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Momentum Unit Review

Total questions: 70

Worksheet time: 4hrs 30mins

Name
Class
Date
1.
Which of the following has the least amount of momentum?
a)
An ant walking along the ground
b)
An ant at rest
c)
An elephant walking
d)
An elephant running
2.
Momentum depends on an object's mass and its ____________.
a)
Inertia
b)
Velocity
c)
Potential energy
d)
Height
3.
Momentum is often referred to as "__________ in motion."
a)
Inertia
b)
Matter
c)
Volume
d)
Force
4.
Both mass and velocity are _______________ proportional to momentum.
a)
Directly
b)
Inversely
5.
To change the momentum of an object, a/an _________________ must be applied.
a)
Impulse
b)
Force
6.
An object that bounces has a _____ change in momentum than an identical object that doesn't bounce.
a)
Smaller
b)
Larger
7.
To maximize the change in momentum of an object, a _____ force should be applied over a _____ time.
a)
Large; long
b)
Large; small
c)
Small; long
d)
Small; short
8.
The impulse acting on an object is always equal to its change in _____.
a)
Momentum
b)
Energy
c)
Position
d)
Velocity
9.
The impulse-momentum relationship is used by engineers to save lives.  Air bags, seat belts, and safer walls (Nascar) depend on the ______ relationship between time to stop and force.
a)
Direct
b)
Inverse
10.
In both elastic and inelastic collisions, momentum ____________________.
a)
is conserved
b)
is lost
c)
is gained
d)
is changed into inertia
11.
The total momentum before a collision is _________ the total momentum after a collision.
a)
equal to 
b)
less than 
c)
more than
d)
It depends on the type of collision
12.
As a general rule of thumb, if a colliding objects are not deformed and are separate after the collision, it is an _____ collision.
a)
Elastic
b)
Inelastic
13.
As you are walking along the sidewalk you step on a piece of gum that sticks to your shoe.  This is an example of an _____ collision.
a)
Elastic
b)
Inelastic
14.
Due to friction, a purely _____ collision is impossible outside of a laboratory setting.
a)
Elastic
b)
Inelastic
15.
Bungee cords are made out of an elastic material in order to _____ the time over which a person coomes to a stop, which _____ the force acting on the person.
a)
Increase; decreases
b)
Increase; increases
c)
Decrease; decreases
d)
Decrease; increases
16.

Which of the following is NOT a unit of momentum?

a)

kg*m/s

b)

N*s

c)

kg*mph

d)

kg*m/s2

17.
If a net force is acting on an object, 
a)
its velocity must be constant
b)
its velocity must be changing
c)
its mass must be changing
d)
its acceleration = 0 
18.
Most modern vehicles have padded dashboards. This reduces collision injuries by...
a)
reducing the driver's change in momentum
b)
increasing the driver's change in momentum
c)
increasing the force of impact
d)
increasing the time of impact
19.

In an elastic collision, ______ is conserved.

a)

Momentum only

b)

Kinetic Energy only

c)

Both momentum and energy

20.
In a perfectly inelastic collision, ______ is conserved. 
a)
Momentum only
b)
Kinetic Energy only
c)
Both momentum and kinetic energy
21.
Which of the following collisions is not perfectly elastic nor perfectly inelastic?
a)
a football tackle where both players fall wrapped together
b)
a cue ball hitting a billiards ball
c)
a flower pot breaking over someone's head
d)
an arrow staying in the apple after impact
22.
A person on a stationary skateboard throws a bowling ball with a velocity of 5.0 m/s. What is a possible speed of the person after the throw? 
a)
0 m/s
b)
1.5 m/s
c)
5.0  m/s
d)
7.5 m/s
23.
The recoil speed of a rifle is much less than the exit velocity of a bullet because...
a)
the rifle experiences a smaller force
b)
the rifle experiences a smaller change in momentum
c)
the rifle has a much greater mass
d)
the rifle does not obey the laws of physics
24.
A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball. 
a)
55 kg*m/s
b)
100 kg*m/s
c)
250 kg*m/s
d)
500 kg*m/s
25.

Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...

a)

Skater 1 experiences a greater change in momentum

b)

Skater 2 experiences a greater change in momentum

c)

Skater 1 has a greater speed than Skater 2

d)

Skater 1 experiences a greater force

26.
What happens to the speed of the wagon as the rain collects inside of it?
a)
it decreases
b)
it remains constant
c)
it increases
27.
A block sliding on a frictionless surface runs into a second block of equal mass at rest. After the two collide, they stick together and travel with a velocity...
a)
that is twice the magnitude of the original velocity
b)
that is half the magnitude of the original velocity
c)
more information is needed
28.
Two blocks begin at rest with an initial momentum of zero. After the spring is sprung, the two blocks move in opposite directions. What is the total final momentum? 
a)
zero
b)
a positive value in the direction of the heavier block
c)
a positive value in the direction of the faster block
d)
more information is needed
29.
Parkour Peter bends his knees upon landing in order to ____
a)
reduce his change in momentum
b)
increase his change in momentum
c)
increasing his landing time
d)
increasing his landing force
30.
Both students experience the same ____
a)
force of impact
b)
time of impact
c)
change in momentum
d)
all of the above
31.

A block of mass M slides across a frictionless surface with velocity v until collides with a stationary block of mass m. If the two blocks stick together, what is their velocity after the collision?

a)

(M+m)v / m

b)

(M-m)v

c)

Mv / (M+m)

d)

(M-m)v / M

32.
A biker with a mass of 75 kg moves along the path with a constant velocity of 5 m/s. What is the biker's momentum?
a)
25 m/s
b)
375 m/s
c)
25 kg m/s
d)
375 kg m/s
33.
A runner has a momentum of 670 kg m/s and is travelling at a velocity of 9 m/s. What is his mass?
a)
6030 kg
b)
0.0134 kg
c)
74.4 kg
d)
80 kg
34.

The units for Impulse are

a)

N/s

b)

N·s

c)

N

d)

m/s

35.
Cart A is pulled with a 2 Newton force for 2 seconds, and Cart B is pulled with a 1 Newton force for 3 seconds.  Which cart experiences the greatest impulse?
a)
Cart B
b)
Cart A
c)
they are the same
36.

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.

Calculate the impulse on the ball.

a)

1 N·s

b)

6 N·s

c)

66 N·s

d)

None of these

37.
The purpose of crumble zones on a car is to
a)
decrease time of impact.
b)
increase force of impact.
c)
increase the time of impact.
d)
decrease the impulse during impact.
38.
The difference between a car hitting a wall vs. a car hitting a hay stack is
a)
the Impulse on the car hitting the wall is greater
b)
the change in momentum of the car hitting the wall is greater
c)
the force on the car hitting the hay stack is greater
d)
the collision time of the car hitting the hay stack is greater
39.

A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s. The impulse on the ball is ______ N·s.

a)

-2.5

.

.

b)

-10

c)

-18

d)

-45

40.
The impulse-momentum theorem states that
a)
the impulse on an object is equal to the change in momentum it causes 
b)
the force on a moving object is equal to the magnitude of the impulse.
c)
the impulse on an object is greater than the change in momentum it causes 
d)
the impulse on an object is less than the change in momentum it causes
41.

A constant force of 4.5 N acts on a 7.2-kg object for 10.0 s. What is the change in the object's momentum?

a)

45 kg m/s

b)

72 kg m/s

c)

32.4 kg m/s

d)

0.45 kg m/s

42.
can a bullet have the same momentum a truck?
a)
yes
b)
no
43.
In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other.  The orange cart has a velocity of 2 m/s and the blue cart has a velocity of -1m/s.  The carts stick together when they collide.  Calculate their final speed.
a)
0.5 m/s
b)
1.0 m/s
c)
0.33 m/s
d)
0.67 m/s
44.

The momentum of an object depends upon the object's ___________&_____________.

a)

size and shape

b)

mass and speed

c)

mass and veloctiy

d)

mass and energy

45.

_________________ causes and is equal to a change in momentum

a)

Impulse

b)

Force

c)

Joule

d)

Watt

46.

Determine the momentum of 1,000-kg car moving northward at 20 m/s.

a)

20,000 N

b)

20,000 Joules

c)

20,000 Kg * m/s

d)

20,000 kg * m/s north

47.

