Question 1

A ball that gains speed as it rolls down a hill experiences a

Accepted Answer

A) net torque. 
B) net force. 
C) both of these 
D) neither of these 
A) net torque. 
B) net force. 
C) both of these 
D) neither of these C

Question 2

Which horse moves faster in m/s on a merry-go-round?

Accepted Answer

A) one near inner rail 
B) one near outer rail 
C) both move at the same speed in m/s. 
A) one near inner rail 
B) one near outer rail 
C) both move at the same speed in m/s. B

Question 3

The famous Leaning Tower of Pisa doesn't topple over because its center of gravity is

Accepted Answer

A) relatively low for such a tall building. 
B) stabilized by its structure. 
C) displaced from its center. 
D) above a place of support. 
E) in the same place as its center of mass. 
A) relatively low for such a tall building. 
B) stabilized by its structure. 
C) displaced from its center. 
D) above a place of support. 
E) in the same place as its center of mass. D

Question 4

A coin and a ring roll down an incline at the same time. The one to first reach the bottom is the

Accepted Answer

A) ring. 
B) coin. 
C) both reach the bottom at the same time 
A) ring. 
B) coin. 
C) both reach the bottom at the same time

Question 5

A tightrope walker more easily balances on a tight wire if her pole

Accepted Answer

A) is held high. 
B) droops. 
C) is short but heavy. 
A) is held high. 
B) droops. 
C) is short but heavy.

Question 6

A ball gains speed while rolling down a hill due mainly to

Accepted Answer

A) its rotational inertia. 
B) its angular acceleration. 
C) a balanced torque. 
D) an unbalanced torque. 
A) its rotational inertia. 
B) its angular acceleration. 
C) a balanced torque. 
D) an unbalanced torque.

Question 7

On a balanced seesaw, a boy three times as heavy as his partner sits

Accepted Answer

A) less than 1/3 the distance from the fulcrum. 
B) 1/3 the distance from the fulcrum. 
C) more than 1/3 the distance from the fulcrum. 
A) less than 1/3 the distance from the fulcrum. 
B) 1/3 the distance from the fulcrum. 
C) more than 1/3 the distance from the fulcrum.

Question 8

Centrifugal forces are an apparent reality to observers in a reference frame that is

Accepted Answer

A) moving at constant velocity. 
B) an inertial reference frame. 
C) at rest. 
D) rotating. 
E) none of the above 
A) moving at constant velocity. 
B) an inertial reference frame. 
C) at rest. 
D) rotating. 
E) none of the above

Question 9

A swimming area in a rotating space habitat is located in a region of 1/4 g. If a diver can jump 1 m high in a 1-g region, how high can the same diver jump in the swimming area?

Accepted Answer

A) 1 m 
B) 2 m 
C) 4 m 
D) 16 m 
E) more than 16 m 
A) 1 m 
B) 2 m 
C) 4 m 
D) 16 m 
E) more than 16 m

Question 10

The center of mass of a human body is located at a point that

Accepted Answer

A) is fixed, but different for different people. 
B) is always directly behind the belly button. 
C) changes as a person bends over. 
D) none of the above 
A) is fixed, but different for different people. 
B) is always directly behind the belly button. 
C) changes as a person bends over. 
D) none of the above

Question 11

A vertically-held sledge hammer is easier to balance when the heavier end is

Accepted Answer

A) on your hand. 
B) at the top, away from your hand. 
C) same either way 
A) on your hand. 
B) at the top, away from your hand. 
C) same either way

Question 12

A flywheel's diameter is twice that of another of the same shape and mass. Rotational inertia of the larger flywheel is

Accepted Answer

A) two times greater. 
B) four times greater. 
C) the same as the other's. 
D) half. 
A) two times greater. 
B) four times greater. 
C) the same as the other's. 
D) half.

