment. It is best to use a mirror.
Question: from Aurora Lipper about the Ideas for Exploring Microscopic Life experiment :
Agar is a gelatinous substance made from various kinds of red seaweed. It is what we call a biological culture media. In other words, we use it as food for bacteria. It is available in powder and pre-mixed forms here: https://www.homesciencetools.com/. Just search on the word agar.
Question: from carolinametzgers about the Ideas for Exploring Microscopic Life experiment :
What is agar and where can I find it? Thank you!
Question: from arrowmakercpi about the Liquid Prism experiment :
can you use an old CD instead of a mirror? pretty sure it does the same thing........
Question: from Aurora Lipper about the Nerve Tester experiment :
Most coathangers have a thin coating over the metal. The most common problem is that coating hasn't been removed. Be sure to rub sandpaper across the entire coat hanger to remove that epoxy coating. Also, try reversing the connections for your LED. It might be connected backwards. If you still have problems, please take pictures of your setup and email them to [email protected].
Question: from Aurora Lipper about the Anatomy of the Microscope experiment :
To clean the lenses on your microscope, you will need lens cleaning brush and lens cleaning spray or isopropyl alcohol. These are available from Amazon and stores that sell camera supplies. Be sure to never wipe the lens with tissues or paper towels. That could scratch the coatings on the lenses. Never touch the lenses with your fingers. That will leave oily fingerprints, which can be difficult to remove. Use the lens cleaning brush lightly brush away any dust. Then spray a little bit of lens spray (or use isopropyl alcohol) onto a cotton swab. Using the moist tip of the cotton swab, rub the lens in a circular motion. Don’t wipe the lens with a cloth. The alcohol will evaporate on its own.
Question: from arrowmakercpi about the Nerve Tester experiment :
not working. i connected all the wires [CAREFULLY] according to the video.
Question: from hdtaphorn about the Hydraulic Pneumatic Earth Mover experiment :
That was so cool! Thank you so much Aurora.
Question: from Aurora Lipper about the Barrel Roof experiment :
The "circular" shape should form naturally as you make the folds. Were you able to print out the folding template?
Answer: Hot Ice Sculptures
The Instant Ice experiment is here: https://www.sciencelearningspace2.com/2011/06/instant-ice/ There's a link to it in the description and also it's the experiment just before this one.
Question: from carolinametzgers about the Hot Ice Sculptures experiment :
Where's the video you were talking about in this video? The crystal structure one, where it froze instantly.
Question: from carolinametzgers about the Anatomy of the Microscope experiment :
How do you clean the objective lenses and eyepiece lense? Thank you!
Question: from subs4sktipre about the Barrel Roof experiment :
No matter what we do, we can't get to that shape to pull out the Barrel roof. How are you making that "circle"? Thank you.
Question: from Aurora Lipper about the Quick 'n' Easy DC Motor experiment :
Electricity flowing through a wire creates a magnetic field. The magnets also create a magnetic field. When you connect the wire to the battery, current begins to flow which creates a magnetic field. That magnetic field from the wire interacts with the magnetic field from the magnet, causing it to spin...due to attraction and repulsion. This is an example of a homopolar motor.
Question: from Aurora Lipper about the Laser Safety experiment :
nm stands for nanometer. This describes the wavelength (color) of the light. Due to the "concentrated" nature of laser light, you should consider any laser to be harmful to eyes and no laser should be pointed towards anyone's eyes...including pets.
Question: from Aurora Lipper about the Solar Car experiment :
The solar cell in Brian's electronics kits aren't intended to drive motors. You will need to purchase a solar cell rated for 3V or more.
Question: from arrowmakercpi about the Laser Safety experiment :
What does "nm" stand for? My laser sticker says 635 nm.Under what circumstances is that harmful?
Question: from arrowmakercpi about the Solar Car experiment :
My car is not working! I am using the solar cell from Brian's electronics kit and a normal 3V DC motor.
Question: from arrowmakercpi about the Electric Spinning Flyer experiment :
cool!
