Uniform Circular Motion Quiz Answers

1. Knowing what you know about uniform circular motion, and physics, when a NASCAR races around a circular track at 160 mph what keeps it from flying off the sides of the track?
   
   Gravitational Force.
   Centripetal Force.
   Frictional Force. (It is the force that keeps things from sliding around)
   Electromagnetic Force.
   Strong Nuclear Force.
   
   
2. You attached a rock to a rope, and were swinging it around in a circle very quickly. If you could keep the speed of the rock constant as you pulled the rope in, what would happen to the force transmitted to you by the rope?
   
   Increase inversely with the distance. (The force necessary to keep an object in uniform circular motion is proportional to V²/r, and the distance is decreasing)
   Decrease inversely with the distance.
   Increase as the square of the distance.
   Decrease as the square of the distance.
   Remain the Same.
   
   
3. While playing on the International Space Station (ISS), so you can neglect the effects of gravity, you attached a rock to a rope, and were swinging it around in a circle very quickly, when the rope suddenly broke. What did the path of the rock look like before it hit the ISS window a few feet away?
   
   An arc.
   A parabola.
   A hyperbola.
   A line. (Without a force to keep it moving in a circle, the rock will continue on a straight path)
   It dropped to the ground (and didn't hit the window).

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