Question 1

When a cannonball is fired from a cannon, which undergoes the greater acceleration?

Accepted Answer

A) the cannonball 
B) the recoiling cannon 
C) both the same 
A) the cannonball 
B) the recoiling cannon 
C) both the same

Question 2

An automobile and a golf cart traveling at the same speed collide head-on. The impact force is

Accepted Answer

A) greater on the automobile. 
B) greater on the golf cart. 
C) the same for both. 
A) greater on the automobile. 
B) greater on the golf cart. 
C) the same for both.

Question 3

As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the

Accepted Answer

A) air resistance acting against the ball. 
B) acceleration of the ball. 
C) ball's pull on Earth. 
D) none of the above 
A) air resistance acting against the ball. 
B) acceleration of the ball. 
C) ball's pull on Earth. 
D) none of the above

Question 4

A shoe on an inclined surface barely remains at rest when friction equals the

Accepted Answer

A) weight mg of the shoe. 
B) component of mg perpendicular to the surface. 
C) component of mg parallel to the surface. 
D) none of the above 
A) weight mg of the shoe. 
B) component of mg perpendicular to the surface. 
C) component of mg parallel to the surface. 
D) none of the above

Question 5

A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. The spring exerts the greater force on the

Accepted Answer

A) heavier car. 
B) lighter car. 
C) same on each. 
A) heavier car. 
B) lighter car. 
C) same on each.

Question 6

A car traveling at 100 km/h strikes an unfortunate bug and splatters it. The force of impact is

Accepted Answer

A) greater on the bug. 
B) greater on the car. 
C) the same for both. 
A) greater on the bug. 
B) greater on the car. 
C) the same for both.

Question 7

Nellie's weight and normal force usually have the same magnitude when she stands on a

Accepted Answer

A) horizontal surface. 
B) inclined surface. 
C) either a horizontal or inclined surface. 
A) horizontal surface. 
B) inclined surface. 
C) either a horizontal or inclined surface.

Question 8

Arnold Strongman and Suzie Small each pull very hard on opposite ends of a rope in a tug-of-war. The greater force on the rope is exerted by

Accepted Answer

A) Arnold, of course. 
B) Suzie, surprisingly. 
C) both the same, interestingly. 
A) Arnold, of course. 
B) Suzie, surprisingly. 
C) both the same, interestingly.

Question 9

Nellie tosses a ball upward at an angle. Neglecting air resistance, the horizontal component of the initial velocity

Accepted Answer

A) decreases with time. 
B) remains constant. 
C) increases with time. 
A) decreases with time. 
B) remains constant. 
C) increases with time.

Question 10

When a baseball player bats a ball with a force of 1000 N, the reaction force that the ball exerts against the bat is

Accepted Answer

A) less than 1000 N. 
B) more than 1000 N. 
C) 1000 N. 
D) need more information 
A) less than 1000 N. 
B) more than 1000 N. 
C) 1000 N. 
D) need more information

Question 11

A river 100 m wide flows due south. A boat that goes 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat crosses in

Accepted Answer

A) 50 s. 
B) 100 s. 
C) 141 s. 
D) 200 s. 
A) 50 s. 
B) 100 s. 
C) 141 s. 
D) 200 s.

Question 12

Nellie tosses a ball upward at an angle. Neglecting air resistance, the vertical component of the initial velocity

Accepted Answer

A) decreases with time to reach the top. 
B) remains constant. 
C) increases with time to reach the top. 
A) decreases with time to reach the top. 
B) remains constant. 
C) increases with time to reach the top.

Question 13

Art museums use weaker wires than those used in homes because paintings in museums

Accepted Answer

A) are suspended by pairs of vertical wires. 
B) are usually lighter in weight. 
C) are more firmly attached. 
A) are suspended by pairs of vertical wires. 
B) are usually lighter in weight. 
C) are more firmly attached.

Question 14

To produce an acceleration to a system there

Accepted Answer

A) must be a net force on the system. 
B) may or may not be a net force on the system. 
C) must be acceleration outside the system also. 
A) must be a net force on the system. 
B) may or may not be a net force on the system. 
C) must be acceleration outside the system also.

