# Chapter 8. Rotational Motion

Angular displacement is usually express in units of
A) meters.
B) radians.
C) revolutions.
D) arcs.
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A boy and a girl are riding on a merry-go-round which is turning at a constant rate. The boy
is near the outer edge, and the girl is closer to the center. Who has the greater angular
displacement?
A) the boy
B) the girl
C) Both have the same non-zero angular displacement.
D) Both have zero angular displacement.
A boy and a girl are riding on a merry-go-round which is turning at a constant rate. The boy
is near the outer edge, and the girl is closer to the center. Who has the greater linear speed?
A) the boy
B) the girl
C) Both have the same non-zero translational velocity.
D) Both have zero translational velocity.
A boy and a girl are riding a merry-go-round which is turning at a constant rate. The boy is
near the outer edge, while the girl is closer to the center. Who has the greater centripetal
acceleration?
A) the boy
B) the girl
C) Both have the same non-zero centripetal acceleration.
D) Both have zero centripetal acceleration.
A boy and a girl are riding a merry-go-round which is turning at a constant rate. The boy is
near the outer edge, while the girl is closer to the center. Who has the greater tangential
acceleration?
A) the boy
B) the girl
C) Both have the same non-zero tangential acceleration.
D) Both have zero tangential acceleration.
Consider a rigid body that is rotating. Which of the following is an accurate statement?
A) Its center of rotation is its center of gravity.
B) All points on the body are moving with the same angular velocity.
C) All points on the body are moving with the same linear velocity.
D) Its center of rotation is at rest, i.e., not moving.