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Momentum

Total questions: 50

Worksheet time: 1hrs 18mins

Name
Class
Date
1.

Which of the following has the MOST momentum?

a)

rolling ping-pong ball

b)

rolling bowling ball

c)

rolling soccer ball

d)

rolling basketball

2.

Which object has more momentum?

a)

motorcycle at 15 mph?

b)

bike at 15 mph

c)

car at a stoplight

d)

runner at 10 mph

3.

If an object has a momentum of 40 kgm/s and a mass of 60 kg, what is it's velocity?

a)

2400 m/s

b)

1.5 m/s

c)

240 m/s

d)

.67 m/s

4.

If an object has a velocity of 15 m/s and a momentum of 30 m/s, what is its mass?

a)

450 m/s

b)

2 m/s

c)

4,500 m/s

d)

.5 m/s

5.
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 
6.
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
7.

In an elastic collision, ______ is conserved.

a)

Momentum only

b)

Kinetic Energy only

c)

Both momentum and energy

8.
In a perfectly inelastic collision, ______ is conserved. 
a)
Momentum only
b)
Kinetic Energy only
c)
Both momentum and kinetic energy
9.
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
10.
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
11.

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

12.
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
13.
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
14.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
15.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
16.
A 9 kg blob moving at 5 m/s collides and sticks to a second blob with a mass of 5 kg. If the two bobs stick together, what will the velocity of the two blobs move at?
a)
3.57 m/s
b)
3.2 m/s
c)
10.0  m/s
d)
9.0  m/s
17.
A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. 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
18.
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
19.
Momentum is a ____________________ quantity
a)
science
b)
scalar
c)
vector
d)
energy
20.
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
21.

a bat strikes a 0.05 kg baseball so that its velocity changes by +30 m/s in 0.1 s. With what average force was the ball struck?

a)

+15 N

b)

-15 N

c)

+300 N

d)

-300 N

e)

+150 N

22.
The impulse is ______ the change in momentum
a)
greater than
b)
equal to
c)
less than
d)
always double
23.
When two objects collide, the Momentumbefore is ____________ the Momentumafter.
a)
more than 
b)
less than 
c)
equal to
d)
unrelated to
24.

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

25.
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
26.
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
27.
If an air bag changes a 60 kg person's speed from 40.0 m/s to     0.0 m/s, what impulse must act on the person? 
a)
 2400 kg.m/s
b)
1.5 kg.m/s
c)
0.67 kg.m/s
d)
1500 kg.m/s
28.
Which takes more force  to catch, a bowling ball or a ping pong ball?
a)
bowling ball because it has more momentum
b)
ping pong ball because it has more momentum
c)
both require the same amount of force when catching
d)
bowling ball because it has less momentum
29.

A car and bird are about to hit each other. What is not true about the collision?

a)

They will have the same change in velocity

b)

They will experience the same force.

c)

They will experience the same change in momentum

d)

The total momentum is the same before and after the collision.

30.

A 1 kg ball rolling 4 m/s runs into another 2 kg ball which is not moving. How much total momentum does the balls have before the collision

a)

4

b)

6

c)

12

d)

0

31.

A 1 kg ball rolling 4 m/s runs into another 2 kg ball which is not moving. How much total momentum does the balls have after the collision?

a)

4

b)

12

c)

6

d)

0

32.

The two boxes shown are about to collide. The box on the left will come to a stop. The box on the right will bounce backwards. The 5 kg box will have a change in momentum of ...

a)

12 kg m/s

b)

10 kg m/s

c)

-10 kg m/s

d)

16 kg m/s

33.

Consider this elastic collision between two spheres. They collide and then bounce apart. Sphere A has a mass of 8-kg. Sphere B has a mass of 5-kg. Before the collision, Sphere A is travelling to the right at 3 m/s and Sphere B is travelling to the left at 4 m/s. After the collision, Sphere A is travelling 2 m/s. How fast is Sphere B travelling after the collision?

a)

about 5.6 m/s

b)

about 3.2 m/s

c)

about 7.4 m/s

d)

about 8.1 m/s

34.
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
35.
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
36.
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
37.

If a force is exerted on an object, which statement is true?

a)

a large force always produces a large change in the object's momentum

b)

a large force produces a large change in the object's momentum only if the force is applied over a very short time interval

c)

a small force applied over a long time interval can produce a large change in the object's momentum

d)

a small force produces a large change in the object's momentum

38.
Jorge noticed a collision outside the coffee shop where two cars collided and stuck together.  What type of collision did he observe?
a)
Elastic
b)
Inelastic
c)
Completely inelastic
d)
none
39.
While playing pool, Emma notices that the pool balls bounce apart.  What type of collision is this?
a)
Elastic
b)
Inelastic
c)
Explosive
d)
Force
40.

No collision is either perfectly elastic or perfectly inelastic.

a)

True

b)

False

41.
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.
42.

Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?

a)

car

b)

bike

c)

they are equal

d)

cannot determine using the info provided

43.

A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. If all the momentum is transferred, 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

44.

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

Calculate the impulse on the ball.

a)

1 kg*m/s

b)

6 kg*m/s

c)

33.3 kg*m/s

d)

None of these

45.

A .05 kg rubber ball is dropped and hits the floor with an initial velocity of 10 m/s. It rebounds away from the floor with a final speed of 7 m/s after being in contact with the floor for .01 seconds. Find the magnitude of the force exerted by the floor on the rubber ball.

a)

-25 N

b)

25 N

c)

-85 N

d)

0.85 N

46.

A diver of mass 65 kg is initially at rest holding a speargun. He shoots a 2 kg spear from the gun with a speed of 15 m/s at a fish, but misses. How fast does the diver move backwards immediately after the spear is shot?

a)

30 m/s backwards

b)

.38 m/s backwards

c)

.46 m/s backwards

d)

47.5 m/s backwards

47.

A 0.035 kg bullets strikes a 5 kg stationary wooden block and embeds itself in the wood. The block and the bullet fly off together at 8.6 m/s. What was the original speed of the bullet?

a)

38 m/s

b)

0.75 m/s

c)

43 m/s

d)

1237 m/s

48.
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
49.
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
50.
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