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3. Conservation of Momentum Elastic

3. Conservation of Momentum Elastic

Assessment

Presentation

Physics

11th Grade

Practice Problem

Medium

NGSS
HS-PS2-2, MS-PS3-1, HS-PS2-1

+1

Standards-aligned

Created by

Victoria Vercammen

Used 6+ times

FREE Resource

30 Slides • 15 Questions

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3. Conservation of Momentum Elastic

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Multiple Choice

The cherries:

What kind of collision is this?

1

Elastic

2

Inelastic

3

Explosion

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Multiple Choice

Both pucks have a mass of 1.0 kg. Puck A is at rest and puck B comes in at 2 m/s. What is the momentum of A and B?

1

A: 0 kg⋅m/s

B: 2 kg⋅m/s

2

A: 2 kg⋅m/s

B: 0 kg⋅m/s

3

A: -2 kg⋅m/s

B: 2 kg⋅m/s

4

A: 0 kg⋅m/s

B: 0 kg⋅m/s

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Multiple Choice

What is the total momentum of this system? (add them)

1

2 kg⋅m/s

2

0 kg⋅m/s

3

That's not possible

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Multiple Choice

What happens AFTER they collide?

1

Both stop moving

2

Both move together in the direction that puck B was moving, just slower

3

Puck B stops and puck A moves to the right instead

4

Puck A stays put and puck B bounces back

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14

Multiple Choice

NOW They’re both moving towards each other: Puck A at 1 m/s and puck B at 2 m/s.


Calculate the momentum of each puck

1

pA = 2 kg⋅m/s

pB = 1 kg⋅m/s

2

pA = 1 kg⋅m/s

pB = 2 kg⋅m/s

3

pA = -1 kg⋅m/s

pB = 2 kg⋅m/s

4

pA = -2 kg⋅m/s

pB = 1 kg⋅m/s

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Multiple Choice

What is the total momentum of the system of both pucks?

1

ptotal = 2 kg⋅m/s

2

ptotal = 0 kg⋅m/s

3

ptotal = 1 kg⋅m/s

4

Can't tell

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Multiple Choice

What happens AFTER they collide?

1

Both stop moving

2

Both move together in the direction that puck B was moving, just slower

3

Puck B stops and puck A moves instead

4

Puck A moves to the right and puck B bounces back

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Multiple Choice

Now what if puck A is not moving again but I triple the mass of puck B (m=3kg)?


What is the total momentum of the system of both pucks?

1

ptotal = 3 kg⋅m/s

2

ptotal = 6 kg⋅m/s

3

ptotal = 2 kg⋅m/s

4

ptotal = 0 kg⋅m/s

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Multiple Choice

What is going to happen AFTER they collide?

1

Both stop moving

2

Both move together to the right, and A is faster than B

3

Puck B stops and puck A moves instead

4

Puck A stays put and puck B bounces back

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General Strategy

For solving ANY conservation of momentum problem

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Multiple Choice

What is the TOTAL momentum of the bat-ball system?

1

ptotal = 4.3 kg⋅m/s

2

ptotal = 30.9 kg⋅m/s

3

ptotal = 17.6 kg⋅m/s

4

ptotal = 13.3 kg⋅m/s

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Multiple Choice

AFTER the collision, the ball flies away with a speed of 45 m/s. How fast is the bat now?

1

v'bat = - 5.2 m/s

2

v'bat = - 11.45 m/s

3

v'bat = 1.95 m/s

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Multiple Choice

Energy due to motion is ____________ energy. 
1
Potential 
2
Energy
3
Kinetic
4
Friction

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Multiple Choice

The Law of Conservation of Energy states that
1
energy cannot be created nor destroyed, only transformed or transferred
2
energy can be destroyed but not created
3
energy can be created but not destroyed

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Multiple Choice

What's the equation for kinetic energy again?

1

12mv2\frac{1}{2}mv^2

2

mghmgh

3

mv2mv^2

4

mvmv

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Multiple Choice

Do you think KE is conserved in a collision, just like momentum is?

1

Yes

2

No

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In an Elastic Collision, we conserve

  • Momentum

  • Kinetic Energy

  • ALWAYS!!!!!!!!!!!!!!!!!!!!

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3. Conservation of Momentum Elastic

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