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Conservation of Momentum

Conservation of Momentum

Assessment

Presentation

Physics

11th - 12th Grade

Medium

NGSS
HS-PS2-2, HS-PS2-1

Standards-aligned

Created by

Robert Lashbrook

Used 7+ times

FREE Resource

20 Slides • 17 Questions

1

Conservation of Momentum

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2

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3

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4

Multiple Choice

What is needed to change an object's velocity?

1

a force

2

an impulse

3

a vector

5

Multiple Choice

What does it take to change an object's momentum?

1

a force

2

an impulse

3

a vector

6

Multiple Choice

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For an internal system such as seen in the cannon-cannonball system, before the firing, the system is at rest and the momentum is zero. After the firing, the net momentum or total momentum, is _______.

1

more

2

less

3

still zero

7

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8

Multiple Choice

Momentum is a

1

vector

2

scaler

9

Let's work a problem:

  • •A 100 kg cannon fires a 5 kg cannonball at 100 m/s. How fast does the cannon move backwards?

    •Use the GUESS method

    •Given: M1 = 100  M2 = 5 kg   V2 = 100 m/s

    •Unknown:  V1 = ?

    •Equation:  M1 V1 = M2 V2  

    •Substitute:  100 kg x V1 = 5 kg x 100 m/s

    •Solve:  V1 = 5 m/s

10

Multiple Choice

A .030 kg bullet is fired from a gun with a speed of 350 m/s. If the gun has a mass of 0.9 kg, What is the recoil speed of the gun?

1

11.7 m/s

2

9.0 m/s

3

10.5 m/s

4

10 m/s

11

Multiple Choice

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The recoil speed of a rifle is much less than the exit velocity of a bullet because...

1

the rifle experiences a smaller force

2

the rifle experiences a smaller change in momentum

3

the rifle has a much greater mass

4

the rifle does not obey the laws of physics

12

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13

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14

Multiple Choice

Newton’s second law states that if no net force is exerted on a system, no acceleration occurs. Does it follow that no change in momentum occurs?

1

yes

2

no

15

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16

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17

Multiple Choice

Newton’s third law states that the force a cannon exerts on a cannonball is equal and opposite to the force the cannonball exerts on the cannon. Does it follow that the impulse a cannon exerts on a cannonball is equal and opposite to the impulse the cannonball exerts on the cannon?

1

yes

2

no

18

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19

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20

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21

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22

Multiple Choice

In an ________ collision, two objects collide without being deformed or generating any heat. Think billiard balls!

1

elastic

2

inelastic

23

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24

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25

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26

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27

Multiple Choice

Two carts with mass 75 kg and 100 kg run into each other with speeds of 6 m/s and 8 m/s respectively. If they hook together as they collide, the combined speed of the two carts just after the collision would be:

1

-2 m/s

2

3.4 m/s

3

4.6 m/s

4

7.1 m/s

28

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29

Multiple Choice

Two carts with mass 50 kg and 150 kg respectively run into each other. The first cart is traveling at a velocity of 8 m/s. The second cart was at rest. If they hook together as they collide, the combined speed of the two carts just after the collision would be:

1

2 m/s

2

3.4 m/s

3

4.6 m/s

4

-7.1 m/s

30

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31

Multiple Choice

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:

1

-2 m/s

2

3.4 m/s

3

4.6 m/s

4

-7.1 m/s

32

Multiple Choice

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Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...

1

Skater 1 experiences a greater change in momentum

2

Skater 2 experiences a greater change in momentum

3

Skater 1 has a greater velocity than Skater 2

4

Skater 1 experiences a greater force

33

Multiple Choice

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?
1
10 m/s
2
0 m/s
3
5 m/s
4
2 m/s

34

Multiple Choice

The total momentum before a collision is _________ the total momentum after a collision.

1

equal to

2

less than

3

more than

4

It depends on the type of collision

35

Multiple Choice

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

1

0 m/s

2

1 m/s

3

2 m/s

4

4 m/s

36

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37

Multiple Choice

A 1000 kg car is traveling east with a velocity of 10 m/s collides with a 5000 kg northbound truck moving at a velocity of 8 m/s. What is the magnitude and direction of the resultant inelastic collision?

1

41, 231 kg m/s

south/ southeast

2

41, 231 kg m/s north/northeast

3

45,321 kg m/s north/northeast

4

36, 565 kg m/s

south/ southeast

Conservation of Momentum

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