Question: from Aurora Lipper about the Bouncy Putty Slime experiment :
White glue has the proper chemicals to make this experiment work. Clear glue will not work.
Question: from Aurora Lipper about the Two-Wheeler Robot experiment :
You can also use bottle tops from water bottles.
Question: from Aurora Lipper about the Wind Turbine experiment :
Feel free to use any DC motor up to 18VDC...as long as you can attach a propeller to it.
Question: from Aurora Lipper about the Flying Paper Clip experiment :
Sometimes students like to tape the string to the table instead of holding it with their finger.
Question: from Aurora Lipper about the BumperBot experiment :
There is most likely a bad connection, but I will need to see what you built in order to help. Please send pictures to [email protected]. Be sure to describe the problem in your email.
Question: from Aurora Lipper about the Bread Board Basics experiment :
The purpose of this video is to help you identify different kinds of parts. No specific materials are needed for this video.
Question: from emringle about the Bouncy Putty Slime experiment :
why does it need to be white? can it be clear?
Question: from arrowmakercpi about the Jigglebots experiment :
I used a GIANT clothes pin for my third jigglebot, and it is very fun watching it jiggle around on the table, and I enjoy changing the position\angle of the skewers to see the different things it would do. Thank you for the fun, Aurora!!!
Question: from arrowmakercpi about the Two-Wheeler Robot experiment :
I do not have the wine bottle lids or cork. Is there something I can use instead?
Question: from arrowmakercpi about the Wind Turbine experiment :
Can you use a normal motor? I have a 3V DC motor and a 12V DC motor.
Question: from reneeprehm about the Flying Paper Clip experiment :
what is the tape for?
Question: from arrowmakercpi about the BumperBot experiment :
I found three lids & punched holes in them, then I built the robot. It was just working, but now the motor won't turn no matter what I do-help?
Question: from arrowmakercpi about the Bread Board Basics experiment :
Can you attach the materials list above the video so we can be able to tell what we need before watching the video?
Question: from arrowmakercpi about the Quick 'n' Easy DC Motor experiment :
How does this work?
Question: from Aurora Lipper about the Flashlight Laser Tag experiment :
Be sure that you are using the proper transistors in the proper locations. A common mistake is to use the wrong transistor. If you need help, please take a few pictures where I can see the entire breadboard, and email them to [email protected]. Be sure to include the name of the project and the problem in the email.
Question: from Aurora Lipper about the Flashlight Laser Tag experiment :
The laser door alarm and flashlight laser tag actually have different behavior. Notice that the door alarm circuit only uses one transistor, and the laser tag circuit uses two. The door alarm sounds an alarm anytime the laser hits the photocell. The flashlight laser tag circuit keeps the LED glowing once light hits the photocell (this is called a latching circuit).
Question: from Aurora Lipper about the The velocity-time "v-t" graphs experiment :
Yes indeed, we use math during flight. We need to calculate how much fuel is needed for a flight, or the rate of decent or ascent when changing altitude. We also need to calculate estimated times of arrival. We also use geometry when navigating.
Question: from arrowmakercpi about the Flashlight Laser Tag experiment :
My LED won't light even when I hold the button down and cover the CdS cell with light! This is confusing. First my LED lights no matter what, now it does not light no matter what!
Question: from arrowmakercpi about the Flashlight Laser Tag experiment :
This project works the same way as Laser Door Alarm [does the same thing], so why isn't it the same circuit but on a breadboard?
Question: from Christian Jones about the The velocity-time "v-t" graphs experiment :
do you use this math in flight?
Question: from Aurora Lipper about the Hovercraft experiment :
Yes, its okay if both motors are round. You just need to be sure to secure them against the foam. For the foam tray, you can check with the butcher counter as your grocery store. They'll often just give you one.
