M3D7 Homework: Elastic and Inelastic Collisions

The law of conservation of momentum states that, 

• p before is less than p after
• p before is the same as p after
• p before is more than p after

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NGSS.HS-PS2-2

A 2.5 kg ball moving at 4.2 m/s collides with a 2.5 kg stationary ball. If the first ball is at rest after the collision, what is the velocity of the second ball? 

• 2.1 m/s
• 2.5 m/s
• 4.2 m/s
• 8.4 m/s

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NGSS.HS-PS2-2

Velocity is a vector which means it has which of the following?

• Direction

• Speed

• Magnitude

• Distance

What is an elastic collision?

• An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies is different.

• An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remains the same.

• An inelastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies remains the same.

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NGSS.HS-PS2-3

What is an inelastic collision?

• When two objects collide, becoming stuck together and internal kinetic energy is lost (but not really lost, it transfers to different forms of energy)

• When two objects collide, becoming stuck together and internal kinetic energy is lost

• When two objects don't collide, becoming stuck together and internal kinetic energy is lost (but not really lost, it transfers to different forms of energy)

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NGSS.HS-PS2-3

What two variables effect momentum?

• mass

• weight

• height

• Velocity

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NGSS.HS-PS2-2

What is the equation for momementum?

• $p=m\times v$

• $p=m\times a$

• $p=f\div a$

• $m=p\times v$

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NGSS.HS-PS2-2

2 balls collide and bounce off of each other. During the collision total momentum remained constant and total kinetic energy remained constant. What type of collision is this?

• Inelastic Collision

• Elastic Collision

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NGSS.HS-PS2-2

A piece of silly putty is dropped onto a skateboard as it rolls by. The putty sticks to the skateboard and moves the direction the board is moving. What type of collision is this?

• Inelastic collision

• Elastic Collision

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NGSS.HS-PS2-2

If a collision is elastic which of the following must be true?

• Momentum is not conserved

• The objects are in an open system

• The total momentum is equal to 0

• Momentum is conserved

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NGSS.HS-PS2-2