Momentum and Impulse

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

Tags

NGSS.HS-PS2-2

Softer landings tend to

• increase impact force

• increase force

• increase collision time

• increase change in momentum

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NGSS.HS-PS2-3

Here we can see the impulse equation. We should read this as:

• Impulse = change in momentum

• Momentum = change in impulse

• Feet = triangle m-vee

• Force = Impulse

Tags

NGSS.HS-PS2-2

If we apply an impulse to an object

• it will always speed up.

• it will always slow down.

• it will experience a change in momentum.

• the mass of the object will change.

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NGSS.HS-PS2-2

Clearly it is safer to drive a moving car into a mound of hay rather than into a bare concrete wall. Which explanation is best as to why this is so.

• The impulse occurs over a longer time period but with a lower force.

• Less momentum is lost when driving into hay.

• There is less impulse when driving into hay.

• There is a greater change of momentum when driving into concrete.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

The difference between a car hitting a wall vs. a car hitting a hay stack is

• the Impulse on the car hitting the wall is greater

• the change in momentum of the car hitting the wall is greater

• the force on the car hitting the hay stack is greater

• the collision time of the car hitting the hay stack is greater

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

The purpose of crumble zones on a car is to

• decrease time of impact.

• increase force of impact.

• increase the time of impact.

• decrease the impulse during impact.

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NGSS.HS-PS2-1

NGSS.HS-PS2-3

The units for Impulse are

• N/s
• N.s
• N
• m/s

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?

Impulse = F t

• Cart B

• Cart A

• they are the same

Tags

NGSS.HS-PS2-1

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.

Calculate the impulse on the ball.

• 1 N.s

• 6 N.s

• 66 N.s

• None of these

Tags

NGSS.HS-PS2-1