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Momentum

Total questions: 76

Worksheet time: 2hrs 30mins

Name
Class
Date
1.
The law of conservation of momentum states that, 
a)
p before is less than p after
b)
p before is the same as p after
c)
p before is more than p after
2.
A 2.5 kg ball moving at 4.2 m/s collides with a 2.5 kg stationary ball. If the first ball is at rest after the collision, what is the velocity of the second ball? 
a)
2.1 m/s
b)
2.5 m/s
c)
4.2 m/s
d)
8.4 m/s
3.
A 3,000 kg truck moving at +10 m/s hits a 1,000 kg parked car which moves off at +15 m/s. What is the velocity of the truck?
a)
10 m/s
b)
0 m/s
c)
5 m/s
d)
2 m/s
4.
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
5.
What makes it possible to determine the motion of objects before or after colliding?
a)
Conservation of Energy
b)
Conservation of Strength
c)
Conservation of Momentum
d)
Conservation of Homework
6.
Collisions can be ____________or ___________.
a)
fast or slow
b)
far or near
c)
elastic or inelastic
d)
none of the above
7.
The total momentum before a collision is _________ the total momentum after a collision. (conservation of momentum)
a)
equal to 
b)
less than 
c)
more than
d)
It depends on the type of collision
8.
What is the the total momentum of the red and blue ball before the collision?
a)
16 kg m/s
b)
32 kg m/s
c)
2 kg m/s
d)
6 kg m/s
9.
A dart with a mass of 0.5kg is thrown at 15m/s and sticks into a 1kg apple hanging on a string.  What is the velocity of the dart and apple just after the dart is embedded? 
a)
0 m/s
b)
5 m/s
c)
10 m/s
d)
15 m/s
10.
When is momentum conserved in a collision?
a)
When the collision is inelastic.
b)
When the collision is elastic.
c)
When the collision is inelastic OR elastic but never an explosion.
d)
All collisions.
11.

A BMW rear ends a car at the stop light. Neither car sticks together. The momentum was conserved in the collision but the kinetic energy was not conserved. What type of collision is this?

a)

Elastic Collision

b)

Inelastic Collision

c)

Perfectly inelastic Collision

d)

No Collision

12.

2 balls collide and bounce off of each other. During the collision total momentum remained constant and total kinetic energy remained constant. What type of collision is this?

a)

Inelastic Collision

b)

Elastic Collision

c)

Perfectly Inelastic Collision

d)

No collision occurred

13.

A piece of silly putty is dropped onto a skateboard as it rolls by. The putty sticks to the skateboard and moves the direction the board is moving. What type of collision is this?

a)

Inelastic collision

b)

Elastic Collision

c)

Perfectly Inelastic collision

d)

No collision

14.

If a collision is elastic which of the following must be true?

a)

Momentum is not conserved

b)

The objects are in an open system

c)

The total momentum is equal to 0

d)

Kinetic Energy is conserved

15.

If a collision is inelastic which of the following must be true?

a)

the total momentum of the system is conserved

b)

The total momentum of the system is not conserved

c)

The total momentum of the system is 0

d)

The total kinetic energy of the system is conserved

16.

If there is a perfectly inelastic collision, which of the following must be true?

a)

The total momentum of the system is 0

b)

The total kinetic energy of the system is conserved

c)

The objects stick together after colliding

d)

The total momentum of the system is not conserved

17.

Two carts collide. They stick together and continue moving. Is momentum conserved in this interaction?

a)

Yes

b)

No

18.

Two metal balls collide in an elastic collision. Is momentum conserved in this collision?

a)

Yes

b)

No

19.

Two metal balls collide in an elastic collision. Is total kinetic energy conserved in this collision?

a)

Yes

b)

No

20.

Two cars collide in a car crash. During the crash the cars bumpers became dented and some thermal energy was given off in the crash. Was Total Kinetic Energy conserved in the crash?

a)

No

b)

Yes

21.

Two cars collide in a car crash. During the crash the cars bumpers became dented and some thermal energy was given off in the crash. Was momentum conserved in the crash?

a)

No

b)

Yes

22.

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

23.
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
24.

What are the units of Force?

a)

kg m/sec

b)

kg m

c)

N

d)

N sec

25.
If two objects have the same mass, then the faster moving object has ____________ momentum.
a)
more 
b)
less
c)
the same
26.
Momentum is a ____________________ quantity
a)
science
b)
scalar
c)
vector
d)
energy
27.

Which object listed below has the greatest momentum?

a)

A 0.05 kg object rolling at 0.2 m/s.

b)

A 0.15 kg object rolling at 2 m/s.

c)

A 0.15 kg object rolling at 1 m/s

d)

A 0.4 kg object rolling at 2 m/s.

28.

