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WorksheetsMomentum, Impulse and Conservation
Total questions: 55
Worksheet time: 1hrs 8mins
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 0.250 kg cart moving at 0.400 m/s has how much momentum?
a)
0.1 kg-m/s
b)
1 kg-m/s
c)
10 kg-m/s
d)
100 kg-m/s
3.
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
4.
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
5.
A large box slides across a frictionless surface with a velocity of 12 m/s and a mass of 4 kg, collides with a smaller box with a mass of 2 kg that is stationary. The boxes stick together. What is the velocity of the two combined masses after collision?
a)
0 m/s
b)
4 m/s
c)
8 m/s
d)
12 m/s
6.
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
7.
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
8.
In this type of collision, objects tend to "stick" together.
a)
elastic
b)
inelastic
c)
They "stick" together in both types of collisions
9.
A big fish swims upon and swallows a small fish at rest. After lunch, the big fish has less
a)
momentum
b)
velocity
c)
mass
10.
An 1 kg object moving to the right at 2 m/s collides inelastically with a 1 kg object moving to the left at 2 m/s. The final velocity of both objects will be
a)
0 m/s
b)
1 m/s
c)
2 m/s
d)
4 m/s
11.
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.
12.
Two football players with mass 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be:
a)
2 m/s
b)
3.4 m/s
c)
4.6 m/s
d)
7.1 m/s
13.
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
14.
The units for Impulse are
a)
N/s
b)
N⋅s
c)
N
d)
m/s
15.
Momentum is conserved in this type of collision
a)
elastic
b)
inelastic
c)
momentum is conserved in both types of collisions
16.
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
17.
Momentum is a ____________________ quantity
a)
science
b)
scalar
c)
vector
d)
energy
18.
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
19.
T/F: A big truck will always have more momentum than a small car.
a)
True
b)
False
20.
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.
21.
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
22.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
23.
A 1kg kick ball flying at 10m/s hits a wall and bounces off at 8m/s. What is the impulse?
a)
-2 N⋅s
b)
-18 N⋅s
c)
18 N⋅s
d)
20 N⋅s
24.
The units for momentum are
a)
kg
b)
m/s
c)
kg⋅m/s
d)
kg/m/s
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 force acts on an object for a given time. If the same force is allowed to act on the same object for a longer time, the impulse will be
a)
smaller
b)
greater
c)
the same
27.
Softer landings tend to
a)
increase impact force
b)
increase force
c)
increase collision time
d)
increase change in momentum
28.
It is beneficial for bungee jumpers to use elastic cords vs. stiff cords because
a)
it increases time
b)
it increases force
c)
there is no benefit
29.
The graph shows the force on an object of mass M as a function of time. For the time interval 0 to 4 s, the total change in the momentum of the object is
a)
40 kg m/s
b)
20 kg m/s
c)
0 kg m/s
d)
– 20 kg m/s
30.
The purpose of air bags 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.
31.
In any collision (crash) the ______ is ALWAYS constant.
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
32.
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
33.
How much momentum does a stationary battle ship have if it has a mass of 2,575,000 kg?
a)
2,575,000 N
b)
2,575,000 kg m/s
c)
0 Momentum requires mass and velocity
d)
none of the above
34.
If two objects collide and stick together, what will happen to their overall momentum?
a)
momentum will decrease
b)
momentum will increase
c)
momentum will stay the same
d)
none of the above
35.
Why should you follow through when playing tennis?
a)
To increase the amount of force applied
b)
To increase the amount of time the force is applied
c)
To keep the impulse constant
d)
To minimize the change in velocity
36.
A 10kg toy truck moves at 5m/s East. It collides and bounces off of a 5kg toy car moving 10 m/s moving west. Which equation would you use to solve for the final velocity of the car?
a)
m1v1i+m2v2i=m1v1f+m2v2f
b)
(m1+m2)vi=m1v1f+m2v2f
c)
m1v1i+m2v2i=(m1+m2)vf
37.
Identical cell phones are dropped onto two different surfaces. One phone takes 1 second to stop. Another phone takes 2 seconds to stop. What happens to the force for the 2 second stop?
a)
Force is 1/2 as big
b)
Force doubles
c)
Force stays the same
d)
Force is 1/4 as big
38.
An egg is thrown at a wall and at a bed sheet. The egg's change in velocity will be
a)
Greater for the wall collision
b)
Greater for the sheet collision
c)
Change in velocity is equal
39.
An egg is thrown at a wall and at a bed sheet. The force of impact will be
a)
Greater against the wall
b)
Greater against the sheet
c)
Force is equal
40.
The formula for Impulse is
a)
mass multiplied by time
b)
mass multiplied by time
c)
Force multiplied bymass
d)
Force multiplied by time
41.
Energy is lost during this type of collision
a)
elastic
b)
inelastic
c)
energy is lost in both types of collisions
42.
Paul is riding a motorbike while wearing a helmet with a face shield. A beetle hits Paul's face shield while Paul is moving at 30 mph. Which undergoes the greater change in momentum?
a)
Paul
b)
Beetle
c)
both are the same
43.
Paul is riding a motorbike while wearing a helmet with a face shield. A beetle hits Paul's face shield while Paul is moving at 30 mph. Which undergoes the greater force?
a)
Paul
b)
Beetle
c)
both are the same
44.
Paul is riding a motorbike while wearing a helmet with a face shield. A beetle hits Paul's face shield while Paul is moving at 30 mph. Which undergoes the greater impulse?
a)
Paul
b)
Beetle
c)
both are the same
45.
Paul is riding a motorbike while wearing a helmet with a face shield. A beetle hits Paul's face shield while Paul is moving at 30 mph. Which undergoes the greater acceleration?
a)
Paul
b)
Beetle
c)
both are the same
46.
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
47.
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
48.
A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s. The time for the collision is _____ seconds.
a)
1.8
.
.
.
.
b)
2.5
c)
3.6
d)
10
49.
A 0.5 kg ball moving at 5 m/s strikes a wall and rebounds in the opposite direction with a speed of 2 m/s. The time the ball is in contact with the ball is 0.01 s. Calculate the force acting on the ball by the wall during the collision. F = ______ N (magnitude only)
a)
0.14
b)
150
c)
350
d)
500
50.
Which has the greater change in momentum? An object that stops in a collision or the same object that bounces (rebounds) in a collision. Assume the object has the same speed and time of contact.
a)
Stops
b)
Bounces
c)
Both are the same
51.
A 60-kg rollerskater exerts a 10 N force on a 30-kg rollerskater for 0.2 second. What is the magnitude of the impulse applied to the 30-kg rollerskater?
a)
6.0 N*s
b)
50 N*s
c)
12 N*s
d)
2.0 N*s
52.
A bullet traveling at 500 m/s is brought to rest by an impulse of 50 N*s. What is the mass of the bullet?
a)
10 kg
b)
0.1 kg
c)
0.01 kg
d)
2500 kg
53.
A 0.60-kilogram softball initially at rest is hit with a bat. The ball is in contact with the bat for 0.20 seconds and leaves the bat with a speed of 25 meters per second. What is the magnitude of the average force exerted by the ball on the bat?
a)
15 N
b)
3.0 N
c)
75 N
d)
8.3 N
54.
Which two quantities can be expressed using the same units?
a)
momentum and energy
b)
energy and force
c)
impulse and force
d)
impulse and momentum
55.
A 40-kilogram mass is moving across a horizontal surface at 5.0 m/s. What is the magnitude of the net force required to bring the mass to a stop in 8.0 seconds?
a)
1 N
b)
40 N
c)
25 N
d)
5 N
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