Question: from Aurora Lipper about the BumperBot experiment :
Best thing is to make a note of this experiment. Then you can build it once you're able to get the supplies. Both rechargeable and non-rechargeable batteries provide direct current (DC). Direct current means positive is always positive and negative is always negative. Battery chargers take the alternating current (AC) from wall outlets, convert it to DC, and regulate the voltage and current to properly charge the batteries.
Question: from arrowmakercpi about the Hovercraft experiment :
Aurora, I lost the package [with the hovercraft props] that comes with our 2nd month of enrollment. HELP.
Question: from arrowmakercpi about the Hovercraft experiment :
Is it okay if both of my motors are round? Also, where can I get the meat tray? Getting a 2-hotdog deal and a shake from Cookout provided me with the foam [hamburger] container and the 16-oz cup.
Question: from arrowmakercpi about the BumperBot experiment :
I REALLY want to make this but I do not have the wheels... I have something similar called a boomerang car that automatically switches directions whether it hits something or not, but it would be fun to have it switch directions only when it hits something. Also, I have a question. Do rechargable batteries provide AC [alternating current] or DC [direct current]? Rechargable batteries are charged by power outlets [AC], but don't batteries provide DC???
Question: from arrowmakercpi about the Jigglebots experiment :
My second jigglebot goes in a circle AND a straight line, depending on if it hits a slight crack in the floor or not. My first one did not do much, just shaking [I used different things for weights].
Question: from arrowmakercpi about the Remote Controls II experiment :
I used a really small cardboard box instead of a soap box to make my jigglebot turn on and off!
Question: from Aurora Lipper about the Lie Detector Circuit experiment :
Please review the material list for Unit 14. It provides a link to hookup wire at Jameco.com. Keep in mind that hookup wire is just solid core wire. It is the same as the jumper wires used in other breadboard projects.
Question: from Aurora Lipper about the Door Knob Touch Alarm experiment :
Solder is used to permanently hold parts onto the circuit board, while also providing the proper electrical connection. For a detailed explanation on soldering, please visit Unit 25 and watch Brian's Soldering Basics Videos.
Question: from Aurora Lipper about the Flashlight Laser Tag experiment :
It may just be too bright in the room where you're using the circuit. Or, you may have a bad connection. First, make sure all of your connections are good, then try out your circuit in a fairly dark room. If the LED still continues to glow no matter what, go back to a bright room and take a couple well lit pictures of your entire circuit and email them to [email protected]. Be sure to mention the problem in your email.
Question: from Aurora Lipper about the Gyro Wheel experiment :
No, we don't have a recommendation for any specific gyroscopes. There are lots of choices on Amazon or other online sellers.
Question: from arrowmakercpi about the Lie Detector Circuit experiment :
where can I get the hookup wire???
Question: from arrowmakercpi about the Door Knob Touch Alarm experiment :
Why do we need to solder? [9 years old]
Question: from arrowmakercpi about the Flashlight Laser Tag experiment :
When I hold the momentary switch down, even though there may not be light shining on it, the LED lights! I have tried covering the CdS cell completely, but the LED still lights! It was working before. What did I do?????
Question: from amberdawnbook about the Gyro Wheel experiment :
Do you have a recommendation for a particular gyroscope?
Question: from Aurora Lipper about the Bristle Brush Bot experiment :
Vibrating motors are also available from Jameco: https://www.jameco.com/z/6ZK053-R-Jameco-ReliaPro-3-Volt-DC-Vibrating-Motor-75mA-8500rpm-1-Inch-Wire-Leads_256314.html
Question: from Aurora Lipper about the Bristle Brush Bot experiment :
Watch batteries are available at most drug stores and hardware stores.
Question: from Aurora Lipper about the Build an LED Brightness Control experiment :
Ohms and volts are actually measuring two different things. Ohms measures resistance to the flow of electrical current. Voltage measures electrical potential, also called electromotive force. You can think of voltage as trying to "push" electrons.
Question: from Aurora Lipper about the Flashlight Laser Tag experiment :
Sure, you can either replace LED1 and R2 with a buzzer, or put a buzzer in parallel with LED1 and R2.