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Question

1. When an object experiences uniform circular motion, the direction of the acceleration is

A) in the same direction as the velocity vector.

B) in the opposite direction of the velocity vector.

C) is directed toward the center of the circular path.

D) is directed away from the center of the circular path.

2. If you spin a rock on the end of a string in a circular path and the string suddenly breaks, the

rock will

A) spiral away from your hand

B) fly directly away from you.

C) fly directly toward you

D) fly off tangent to its circular path

3. An object travels in a circular path of radius r at a constant speed v. What happens to the

object’s acceleration if the radius is doubled and the speed stays unchanged?

A) It doubles

B) It quadruples

C) It is cut to a half

D) It is cut to a quarter

5. An object rotates with a period of 10 s. How many revolutions will it make in 15 s?

A) 0.67 rev

B) 105 rev

C) 25 rev

D) 1.5 rev

Answer 1

1) C

2) D

3) C (a=v²/r)

5) D