Question 13

As you crawl toward the edge of a large freely-rotating horizontal turntable in a carnival funhouse, the angular momentum of you and the turntable

Accepted Answer

A) decreases. 
B) increases. 
C) remains the same, but the revolutions per minute decrease. 
D) decreases in direct proportion to your decrease in revolutions per minute. 
E) none of these 
A) decreases. 
B) increases. 
C) remains the same, but the revolutions per minute decrease. 
D) decreases in direct proportion to your decrease in revolutions per minute. 
E) none of these

Question 14

If you're on a Ferris wheel at a carnival, seated 10 m from the Ferris wheel's axis that makes a complete rotation each minute, your linear speed is

Accepted Answer

A) 10 m/min. 
B) 31.4 m/min. 
C) 62.8 m/min. 
D) 100 m/min. 
E) need more information 
A) 10 m/min. 
B) 31.4 m/min. 
C) 62.8 m/min. 
D) 100 m/min. 
E) need more information

Question 15

Your pet hamster sits on a record player that has constant angular speed. If the hamster moves to a point twice as far from the center, then its linear speed

Accepted Answer

A) doubles. 
B) halves. 
C) remains the same. 
A) doubles. 
B) halves. 
C) remains the same.

Question 16

The bob of a conical pendulum swings in a

Accepted Answer

A) to-and-fro path. 
B) circular path. 
C) chaotic path. 
A) to-and-fro path. 
B) circular path. 
C) chaotic path.

Question 17

As the polar icecaps melt, the resulting water spreads over the entire Earth. This new mass distribution tends to make the length of a day

Accepted Answer

A) longer. 
B) shorter. 
C) none of these 
A) longer. 
B) shorter. 
C) none of these

Question 18

If Alex wishes to rotate his skateboard, then he must apply a

Accepted Answer

A) torque. 
B) rotational maneuver. 
C) pause before bearing down on the board. 
A) torque. 
B) rotational maneuver. 
C) pause before bearing down on the board.

Question 19

A difference between linear momentum and angular momentum involves

Accepted Answer

A) a radial distance. 
B) two types of speed. 
C) both of these 
D) neither of these 
A) a radial distance. 
B) two types of speed. 
C) both of these 
D) neither of these

Question 20

When a twirling ice skater brings her arms inward, her rotational speed

Accepted Answer

A) decreases. 
B) remains the same. 
C) increases. 
A) decreases. 
B) remains the same. 
C) increases.

Exam 8: Rotational Motion

A ball that gains speed as it rolls down a hill experiences a

Which horse moves faster in m/s on a merry-go-round?

The famous Leaning Tower of Pisa doesn't topple over because its center of gravity is

A coin and a ring roll down an incline at the same time. The one to first reach the bottom is the

A tightrope walker more easily balances on a tight wire if her pole

A ball gains speed while rolling down a hill due mainly to

On a balanced seesaw, a boy three times as heavy as his partner sits

Centrifugal forces are an apparent reality to observers in a reference frame that is

A swimming area in a rotating space habitat is located in a region of 1/4 g. If a diver can jump 1 m high in a 1-g region, how high can the same diver jump in the swimming area?

The center of mass of a human body is located at a point that

A vertically-held sledge hammer is easier to balance when the heavier end is

A flywheel's diameter is twice that of another of the same shape and mass. Rotational inertia of the larger flywheel is

As you crawl toward the edge of a large freely-rotating horizontal turntable in a carnival funhouse, the angular momentum of you and the turntable

If you're on a Ferris wheel at a carnival, seated 10 m from the Ferris wheel's axis that makes a complete rotation each minute, your linear speed is

Your pet hamster sits on a record player that has constant angular speed. If the hamster moves to a point twice as far from the center, then its linear speed

The bob of a conical pendulum swings in a

As the polar icecaps melt, the resulting water spreads over the entire Earth. This new mass distribution tends to make the length of a day

If Alex wishes to rotate his skateboard, then he must apply a

A difference between linear momentum and angular momentum involves

When a twirling ice skater brings her arms inward, her rotational speed

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