WorksheetsImpulse and Momentum Unit Practice Test Part 1
Total questions: 53
Worksheet time: 4hrs 5mins
A 50 kg ball rolls down the street at 100 kg-m/s. Calculate the speed of the ball. ....p=mv
0.5 m/s
2 m/s
500 m/s
5000 m/s
How can a tennis ball and a bowling ball have the same momentum?
have the same speed
have different speeds
one is moving backwards
they can't
In this type of collision, objects tend to "stick" together.
elastic
inelastic
They "stick" together in both types of collisions
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?
150 kg
1,500 kg
37,500 kg
3,750 kg
A grocery shopper tosses a 9.0 kg bag of rice into a stationary 18.0 kg grocery cart. The bag hits the cart with a horizontal speed of 5.5 m/s toward the front of the cart. What is the final speed of the cart and bag?
3.66 m/s
1.83 m/s
1.38 m/s
6.33 m/s
A 16.0 kg canoe moving at 12 m/s makes an elastic head-on collision with an 4.0 kg raft moving at 6.0 m/s. After the collision, the raft moves to the left at 22.7 m/s. Find the velocity of the canoe after the collision.
12 m/s
3.48 m/s
7.825 m/s
10.8 m/s
A student driver steps on the gas pedal of an 1100 kg car applying a force of 600 N for 5 seconds. Determine the impulse applied to the car.
3000 Ns
539,000 Ns
120 Ns
5500 Ns
Which of the following has the greatest momentum?
a scurrying cockroach
a parked semi-truck
more information is needed
Two students hold an open bed sheet loosely by its corners to form a "catching net". The instructor asks a third student to throw an egg into the middle of the sheet as hard as possible. Which formula explains why the shell doesn't break?
p = mv
FΔt = mvf - mfi
F = ma
m1v1,i + m2v2,i = m1v1,f + m2v2,f
A football punter accelerates a 0.55 kg football from rest to a speed of 8.0 m/s in 0.25 s. What constant force does the punter exert on the ball?
16 N
10 N
18 N
24 N
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?
0.01 s
0.001 s
0.02 s
0.23 s
A 0.15 kg mass moving at +26 m/s is slowed by a constant force of -390 N. How far does the mass travel before stopping?
0.35 m
1.2 m
0.16 m
0.13 m
If an object is not moving, what is its momentum?
0 kg*m/s
Impossible to determine without knowing the mass
1 kg*m/s
10 kg*m/s
Two skaters initially at rest push against each other so that they move in opposite directions. When they begin moving, which skater will have a greater velocity?
the smaller skater will have the greater velocity
the larger skater will have the greater velocity
they will have the same velocity
it is impossible to tell given the limited information
Two skaters initially at rest push against each other so that they move in opposite directions. When they begin moving, which skater will have a greater momentum?
we need to know the mass of the skaters to answer this question
they will have the same magnitude momentum
the larger one will have a smaller momentum, and the smaller skater will have a greater momentum
the smaller skater will have a smaller momentum, and the larger skater will have a greater momentum
A tennis player places a 55kg ball machine on a frictionless surface. The machine fires a 0.057 kg tennis ball horizontally with a velocity of 36 m/s toward the north. What is the final velocity of the machine?
0.023 m/s to the south
0.037 m/s to the south
0.046 m/s to the south
0.062 m/s to the south
Two hockey pucks, with masses of 0.35 kg, are sliding directly toward one another. Puck A is moving with a velocity of -7.0 m/s, and Puck B is moving with a velocity of 1.7 m/s. After they collide, Puck A is moving with a velocity of -2.7 m/s. What is the velocity of Puck B?
1.7 m/s
-3.9 m/s
-2.6 m/s
-1.6 m/s
Momentum is conserved during collisions.
True
False
Conservation of momentum means the total initial momentum of a system _________ the total final momentum.
equals
is less than
is greater than
Momentum is a...
vector.
scalar.
Impulse is a...
vector.
scalar.
Time of collision is a...
vector.
scalar.
Force of impact is a...
vector.
scalar.
The momentum of a 1 kg toucan flying with a velocity of 4 m/s north is...
4 kgm/s north
0.25 kgm/s north
- 4 kgm/s north
- 1/4 kgm/s south
Impulse is the change in the momentum of an object.
True
False
Momentum is...
mv
m / v
0.5mv2
mgh
An museum guard watches in horror as an ancient porcelain vase (m=5kg) falls toward the ground. The vase suddenly comes to a stop as it collides with the museum floor, reducing its velocity from 10 m/s to 0 m/s in 0.01 seconds. What is the force of impact on the vase?
5000 N downward
5000 N upward
50 N upward
50 N downward
The momentum of an object depends upon the object's ___________&_____________.
size and shape
mass and inertia
mass and veloctiy
mass and energy
Most modern vehicles have padded dashboards. This reduces collision injuries by...
reducing the driver's change in momentum
increasing the driver's change in momentum
increasing the force of impact
increasing the time of impact
A test crash was studied and a graph of its Force over Time was produced. If a cushion was added and the crash was repeated, what should occur to the graph?
Force peak would increase, and time of collision would increase.
Force peak would decrease, and time of collision would increase.
Force peak would increase, and time of collision would decrease.
Force peak would decrease, and time of collision would decrease.
Which has more momentum: a truck stopped at a red light or a bike moving at 15 mph?
car
bike
they are equal
cannot determine using the info provided
Momentum is a ____________________ quantity
science
scalar (without direction)
vector (with direction)
energy
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?
0 m/s
<5 m/s
5.0 m/s
>5 m/s
A 65 kg ice skater standing on frictionless ice throws a 0.15 kg snowball horizontally at a speed of 32.0 m/s. At what velocity does the skater move backward?
- 0.07 m/s
- 0.30 m/s
- 0.15 m/s
- 1.20 m/s
None of the above
While playing pool, Emma notices that the pool balls bounce apart. What type of collision is this?
Elastic
Inelastic
Explosive
Force
What are the units for momentum?
m/sec
kg/sec
kg/m
kg m/sec
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?
38 m/s
0.75 m/s
43 m/s
1237 m/s
A 75 kg hockey goalie (initially at rest) catches and holds a 0.105 kg puck that was moving at him 24 m/s. With what speed does the goalie slide on the ice after the catch?
0.034 m/s
23.97 m/s
74.63 m/s
1.30 m/s
A 0.02 kg bug is flying South at 1.5 m/s. What force would stop it in 0.01 second?
0.024 N
150 N
3 N
0.75 N
What is the total impulse
for t = 0 - 5 seconds?
6 N*s
4 N*s
10 N*s
8 N*s
The Law of Conservation of Momentum states:
The total momentum before a collision is equal to the total momentum after a collision.
The total momentum before a collision is greater than the total momentum after a collision.
The total momentum before a collision is less than the total momentum after a collision.
The total momentum before a collision is not related to the total momentum after a collision.
If two objects collide or explode, they experience
the same force for the same amount of time.
different forces for the same amount of time.
different forces for different amounts of time.
the same force for different amounts of time.
The cue ball (white) has a mass of 0.6 kg and the 8 ball (black) has a mass of 0.5 kg. Which of these spheres in the image experiences the greater change in momentum?
Black
White
Same
Not Enough Info
The cue ball (white) has a mass of 0.6 kg and the 8 ball (black) has a mass of 0.5 kg. Which of these spheres in the image experiences the greater change in velocity?
Black
White
Same
Not Enough Info
The cue ball (white) has a mass of 0.6 kg and the 8 ball (black) has a mass of 0.5 kg. Which of these spheres in the image experiences the greater force?
Black
White
Same
Not Enough Info
