Circular Motion MCQ Quiz - Multiple Choice Questions & Answers Page 2

11. A rock attached to a string swings in a vertical circle. At the highest point,

1. no forces act on the rock.
2. only one force acts on the rock.
3. two forces act on the rock and their resultant is zero.
4. two forces act on the rock and their resultant is not zero.

12. A satellite moving in a circular orbit around Earth and maintaining a constant speed will experience a

1. changing gravitational force towards Earth.
2. net gravitational force towards Earth.
3. changing acceleration away from Earth.
4. net acceleration away from Earth.

13. A small car is being driven in a circular path at constant speed on a horizontal surface. What is the direction of the frictional force that keeps the car from skidding as it travels along this path?

1. opposite the direction of the velocity of the car
2. in the same direction as the velocity of the car
3. toward the center of the circle
4. outward from the center of the circle

14. A stone is tied to one end of a string. Holding the other end, the string is whirled in a horizontal plane with progressively increasing speed. It breaks at some speed because

1. Gravitational forces of the earth are greater than the tension in the string.
2. The required centripetal force is greater than the tension sustained by the string.
3. The required centripetal force is less than the tension in the string.
4. The centripetal force is greater than the weight of the stone.

15. A tin can whirled on the end of a string moves ina circle because

1. the can continually pulls on the string.
2. once the can starts moving, that is its natural tendency.
3. there is a force on the can pulling it outward.
4. there is an inward force acting on the can.

16. After closing a deal with a client, Kent leans back in his swivel chair and spins around with a frequency of 0.8 Hz. What is the period of Kents spin?

1. 0.8 s
2. 2 Hz
3. 1.25 s
4. 1 Hz

17. An airplane is taking a turn in a horizontal plane

1. its remains horizontal
2. it inclines inward
3. it inclines outward
4. its wings become vertical

18. An object moves in a circle with a period of 0.025 hours. What is its frequency in Hz?

1. 90 Hz
2. 263 Hz
3. 0.1 Hz
4. 0.01 Hz

19. Applying a force to an object perpendicular to its direction of motion will cause the object to

1. change speed but not direction
2. change direction but not speed
3. change the magnitude of its acceleration
4. not change its speed or direction

20. Decreasing the mass of an object on a circular path but keeping its velocity and radius constant

1. increases the centripetal force on the object
2. decreases the centripetal force on the object
3. does not affect the centripetal force on the object
4. depends on the specific situation