Unit 4 Test Review

Front

What do two objects experience when they collide or explode?

Back

The same force for the same amount of time.

Front

What does the Law of Conservation of Momentum state?

Back

The total momentum before a collision is equal to the total momentum after a collision.

Front

How do you calculate momentum?

Back

Momentum = mass × velocity.

Front

What is the momentum of a 0.250 kg cart moving at 0.400 m/s?

Back

0.1 kg-m/s.

Front

What is the purpose of crumble zones on a car?

Back

To increase the time of impact.

Front

Was work done if a 55 kg runner increases her speed from 5 m/s to 8 m/s?

Back

Yes.

Front

What is impulse?

Back

Impulse is the change in momentum, calculated as force multiplied by the time over which the force acts.

Front

What happens to momentum in a closed system during a collision?

Back

Momentum is conserved.

Front

Define kinetic energy.

Back

Kinetic energy is the energy of an object due to its motion, calculated as KE = 1/2 mv².

Front

What is the formula for calculating work done?

Back

Work = force × distance.