Question 1

If you place a pipe over the end of a wrench when trying to rotate a stubborn bolt, effectively making the wrench handle twice as long, you'll multiply the torque by

Accepted Answer

A) two. 
B) four. 
C) eight. 
A) two. 
B) four. 
C) eight.

Question 2

You can safely stand on the overhanging end of a heavy plank that rests on a table. How much overhang depends on your mass and the mass of the plank. If you can stand on the end of a plank that overhangs the edge of the supporting table 1/5 its total length, how massive is the plank compared to your mass?

Accepted Answer

A) 1/3 
B) the same 
C) 2/3 
D) 1 and 1/3 times 
E) more than 1 and 1/3 times 
A) 1/3 
B) the same 
C) 2/3 
D) 1 and 1/3 times 
E) more than 1 and 1/3 times

Question 3

A ring, a disk, and a solid sphere begin rolling down a hill together. Which reaches the bottom first?

Accepted Answer

A) ring 
B) disk 
C) sphere 
D) all reach the bottom at the same time 
E) need more information 
A) ring 
B) disk 
C) sphere 
D) all reach the bottom at the same time 
E) need more information

Question 4

The long, heavy tail of a spider monkey enables the monkey to easily vary its

Accepted Answer

A) weight. 
B) momentum. 
C) inertia. 
D) center of gravity. 
E) none of the above 
A) weight. 
B) momentum. 
C) inertia. 
D) center of gravity. 
E) none of the above

Question 5

If the planet Jupiter underwent gravitational collapse, its rate of rotation about its axis would

Accepted Answer

A) decrease. 
B) increase. 
C) stay the same. 
D) need more information 
A) decrease. 
B) increase. 
C) stay the same. 
D) need more information

Question 6

Horses with the greatest linear speed on a merry-go-round are located

Accepted Answer

A) near the center. 
B) near the outside. 
C) anywhere, because they all move at the same speed. 
A) near the center. 
B) near the outside. 
C) anywhere, because they all move at the same speed.

Question 7

You can safely stand on the overhanging end of a heavy plank that rests on a table. How much overhang depends on your mass and the plank's mass. If you can stand on the end of a plank that overhangs the edge of the supporting table 1/4 its total length, how massive is the plank compared to your mass?

Accepted Answer

A) 1/2 
B) the same 
C) 1 and 1/2 times 
D) twice 
E) 4 times 
A) 1/2 
B) the same 
C) 1 and 1/2 times 
D) twice 
E) 4 times

Question 8

An industrial flywheel has a greater rotational inertia when most of its mass is

Accepted Answer

A) nearer the rim. 
B) nearer the axis. 
C) uniformly spread out as in a disk. 
A) nearer the rim. 
B) nearer the axis. 
C) uniformly spread out as in a disk.

Question 9

The rotational inertia of a pencil is greatest about an axis

Accepted Answer

A) along its length, where the lead is. 
B) about its midpoint, like a propeller. 
C) about its end, like a pendulum. 
A) along its length, where the lead is. 
B) about its midpoint, like a propeller. 
C) about its end, like a pendulum.

Question 10

Centripetal force does no work on a circularly-moving object because

Accepted Answer

A) no change in energy occurs. 
B) rotational energy transfers to kinetic energy. 
C) centripetal force has no component in the direction of motion. 
D) none of the above. 
A) no change in energy occurs. 
B) rotational energy transfers to kinetic energy. 
C) centripetal force has no component in the direction of motion. 
D) none of the above.

Question 11

The main reason a person weighs less at the equator than at the poles involves the

Accepted Answer

A) spin of the Earth. 
B) influence of the Sun, Moon, and all the planets. 
C) law of action and reaction. 
A) spin of the Earth. 
B) influence of the Sun, Moon, and all the planets. 
C) law of action and reaction.