When the speed of an object is doubled, its momentum...

a)

remains unchanged in accord with the conservation of momentum.

b)

doubles.

c)

quadruples.

d)

decreases.

48.
A 2 kg cart has a momentum of 16 kg m/s. What is its velocity?
a)
8 m/s
b)
32 m/s
c)
0.125 m/s
d)
18 m/s
49.
If two objects have the same mass, then the faster moving object has ____________ momentum.
a)
more 
b)
less
c)
the same
50.
While playing pool, the white cue ball strikes the 8 ball. Before the collision, the cue ball's velocity was 10 m/s and the 8 ball was at rest. If both ball's have a mass of 0.15 kg and the cue ball's velocity after the collision is 2 m/s, what is the 8 ball's velocity?
a)
2 m/s
b)
8 m/s
c)
-2 m/s
d)
1.5 m/s
51.
The total momentum before a collision is _________ the total momentum after a collision.
a)
equal to 
b)
less than 
c)
more than
d)
It depends on the type of collision
52.

The Law of Conservation of Momentum states:

a)

The total momentum before a collision is equal to the total momentum after a collision.

b)

The total momentum before a collision is greater than the total momentum after a collision.

c)

The total momentum before a collision is less than the total momentum after a collision.

d)

The total momentum before a collision is not related to the total momentum after a collision.

53.

According to Newton's Laws, for every action there is an ....

a)

equal and opposite reaction.

b)

equal and parallel reaction.

c)

unequal and opposite reaction.

d)

unequal and unrelated reaction.

54.

If two objects collide or explode, they experience

a)

the same force for the same amount of time.

b)

different forces for the same amount of time.

c)

different forces for different amounts of time.

d)

the same force for different amounts of time.

55.

If two objects collide or explode, they experience

a)

the same impulse causing the same change in momentum.

b)

different impulses causing the same change in momentum.

c)

different impulses causing different changes in momentum.

d)

the same impulse causing different changes in momentum.

56.

Pick all of the scenarios below that are collisions.

a)

A catcher catches a baseball.

b)

A pitcher throws a baseball.

c)

Two cars smash into each other.

d)

Two students on roller skates push away from each other.

e)

A bug smashes into a windshield.

57.

Pick all of the scenarios that are explosions.

a)

A cannon fires a cannon ball.

b)

A spoon is shoved into a jar of peanut butter.

c)

A linebacker tackles a member of the opposite team.

d)

A swimmer jumps off a floating raft.

e)

A figure skater throws a heavy ball.

58.

Which cart in the image experiences a greater impulse?

a)

E

b)

F

c)

Same

d)

Not enough info

59.

Which cart in the image experiences a greater force?

a)

E

b)

F

c)

Same

d)

Not enough info

60.

Which cart in the image experiences a greater change in momentum?

a)

E

b)

F

c)

Same

d)

Not enough info

61.

Which cart in the image experiences a greater change in velocity?

a)

E

b)

F

c)

Same

d)

Not enough info

62.

Which cart in the image experiences a greater acceleration?

a)

E

b)

F

c)

Same

d)

Not enough info

63.

Which of the 0.5kg spheres in the image experiences the greater impulse?

a)

Black

b)

White

c)

Same

d)

Not Enough Info

64.

Which of the 0.5kg spheres in the image experiences the greater force?

a)

Black

b)

White

c)

Same

d)

Not Enough Info

65.

Which of the 0.5kg spheres in the image experiences the greater change in momentum?

a)

Black

b)

White

c)

Same

d)

Not Enough Info

66.

Which of the 0.5kg spheres in the image experiences the greater change in velocity?

a)

Black

b)

White

c)

Same

d)

Not Enough Info

67.
Which of the following correctly explains why less force is required to stop a person using an airbag?
a)
hitting the airbag decreases the person's momentum
b)
the airbag changes the person's momentum over a longer time interval
c)
the airbag is very soft, like a pillow
d)
decreasing the time of the impact decreases the force of the impact
68.
This picture is an example of ____________
a)
Elastic Collision
b)
Inelastic collision
69.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
70.
The recoil speed of a rifle is much less than the exit velocity of a bullet because...
a)
the rifle experiences a smaller force
b)
the rifle experiences a smaller change in momentum
c)
the rifle has a much greater mass
d)
the rifle does not obey the laws of physics

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