Uniform Circular Motion

1. Uniform Circular Motion September 30

2. 60 65 0 0 In the game of tetherball, the struck ball whirls around a pole. In what direction does the net force on the ball point? • Toward the top of the pole • Toward the ground • Along the horizontal component of the tension • Along the vertical component of the tension • Tangent to the circle

3. 60 5 0 0 You are a passenger in a car, not wearing a seat belt. The car makes a sharp left turn. From your perspective in the car, what do you feel is happening to you? • You are thrown to the right. • You feel no particular change. • You are thrown to the left. • You are thrown toward the ceiling. • You are thrown toward the floor.

4. 60 5 0 0 During that sharp left turn, you found yourself hitting the passenger door. What is the correct description of what is actually happening? • Centrifugal force is pushing into the door. • The door is pushing you to the left. • Both of the above. • Neither of the above.

6. 60 5 0 0 You drive your dad’s car too fast around a curve and the car starts to skid. What is the correct description of this situation? • The car’s engine is not strong enough to keep the car from being pushed out. • Friction between the tires and the road is not enough to push the car around curve. • The car is too heavy to make the curve. • None of the above.

7. 60 5 0 0 You’re on a Ferris wheel moving in a vertical circle. When the Ferris wheel is at rest, the normal force N exerted by your seat is equal to your weight mg. How does N change at the top of the Ferris wheel when you are in motion? • FN remains equal to mg. • FN is smaller than mg. • FN is bigger than mg. • None of the above