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

29.
What is the unit for momentum?
a)
m/s
b)
kg/s
c)
kg/m
d)
kg m/s
30.

In any collision (crash) the ______ is ALWAYS constant

a)

Total Momentum

b)

total speed

c)

total Velocity

d)

Energy

31.
A(n) _________________ causes and is equal to a change in momentum
a)
impulse
b)
force
c)
joule
d)
watt
32.

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

33.
can a bullet have the same momentum a truck?
a)
yes
b)
no
34.

A 2.5 kg ball moving at 5 m/s collides with a 2.5 kg stationary ball in a perfectly elastic collision. What is the velocity of the second ball after the collision?

a)

5 m/s

b)

2.5 m/s

c)

10 m/s

d)

7.5 m/s

35.
If 2 objects collide and stick together, what will happen to their velocities?
a)
velocities will increase
b)
velocities will decrease
c)
velocities will stay the same
d)
none of the above
36.
Rahim observed a collision in lab where the kinetic energy after the collision was equal to the kinetic energy before the collision.  This type of collision is
a)
Completely Inelastic
b)
Elastic
c)
Inelastic
37.

A 10kg toy truck moves at 5m/s East. It collides head-on with a 5kg toy car moving 10 m/s moving west. What is the total momentum of the system?

a)

0 kgm/s

b)

30 kgm/s

c)

50 kgm/s

d)

10 kgm/s

38.
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
39.
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
40.

When comparing the momentum of two moving objects, which of the following is correct?

a)

the object with the higher velocity will have less momentum if the masses are equal

b)

the more massive object will have less momentum if its velocity is greater

c)

the less massive object will have less momentum if the velocities are the same

d)

the more massive object will have less momentum if the velocities are the same

41.

A child with a mass of 23 kg rides a bike with a mass of 5.5 kg at a velocity of 4.5 m/s to the south. Compare the momentum of the child with the momentum of the bike.

a)

Both the child and the bike have the same momentum

b)

the bike has a greater momentum than the child

c)

the child has a greater momentum than the bike

d)

neither the child nor the bike has momentum

42.

Which of the following has the greatest momentum?

a)

a tortoise with a mass of 275 kg moving at a velocity of 0.55 m/s

b)

a hare with a mass of 2.7 kg moving at a velocity of 7.5 m/s

c)

a turtle with a mass of 91 kg moving at a velocity of 1.4 m/s

d)

a roadrunner with a mass of 1.8 kg moving at a velocity of 6.7 m/s

43.

Two Pool Balls collide and then go separate directions.

a)

inelastic collision

b)

elastic collision

c)

explosion

d)

none of these

44.

What is the TOTAL MOMENTUM for the system BEFORE COLLISION?

a)

14 Kg x m/s

b)

10 Kg x m/s

c)

24 Kg x m/s

d)

-24 Kg x m/s

45.
This picture is an example of ____________
a)
Elastic Collision
b)
Inelastic collision
46.

The principle of conservation of momentum:

a)

mv1=mv2mv_1=mv_2

b)

Σma1=Σma2\Sigma ma_1=\Sigma ma_2

c)

Σmv1=Σmv2\Sigma mv_1=\Sigma mv_2

d)

Σmv=Σmv\Sigma mv=\Sigma mv

47.
a)

v=20ms−1v=20ms^{-1}

b)

v=11ms−1v=11ms^{-1}

c)

v=10ms−1v=10ms^{-1}

d)

v=24ms−1v=24ms^{-1}

48.
a)

vwoman>vmanv_{woman}>v_{man}

b)

vwoman<vmanv_{woman}<v_{man}

c)

mwoman<mmanm_{woman}<m_{man}

d)

mwoman>mmanm_{woman}>m_{man}

49.

A bat hits a baseball in the real physical world. The total momentum _____ after the collision.

a)

increased

b)

decreases

c)

remains constant

d)

stays at zero

50.

A bat hits a baseball in the real physical world. The total momentum decreases during the collision because _____.

a)

mechanical energy turns into sound energy

b)

mechanical energy turns into heat energy

c)

mechanical energy turns into both heat energy and sound energy

d)

none of the above

51.
Which object has the greatest momentum?
a)
An 18-wheeler tractor trailer at rest.
b)
An average mass person walking.
c)
A sports car driving on the highway.
52.

A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. The railroad car is brought to a sudden stop while the boxcar moves away from the collision. At what speed will the second boxcar move?

a)

18.6 m/s

b)

9.3 m/s

c)

7.5 m/s

d)

1.86 m/s

53.

A 0.15 kg mass moving at +26 m/s is slowed to a stop by a force of -390 N. How long does it take the force to stop the mass?

a)

0.01 s

b)

0.001 s

c)

0.02 s

d)

0.23 s

54.

A car is traveling 20 m/s. It takes 4 seconds with a 7,500 N force to come to a stop. What is the mass of the car?

a)

150 kg

b)

1,500 kg

c)

37,500 kg

d)

3,750 kg

55.
A runner has a momentum of 670 kg m/s and is traveling at a velocity of 9 m/s. What is his mass?
a)
74.4 kg
b)
6030 kg
c)
0.0134 kg
d)
679 kg
56.

