# Chapter 5: Newton's Third Law Of Motion, Action And Reaction

22 Questions | Attempts: 877
Share  Settings  • 1.
For an action force, there must be a reaction force that
• A.

Always acts in the same direction

• B.

Is slightly smaller in magnitude than the action force

• C.

Is slightly larger in amplitude than the action force

• D.

Is exactly equal in magnitude

• 2.
An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the
• A.

Combined weight of the arrow and bowstring

• B.

Air resistance against the bow

• C.

Friction of the ground against the archer's feet

• D.

Grip of the archer's hand on the bow

• E.

Arrow's push against the bowstring

• 3.
A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the
• A.

Player's grip on the glove

• B.

Force the glove exerts on the ball

• C.

Friction of the ground against the player's shoes

• D.

Muscular effort in the player's arms

• E.

None of these

• 4.
A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the
• 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

• 5.
A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is
• A.

Less than 1000 N

• B.

More than 1000 N

• C.

1000 N

• D.

Impossible to determine

• 6.
As a ball falls, the action force is the pull of Earth on the ball. The reaction force is the
• A.

Air resistance acting against the ball

• B.

Acceleration of the ball

• C.

Pull of the ball's mass on the Earth

• D.

None of these

• 7.
A person is attracted toward the center of Earth by a 500-N gravitational force. The Earth is attracted toward the person with a force of
• A.

Zero

• B.

250 N

• C.

500 N

• D.

1000 N

• 8.
A karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during this event is
• A.

Zero

• B.

1500 N

• C.

3000 N

• D.

6000 N

• 9.
Arnold Strongman and Suzie Small each pull very hard on opposite ends of a massless rope in a tug-of-war. The greater force on the rope is exerted by
• A.

Arnold, of course

• B.

Suzie, surprisingly

• C.

Both the same, interestingly enough

• 10.
Earth pulls on the moon. Similarly the moon pulls on Earth, evidence that
• A.

These two pulls comprise an action-reaction pair

• B.

Earth is larger so its pull is larger

• C.

The moon is smaller so its pull is smaller

• D.

Larger objects pull harder

• 11.
The attraction of a person's body toward Earth is called weight. The reaction to this force is
• A.

The person's body pushing against Earth's surface

• B.

The Earth's surface pushing against the person's body

• C.

The person's body pulling on the Earth

• D.

None of these

• 12.
A skydiver falls towards the Earth. The attraction of the Earth on the diver pulls the diver down. What is the reaction to this force?
• A.

Air resistance the diver encounters while falling

• B.

Water resistance that will soon act upward on the diver

• C.

The attraction to the planets, stars, and every particle in the universe

• D.

All of these

• E.

None of these

• 13.
A automobile and a baby carriage traveling at the same speed collide head-on. The impact force is
• A.

Greater on the automobile

• B.

Greater on the baby carriage

• C.

The same for both

• 14.
A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the
• A.

Volkswagen

• B.

Mack truck

• C.

Same for both

• 15.
A car traveling at 100 km/hr strikes an unfortunate bug and splatters it. The force of impact is
• A.

Greater on the bug

• B.

Greater on the car

• C.

The same for both

• 16.
Your friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair – no wall, no tricks. You
• A.

Agree that it can't be done

• B.

• C.

Disagree, for a good punch easily delivers this much force

• 17.
A piece of rope is pulled by two people in a tug-of-war. Each pulls with 400 N of force. What is the tension in the rope?
• A.

Zero

• B.

400 N

• C.

600 N

• D.

800 N

• E.

None of these

• 18.
Two people, one twice as massive as the other, attempt a tug-of-war with 12 meters of massless rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of
• A.

3 m

• B.

4 m

• C.

6 m

• D.

0 m

• 19.
A bird sitting on the limb of a tree is moving about 30 km/s with respect to the sun. If the bird takes 1 second to drop down to a worm below, the worm would be 30 km downrange from the bird when it reached the ground. This faulty reasoning is best countered with Newton's
• A.

First law

• B.

Second law

• C.

Third law

• D.

Law of gravitation

• E.

None of these

• 20.
The force exerted on the tires of a car to directly accelerate it along a road is exerted by the
• A.

Engine

• B.

Tires

• C.

Air

• D.

• E.

None of these

• 21.
A vehicle that weighs 4000 N on the surface of the Earth is travelling in outer space at a speed of 200 m/s. The smallest constant force that must be applied to stop it in 20 seconds is
• A.

20 N

• B.

40 N

• C.

400 N

• D.

4000 N

• E.

More than 4000 N

• 22.
A vehicle that weights 400 N on the surface of the Earth is traveling in outer space at a speed of 400 m/s . It can be stopped by applying a constant force of 20 N for
• A.

2 seconds

• B.

4 seconds

• C.

80 seconds

• D.

400 seconds

• E.

800 seconds

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