Practice for Momentum Online Quiz

An object moving or at rest resists changes to what it is doing. This is called:

• momentum

• impulse

• inertia

• acceleration

A measure of how difficult it is to stop an object’s motion is known as

• momentum

• impulse

• inertia

• acceleration

The change in momentum is known as

• momentum

• impulse

• inertia

• acceleration

A change in velocity is known as

• momentum

• impulse

• inertia

• acceleration

The law of conservation of momentum explains that the momentum after a collision

• is greater than the momentum before the collision

• is less than the momentum before the collision

• is the same as the momentum before the collision

• always equals zero

The best way to reduce force in a car wreck when impulse stays the same is to

• reduce the time it takes to stop

• increase the time it takes to stop

• increase momentum

• increase velocity

Two cars are driving down the street. The one traveling straight east has a momentum of 10,000 kg⋅m/s. The one traveling straight west has a momentum of 20,000 kg⋅m/s. They crash (they always do in physics, you know). What is the total momentum after the crash?

• 2 kg⋅m/s

• 10,000 kg⋅m/s

• 30,000 kg⋅m/s s

• 200,000 kg⋅m/s

A 2000 kg truck going 15 m/s slams into a 1000 kg car that is sitting at a light. What is the total momentum BEFORE the collisions?

• 75000

• 30000

• 15000

• 45000

A 2000 kg truck going 15 m/s slams into a 1000 kg car that is sitting at a light. What is the total momentum AFTER the collision?

• 75000

• 30000

• 15000

• 45000

A box with a mass of 0.2 kg traveling at 1.8 m/s hits a sidewalk and stops in 0.05 s. What is the force? Remember F=ma Remember, it's falling, so a=gravity

• 1.96 N

• 0.36 N

• 0.01 N

• 0.09 N