A Russian cosmonaut(87 kg) and USA astronaut(94 kg) are outside the ISS and decide to run a momentum experiment. They are motionless facing each other palm to palm, then push apart from each other. What happens to their momentum?

a)

their total momentum doubles

b)

their total momentum decreases

c)

the guy with the smaller mass has less momentum

d)

their momenta are opposite but equal

57.

In which one of the following situations is linear

momentum not conserved?

a)

A bomb suspended by a string explodes into one hundred fragments.

b)

A bowling ball collides with a set of ten pins.

c)

An astronaut floating in space throws a hammer away and subsequently moves in the opposite direction.

d)

A tree limb is struck by lightning and falls to the ground.

58.

Two objects constitute an isolated system. In an elastic

collision between the two objects, which one of the

following statements is a false statement?

a)

The total kinetic energy is conserved.

b)

The kinetic energy of each object is the same before and after the collision.

c)

The total momentum is conserved.

d)

The magnitude of the force exerted by each object on the other object is equal.

59.

A soccer ball approaches a kicker’s foot at 3 m/s. The foot is in contact with the ball for .02 s and afterwards the ball

travels in the opposite direction at 5 m/s. Find the magnitude of the force the foot exerts on the ball.

a)

100

b)

200

c)

400

d)

800

60.

A ball of mass 5 kg falls vertically, hits the floor with a speed 2 m/s and rebounds with a speed of 1 m/s. What is the magnitude of the impulse

exerted on the ball by the floor?

a)

5

b)

10

c)

15

d)

2.5

61.

A 12 kg box sliding on a horizontal has an initial

speed of 4.0 m/s. The coefficient of friction between

the box and the floor is 0.20. The box moves a

distance of 4.0 m in 2.0 s. What is the magnitude

of the change in momentum of the box in this time?

a)

12

b)

24

c)

48

d)

96

62.

As shown in the figure above, a child of mass M

who is running at a speed of v jumps onto a

stationary sled of equal mass M on a frozen lake.

What percent of the initial kinetic energy is lost?

a)

25%

b)

50%

c)

75%

d)

100%

63.

Block A of mass 2.0 kg is released from rest at the

top of a 6.0 m long plane inclined at an angle of 30o,

as shown in the figure above. After sliding on the

horizontal surface, block A hits and sticks to block B,

which is at rest and has mass 4.0 kg. Assume there

is no friction.

a)

3.2 m/s

b)

2.2 m/s

c)

1.8 m/s

d)

2.6 m/s

64.

A 1.0 kg lump of clay is sliding to the right on a frictionless

surface with speed 2 m/s. It collides head-on and sticks to

0.5 kg metal sphere that is sliding to the left with speed 4

m/s. What is the kinetic energy of the combined objects

after the collision?

a)

6 J

b)

4 J

c)

0 J

d)

2 J

65.

A 1.0 kg lump of clay is sliding to the right on a frictionless

surface with speed 2 m/s. It collides head-on and sticks to

0.5 kg metal sphere that is sliding to the left with speed 4

m/s. What is the kinetic energy of the combined objects

after the collision?

a)

Graph 1 only

b)

Graph 2 only

c)

Either graph could be used

d)

Neither graph could be used

66.

A stationary bomb explodes in space breaking into a number of small fragments. At the location of the explosion, the net force due to gravity is zero newtons. Which one of the following statements concerning this event is true?

a)

Kinetic energy is conserved in this process.

b)

All of the fragments must have equal kinetic energies.

c)

The sum of the kinetic energies of the fragments must be zero.

d)

The vector sum of the linear momenta of the fragments must be zero.

67.

During hockey practice, two pucks are sliding across the ice in the same direction. At one instant, a 0.18-kg puck is moving at 16 m/s while the other puck has a mass of 0.14 kg and a speed of 3.8 m/s. What is the velocity of the center of mass of the two pucks?

a)

5.0 m/s

b)

7.0 m/s

c)

9.0 m/s

d)

11 m/s

68.

A car of mass m, traveling at speed v, stops in time t when maximum braking force is applied. Using the same braking force, what time would be required to stop a car of mass 2m traveling at speed v?

a)

t/2

b)

t

c)

2t

d)

4t

69.

a)

A

b)

B

c)

C

d)

D

70.

a)

A

b)

B

c)

C

d)

D

71.

a)

A

b)

B

c)

C

d)

D

72.

a)

A

b)

B

c)

C

d)

D

73.

a)

A

b)

B

c)

C

d)

D

e)

E

74.

a)

A

b)

B

c)

C

d)

D

75.

a)

A

b)

B

c)

C

d)

D

76.

a)

A

b)

B

c)

C

d)

D

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