This experiment is for advanced students. Circular motion is a little different from straight-line motion in a few different ways. Objects that move in circles are roller coasters in a loop, satellites in orbit, DVDs spinning in a player, kids on a merry go round, solar systems rotating in the galaxy, making a left turn in your car, water through a coiled hose, and so much more.

Velocity is always tangent to the circle in the direction of the motion, and acceleration is always directed radially inward. Because of these two things, the acceleration that arises from traveling in a circle is called centripetal acceleration (a word created by Sir Isaac Newton). There’s no direct relationship between the acceleration and velocity vectors for a moving particle.

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10 Responses to “Circular Motion”

  1. elaineeng208 says:

    Why does one ball lift up ten balls?

  2. Susanne Gentry says:

    This link is supposed to lead me to Apologia Physical Science exp. 14:1 “Sound waves travelling through a medium” but it is centripetal force instead.

  3. Ingrid Cordano says:

    It’s so cool!

  4. Katie Barr says:

    I feel like a magician thanks Aurora!

  5. Katie Barr says:

    This was such a simple one but it was so cool!

  6. Oh, no! There was a typo in the video… sorry about that! We’ll edit the video so it’s correct. My apologies, and thanks for your eagle eye!

  7. Stephanie Baughman says:

    My student would like an explanation of where the 20 came from in the equation. We got 10 but couldn’t figure out if we missed a step that would get us from the 10 to the 20. Thanks.

  8. Laura Swick says:

    thanks for giving us the ants

  9. Wow that’s fantastic! This is meant for kids in the middle and high school level, so you have plenty of time.

  10. Patricia Gulati says:

    Just quick … I was able to explain it to my son but he is in Grade 4. The math was a little more complicated than he can do yet but I was able to explain it in simple terms. Of do they have to know the forumula? What grade should they have to know this? Thank you