# Review Questions: Newton's Laws of Motion Answers

## Multiple Choice Questions

1) A kilogram is a measure of an object's

a) weight
b) force
c) mass
d) gravity
e) center of mass

2) Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much

a) inertia
b) mass
c) volume
d) all of the above
e) none of these

3) Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has the same

a) mass
b) volume
c) weight
d) all of these
e) none of these

4) An object maintains its state of motion because it has

a) mass
b) weight
c) speed
d) acceleration
e) all of these

5) Your weight is

a) actually your mass
b) the gravitational attraction between you and the earth
c) a property of mechanical equilibrium
d) all of these
e) none of these

6) One object has twice as much mass as another object. The first object also has twice as much

a) inertia
b) velocity
c) gravitational acceleration
d) volume
e) all of these

7) Compared to the mass of a certain object on earth, the mass of the same object on the moon is

a) less
b) more
c) the same

8) Strange as it may seen, it is just as hard to accelerate a car on the moon as it is to accelerate the same car on earth. This is because

a) the mass of the car is independent of gravity
b) the weight of the car is independent of gravity
c) ... Nonsense! A car is much more easily accelerated on the moon than on the earth

9) The newton is a unit of

a) force
b) mass
c) density
d) inertia

10) An object weighs 30 N on earth. A second object weighs 30 N on the moon. Which has the greater mass?

a) the one on earth
b) the one on the moon
c) they have the same mass
d) not enough information to say

11) Action and reaction forces comprise the parts of

a) a single interaction
b) two interactions

12) An archer shoots an arrow. Consider the action force to be exerted by the bowstring against the arrow. The reaction to this force is the

a) weight of the arrow
b) air resistance against the arrow
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

13) 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

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 efforts in the player's arms
e) none of these

14) 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 of the ball against the bat
d) grip of the player's hand against the ball
e) none of these

15) A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force against the bat of

a) less than 1000 N
b) more than 1000 N
c) 1000 N

16) As a ball falls, the action force is the pull of the earth's mass on the ball. The reaction force is the

a) air resistance against the ball
b) acceleration of the ball
c) pull of the ball's mass on the earth
d) non-existent in this case
e) none of these

17) A person is attracted toward the center of the earth by a 500-N gravitational force. The force of attraction of the earth toward the person is

a) very very small
b) very very large
c) 500 N

18) Arnold Strong man and Susie small each pull on opposite ends of a massless rope in a tug-of-war. The greater force on the rope is exerted by

a) Arnold
b) Susie
c) both the same

19) The earth pulls on the moon. Similarly the moon pulls on the earth, evidence that the

a) earth and moon are simply pulling on each other
b) earth's and moon's pull comprise an action-reaction pair
c) both of these
d) neither of these

20) The attraction of a person's body toward the earth is called weight. The reaction to this force is

a) the person's body pushing against the 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

21) 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 and every particle in the universe
d) all of these
e) none of these

22) A Mack truck and a Volkswagen traveling at the same speed collide head-on. The impact force is

a) greater on the Volkswagen
b) greater on the Mack
c) the same for both

23) Your friend says 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
c) disagree, for a good punch easily delivers this much force

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

a) greater on the bug
b) greater on the car
c) the same for both

25) 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