Question 15

When Monkey Mo is suspended at rest by holding a rope with one hand and the side of his cage with the other, all the force vectors that act on him

Accepted Answer

A) have equal magnitudes. 
B) cancel except for his weight vector, mg. 
C) have a vector sum of zero. 
A) have equal magnitudes. 
B) cancel except for his weight vector, mg. 
C) have a vector sum of zero.

Question 16

When you walk, you push on the floor to the left and the floor

Accepted Answer

A) also pushes on you to the left. 
B) pushes you to the right. 
C) both of these simultaneously. 
D) can only wish it could push on you. 
E) none of the above 
A) also pushes on you to the left. 
B) pushes you to the right. 
C) both of these simultaneously. 
D) can only wish it could push on you. 
E) none of the above

Question 17

A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is the

Accepted Answer

A) air resistance on the ball. 
B) weight of the ball. 
C) force that the ball exerts on the bat. 
D) grip of the player's hand against the ball. 
E) weight of the bat. 
A) air resistance on the ball. 
B) weight of the ball. 
C) force that the ball exerts on the bat. 
D) grip of the player's hand against the ball. 
E) weight of the bat.

Question 18

Neglecting air resistance, once a tossed ball leaves your hand

Accepted Answer

A) no further forces act on it. 
B) only the force due to gravity acts on it. 
C) inertia becomes the force acting on it. 
D) your tossing force remains while the ball goes upward. 
E) your tossing force remains until it comes to a stop. 
A) no further forces act on it. 
B) only the force due to gravity acts on it. 
C) inertia becomes the force acting on it. 
D) your tossing force remains while the ball goes upward. 
E) your tossing force remains until it comes to a stop.

Question 19

The attraction between Earth and Sydney is equal to her weight. The reaction to Earth's pull on Sydney is

Accepted Answer

A) Sydney pushing against Earth's surface. 
B) the support of Earth's surface on Sydney. 
C) Sydney's pull on Earth. 
D) none of the above 
A) Sydney pushing against Earth's surface. 
B) the support of Earth's surface on Sydney. 
C) Sydney's pull on Earth. 
D) none of the above

Question 20

As a ball bounces from a floor, its acceleration off the floor between bounces is

Accepted Answer

A) significantly less than g. 
B) g. 
C) slightly more than g. 
D) significantly more than g. 
A) significantly less than g. 
B) g. 
C) slightly more than g. 
D) significantly more than g.

Exam 5: Newtons Third Law of Motion: Action and Reaction

When a cannonball is fired from a cannon, which undergoes the greater acceleration?

An automobile and a golf cart traveling at the same speed collide head-on. The impact force is

As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the

A shoe on an inclined surface barely remains at rest when friction equals the

A pair of toy freight cars, one twice the mass of the other, fly apart when a compressed spring that joins them is released. The spring exerts the greater force on the

A car traveling at 100 km/h strikes an unfortunate bug and splatters it. The force of impact is

Nellie's weight and normal force usually have the same magnitude when she stands on a

Arnold Strongman and Suzie Small each pull very hard on opposite ends of a rope in a tug-of-war. The greater force on the rope is exerted by

Nellie tosses a ball upward at an angle. Neglecting air resistance, the horizontal component of the initial velocity

When a baseball player bats a ball with a force of 1000 N, the reaction force that the ball exerts against the bat is

A river 100 m wide flows due south. A boat that goes 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat crosses in

Nellie tosses a ball upward at an angle. Neglecting air resistance, the vertical component of the initial velocity

Art museums use weaker wires than those used in homes because paintings in museums

To produce an acceleration to a system there

When Monkey Mo is suspended at rest by holding a rope with one hand and the side of his cage with the other, all the force vectors that act on him

When you walk, you push on the floor to the left and the floor

A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is the

Neglecting air resistance, once a tossed ball leaves your hand

The attraction between Earth and Sydney is equal to her weight. The reaction to Earth's pull on Sydney is

As a ball bounces from a floor, its acceleration off the floor between bounces is

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