Intro to Momentum

Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?

• car
• bike
• they are equal
• cannot determine using the info provided

Determine the momentum of 1000-kg car moving southward at 20 m/s......... 

• 20000 N
• 20000 Joules
• 20000 Kg * m/s south
• 10000 kg * m/s south

When the speed of an object is doubled, its momentum

• remains unchanged in accord with the conservation of momentum.
• doubles
• quadruples
• decreases

Which object listed below has the greatest momentum?

• A 0.05 kg object rolling at 0.2 m/s.
• A 0.15 kg object rolling at 2 m/s.
• A 0.15 kg object rolling at 1 m/s
• A 0.4 kg object rolling at 2 m/s.

Momentum is conserved in this type of collision

• elastic
• inelastic
• momentum is conserved in both types of collisions

In an elastic collision, ______ is conserved.

• Momentum only

• Kinetic Energy only

• Both momentum and energy

In a perfectly inelastic collision, ______ is conserved. 

• Momentum only
• Kinetic Energy only
• Both momentum and kinetic energy

Which of the following collisions is not perfectly elastic nor perfectly inelastic?

• a football tackle where both players fall wrapped together
• a cue ball hitting a billiards ball
• a flower pot breaking over someone's head
• an arrow staying in the apple after impact

Jorge noticed a collision outside the coffee shop where two cars collided and stuck together.  What type of collision did he observe?

• Elastic
• Inelastic
• Completely inelastic
• none

While playing pool, Emma notices that the pool balls bounce apart.  What type of collision is this?

• Elastic
• Inelastic
• Explosive
• Force