Physical Science II
Momentum Review
Name_____________________
Period ____________________
1. Which object will have more momentum and why: a car traveling at 20m/s or a school bus
traveling at 20m/s?
A school bus traveling at 20m/s would have more momentum, because the bus would have
more mass than the car.
2. What two variables is momentum dependent upon?
Momentum is dependent on mass and velocity.
3. Describe what happens to objects involved in an elastic collision.
During an elastic collisions objects will bounce off of each other cleanly, without taking any
damage.
4. What would be an example of an elastic collision?
Two bumper cars colliding.
Two collision carts with magnetic bumpers colliding.
A super ball bouncing off of the floor.
5. Describe what happens to objects involved in a perfectly inelastic collision.
During a perfectly inelastic collision, objects collide and stick together.
6. What would be an example of a perfectly inelastic collision?
Two football players tackling each other on a field.
Two boxcars on railroad tracks colliding and coupling together.
A catcher catching a baseball that was thrown by the pitcher.
7. Describe what happens to objects involved in an inelastic collision.
During an inelastic collision objects collide, bounce off each other and will be damaged as a
result of the collision.
8. What would be an example of an inelastic collision?
Two cars colliding on a roadway.
9. In what type of collision(s) is momentum conserved?
Momentum is conserved in all types of collisions.
10. In class we demonstrated a separation of two carts, also called an “explosion”. Is momentum
conserved during a separation?
Yes. Momentum is conserved during a separation or explosion scenario.
11. What type of collision is the most common?
Inelastic collisions are the most common. Normally when objects collide there is damage done
to the objects involved. Even if the damage is small, there is still damage making the collision
inelastic.
12. Two carts are moving toward each other on a track. After they collide they stick together and
move with the same velocity. What type of collision has occurred?
A perfectly inelastic collision.
13. Two identical race cars are driving along a drag strip. One car is moving with a speed of 200km/h
while the other car is moving with a speed of 190km/h. Which car has more momentum?
The car moving at 200km/h will have more momentum, because it’s moving at a higher
velocity.
14. Calculate the momentum of a 2500kg car moving with a velocity of 15m/s.
p = mv
p = (2500kg)(15m/s) p = 37,500kgm/s
15. What is the velocity of a 70kg person who is moving with a momentum of 280kgm/s?
p = mv
v = (280kgm/s) ÷ (70kg)
v = 4m/s
16. What is the momentum of a 0.5kg baseball that is thrown at a speed of 38m/s?
p = mv
p = (0.5kg)(38m/s)
p = 19kgm/s
17. What is the mass of a dog that has a momentum of 400kgm/s and is running at a velocity of
10m/s?
p = mv
m = (400kgm/s) ÷ (10m/s)
m = 40kg
18.
Before:
1
After:
2
1
m1 = 1 kg
m2 = 5 kg
v1i = +2 m/s v2i = +1 m/s
2
m1 = 1 kg
m2 = 5 kg
v1f = +1 m/s v2f = ?
Before
After
Object 1
Object 2
Object 1
Object 2
Mass
1kg
5kg
1kg
5kg
Velocity
2m/s
1m/s
1m/s
1.2m/s
2kgm/s
5kgm/s
1kgm/s
6kgm/s
Momentum of
Each Object
Total
Momentum
7kgm/s
7kgm/s
19.
Before:
1
After:
2
1
m1 = 6 kg
m2 = 4 kg
v1i = +2 m/s v2i = +1 m/s
2
m1 = 6 kg
m2 = 4 kg
v1f = +1 m/s v2f = ?
Before
After
Object 1
Object 2
Object 1
Object 2
Mass
6kg
4kg
6kg
4kg
Velocity
2m/s
1m/s
1m/s
2.5m/s
12kgm/s
4kgm/s
6kgm/s
10kgm/s
Momentum of
Each Object
Total
Momentum
16kgm/s
16kgm/s
20.
Before:
1
After:
2
1
m1 = 8 kg m2 = 2 kg
v1i = 0 m/s v2i = –2 m/s
m1 = 8 kg
v1f = ?
2
m2 = 2 kg
v2f = +2 m/s
Before
After
Object 1
Object 2
Object 1
Object 2
Mass
8kg
2kg
8kg
2kg
Velocity
0m/s
-2m/s
-1m/s
2m/s
0kgm/s
-4kgm/s
-8kgm/s
4kgm/s
Momentum of
Each Object
Total
Momentum
-4kgm/s
-4kgm/s
21.
Before:
1
After:
2
1
m1 = 6 kg
m2 = 4 kg
v1i = +4 m/s v2i = 0 m/s
2
m1 + m2 = ?
vf = ?
Before
After
Object 1
Object 2
Objects 1 & 2
Mass
6kg
4kg
10kg
Velocity
4m/s
0m/s
2.4m/s
24kgm/s
0m/s
N/A
Momentum of
Each Object
Total
Momentum
24kgm/s
24kgm/s