Momentum Review

What is the definition of momentum?

• The force an object has when moving.

• How difficult it is to stop a mass in motion.

• The energy of a moving object.

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NGSS.HS-PS2-2

What is the formula for momentum?

• p = mΔv

• p = Ft

• p = mv

• p = m/v

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NGSS.HS-PS2-2

The units of momentum are

• kg*m*s

• kg*m/s

• kg/m/s

• N/s

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NGSS.HS-PS2-2

A 2 kg cat lands on a table with a velocity of 3 m/s. What is the momentum of the cat as it is landing?

• 0 kg m/s

• 1.5 kg m/s

• 0.66 kg m/s

• 6 kg m/s

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NGSS.HS-PS2-2

If you double the original speed of a moving object, the momentum of the object will

• remain the same

• be cut in half

• doubles

• triples

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NGSS.HS-PS2-2

What is the conservation of momentum?

• There are equal and opposite forces during collisions and explosions.

• Momentum of a system is the same before and after a collision/explosion.

• Energy is conserved during collisions and explosions.

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NGSS.HS-PS2-2

Why is it important to not stand behind a cannon when firing a cannonball?

• Because it has more mass and moves faster than the ball

• Because of recoil.

• Because the change of momentum of the ball will be different if not.

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NGSS.HS-PS2-2

In Case A a car moving at 5 m/s hits a wall and bounces back at 4 m/s. In Case B the car hits at 5m/s and stops. In which case is the impulse greater?

• Case A

• Case B

• Both the same.

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NGSS.HS-PS2-2

What is the momentum of a 2000 kg vehicle that has reached 5 m/s West in 4 seconds?

• 500 kg-m/s West.

• 400 kg-m/s West

• 2500 kg-m/s West.

• 10,000 kg-m/s West.

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NGSS.HS-PS2-2

When is the kinetic energy of a system conserved?

• During an elastic collision.

• During an inelastic collision.

• During explosions.

• During all the above.