mysolarsystem-thumbnailWhat would happen if our solar system had three suns?  Or the Earth had two moons? You can find out all these and more with this lesson on orbital mechanics. Instead of waiting until you hit college, we thought we’d throw some university-level physics at you… without the hard math.
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To get you experienced with the force of gravity without getting lost in the math, there’s an excellent computer program that allows you to see how multi-object systems interact. Most textbooks are limited to the interaction between a very large object, like the Earth, and much smaller objects that are very close to it, like the Moon. This seriously cuts out most of the interesting solar systems that are out there in the real universe.


The University of Colorado at Boulder designed a great system to do the hard math for you. Don’t be fooled by the simplistic appearance – the physics behind the simulation is rock-solid… meaning that the results you get are exactly what scientists would predict to happen.


How do I design a solar system?

Go to the My Solar System simulation on the PhET website and carefully follow the instructions for each activity. Answer the questions and record your results before going on to the next activity. Click here to RUN the simulation on the internet.


Here’s what you should see and do:



Download Student Worksheet & Exercises


Exercises:


  1. What effect does changing the mass of orbiting planet have on the diameter of the orbit?
  2. What effect does changing the speed have on a planet’s orbit?
  3. What happens to the planet’s orbit when you increase the initial distance between the planet and the Sun?
  4. Find the mass values needed for a stable orbit. Circle the values on the table that make a stable orbit.
  5. Why don’t a feather and a brick hit the ground at the same time?

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Comments

7 Responses to “Design a Solar System”

  1. Aurora Lipper says:

    You should be able to select the bodies using this menu on the right hand side. If you aren’t able to make a selection, please try a different web browser.
    Object Selection

  2. ruthmmartens says:

    I can’t make my own bodies. All it shows is the sun, earth, and moon. Is it just my computer? or is this the way it is supposed to be? I also wondered if it would be ok to do this and submit it as a science fair project. (as long as I document what I do of course.) thank you

  3. Aurora Lipper says:

    Please be sure to download the “Student Worksheet & Exercises”, they guide you through using portions of this simulator. The link is under the video.

  4. do you know how to use it? Because I don’t know how you control the moon and how to change the velocity very well…… (I do know how but it doesn’t show “body 1, body 2, body 3 ect.”)

  5. The Phet simulations are really, really good, and have been used for many years by high school and college physics classes for many years. I’ve updated the link – they have been making more browser-friendly versions of the simulations since so many students use them. The one I’ve substituted here is a limited version of the original, since they have not yet converted over the My Solar System to be HTML5 friendly As soon as they do, I’ll be sure to put the updated link in the experiment.

  6. akyelton20 says:

    Hi Aurora, My son is working on this e-science course. The link to the Simulation says that Flash Sims are no longer supported by “modern browsers.” Therefore he cannot participate in the simulation. Just wanted you to know so that you can update the course material.