Question 12

Two people are balanced on a seesaw. If one person leans inward toward the center of the seesaw, that person's end of the seesaw tends to

Accepted Answer

A) rise. 
B) fall. 
C) stay at the same level. 
D) need more information 
A) rise. 
B) fall. 
C) stay at the same level. 
D) need more information

Question 13

To kick a football so it won't topple end over end, kick it so the force of impact extends

Accepted Answer

A) above its center of gravity. 
B) through its center of gravity. 
C) below its center of gravity. 
A) above its center of gravity. 
B) through its center of gravity. 
C) below its center of gravity.

Question 14

The rotational inertia of your leg is greater when your leg is

Accepted Answer

A) straight. 
B) bent. 
C) same either way 
A) straight. 
B) bent. 
C) same either way

Question 15

If Earth had a pair of identical moons on opposite sides of the same circular orbit, the center of gravity of the double-moon-Earth system would be

Accepted Answer

A) inside the Earth, but off center. 
B) at the center of the Earth. 
C) outside the Earth, but within the orbital path of the moons. 
D) outside the Earth, but beyond the orbital path of the moons. 
A) inside the Earth, but off center. 
B) at the center of the Earth. 
C) outside the Earth, but within the orbital path of the moons. 
D) outside the Earth, but beyond the orbital path of the moons.

Question 16

A ring and a disk both at rest roll down a hill together. Which rolls slower?

Accepted Answer

A) ring 
B) disk 
C) depends on the masses 
D) both roll at the same speed 
E) need more information 
A) ring 
B) disk 
C) depends on the masses 
D) both roll at the same speed 
E) need more information

Question 17

Toss a baseball bat into the air and it wobbles about its

Accepted Answer

A) geometrical center. 
B) center of mass. 
C) heavier end. 
A) geometrical center. 
B) center of mass. 
C) heavier end.

Question 18

Strictly speaking, to weigh less in the Northern Hemisphere, you should move to a location farther

Accepted Answer

A) north (toward the pole). 
B) south (toward the equator). 
C) east. 
D) west. 
A) north (toward the pole). 
B) south (toward the equator). 
C) east. 
D) west.

Question 19

The circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second then its linear speed is

Accepted Answer

A) 1 m/s. 
B) 2 m/s. 
C) 3 m/s. 
D) 3)14 m/s. 
E) 6.28 m/s. 
A) 1 m/s. 
B) 2 m/s. 
C) 3 m/s. 
D) 3)14 m/s. 
E) 6.28 m/s.

Question 20

The tapered shape of the wheel rims that ride on railroad tracks allows opposite wheels to

Accepted Answer

A) in effect, vary their diameters. 
B) travel at different linear speeds for the same rotational speed. 
C) both of these 
D) none of these 
A) in effect, vary their diameters. 
B) travel at different linear speeds for the same rotational speed. 
C) both of these 
D) none of these

Exam 8: Rotational Motion

If you place a pipe over the end of a wrench when trying to rotate a stubborn bolt, effectively making the wrench handle twice as long, you'll multiply the torque by

A ring, a disk, and a solid sphere begin rolling down a hill together. Which reaches the bottom first?

The long, heavy tail of a spider monkey enables the monkey to easily vary its

If the planet Jupiter underwent gravitational collapse, its rate of rotation about its axis would

Horses with the greatest linear speed on a merry-go-round are located

An industrial flywheel has a greater rotational inertia when most of its mass is

The rotational inertia of a pencil is greatest about an axis

Centripetal force does no work on a circularly-moving object because

The main reason a person weighs less at the equator than at the poles involves the

Two people are balanced on a seesaw. If one person leans inward toward the center of the seesaw, that person's end of the seesaw tends to

To kick a football so it won't topple end over end, kick it so the force of impact extends

The rotational inertia of your leg is greater when your leg is

If Earth had a pair of identical moons on opposite sides of the same circular orbit, the center of gravity of the double-moon-Earth system would be

A ring and a disk both at rest roll down a hill together. Which rolls slower?

Toss a baseball bat into the air and it wobbles about its

Strictly speaking, to weigh less in the Northern Hemisphere, you should move to a location farther

The circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second then its linear speed is

The tapered shape of the wheel rims that ride on railroad tracks allows opposite wheels to

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