Unit 1 Review 2 Impulse and Momentum

Collisions where objects BOUNCE apart.

• inelastic collisions

• elastic collisions

• explosions

• none of these

Momentum before = Momentum after

according to the Law of Conservation of _______________.

• Momentum

• Energy

• Force

• Acceleration

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NGSS.HS-PS2-2

For every action, there is an equal and opposite reaction.

• Newton's 1st Law

• Newton's 3rd Law

• Newton's 2nd Law

• Law of Momentum

Which TWO variables determine the MOMENTUM for an object?

• time

• density

• velocity

• mass

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NGSS.HS-PS2-2

Action: Your foot applies a downward force onto the floor.

Reaction?

• Your foot pushes through the floor.

• The floor applies an equal and opposite force upward on your foot.

• Your foot bounces off of the floor.

• The floor collapses.

 

A car has 10,800 kg m/s of momentum as it collides with a trash dumpster AT REST. How much TOTAL MOMENTUM will the car and dumpster have after collision?

• Less than 10,800 Kg x m/s

• More than 10,800 Kg x m/s

• The same. 10,800 Kg x m/s

• Not enough information.

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NGSS.HS-PS2-2

 

An insect applies 1.5 N of force to a windshield of a moving car. How much force does the windshield apply to the insect?

• 15,000 N

• 0.5 N

• 1.5 N

• Not enough information

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NGSS.MS-PS2-1

"Mass in motion" is one definition for:

• momentum

• impulse

• power

• impact

Answer explanation

The formula for momentum is

$p\ =\ m\cdot v$

Mass x Velocity is "mass in motion".

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NGSS.HS-PS2-2

A change in momentum from applying a force for a certain time is:

• momentum

• impulse

• power

• impact

Answer explanation

The formula for impulse is

$J\ =\ F\cdot t$
Impulses create changes in momentum.

The equation for momentum is:

Answer explanation

Remember: Momentum is "mass in motion" so the equation needs to have mass and velocity (motion).

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NGSS.HS-PS2-2