(Questions 1 - 4) A 1.00 × 10^3-kilogram car is driven clockwise around a flat circular track of radius 25.0 meters. The speed of the car is a constant 5.00 meters per second. If the circular track were to suddenly become frictionless at the instant shown, the car's direction of travel will be- toward N
- toward E
- toward W
- a clockwise spiral

- At the instant shown in the diagram, the car’s centripetal acceleration is directed
- clockwise
- toward N
- toward E
- toward W

- Which factor, when doubled, would produce the greatest change in the centripetal force acting on the car?
- velocity of the car
- radius of the track
- mass of the car
- weight of the car

- What minimum friction force must exist between the tires and the road to prevent the car from skidding as it rounds the curve?
- 1.00 × 10^3 N
- 1.25 × 10^5 N
- 9.80 × 10^4 N
- 5.00 × 10^3 N

(5-7) Base your answer to the following question on the information and diagram below. An athlete in a hammer-throw event swings a 7.0-kilogram hammer in a horizontal circle at a constant speed of 12 meter per second. The radius of the hammer's path is 2.0 meters. At the position shown, the centripetal force acting on the hammer is directed toward point- D
- B
- A
- C

- What is the magnitude of the centripetal acceleration of the hammer?
- 72 m/s^2
- 500 m/s^2
- 6 m/s^2
- 24 m/s^2

- If the hammer is released at the position shown, it will travel toward point
- A
- C
- B
- D

(8 - 10) Base your answer to the following question on the diagram below which shows a 2.0-kilogram cart traveling at a constant speed in a horizontal circle of radius 3.0 meters. The magnitude of the centripetal force of the cart is 24 Newtons. In the position shown, the acceleration of the cart is- 12 m/s2 directed toward point A
- 8.0 m/s2 directed toward point D
- 12 m/s2 directed toward point D
- 8.0 m/s2 directed toward point A

- Which statement correctly describes the direction of the cart's velocity and centripetal force in the position shown?
- Velocity is directed toward point C, and the centripetal force is directed toward point A.
- Velocity is directed toward point B, and the centripetal force is directed toward point D.
- Velocity is directed toward point C, and the centripetal force is directed toward point D.
- Velocity is directed toward point B, and the centripetal force is directed toward point A.

- What is the speed of the cart?
- 36 m/s
- 16 m/s
- 6.0 m/s
- 4.0 m/s