Peoples Physics Concepts

(Marvins-Underground-K-12) #1

http://www.ck12.org Chapter 5. Centripetal Forces


a. Straight upwards
b. Straight downwards
c. Directly right
d. Directly left
e. It will stop


  1. A ball is spiraling outward in the tube shown to the right. Which way will the ball go after it leaves the tube?


a. Towards the top of the page
b. Towards the bottom of the page
c. Continue spiraling outward in the clockwise direction
d. Continue in a circle with the radius equal to that of the spiral as it leaves the tube
e. None of the above


  1. Explain using Newton’s Second Law why an object moving in a circle must experience a net force towards
    the center of the circle.

  2. Using the known distance Earth is from the sun, calculate the speed that Earth is moving through space in
    relation to the sun.

  3. Using the known distance the moon is from Eath, calculate the speed that the moon is moving through space
    in relation to Earth.

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