Momentum & Energy Review

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

A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball. 

• 55 kg*m/s
• 100 kg*m/s
• 250 kg*m/s
• 500 kg*m/s

Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...

• Skater 1 experiences a greater change in momentum

• Skater 2 experiences a greater change in momentum

• Skater 1 has a greater speed than Skater 2

• Skater 1 experiences a greater force

Two blocks begin at rest with an initial momentum of zero. After the spring is sprung, the two blocks move in opposite directions. What is the total final momentum? 

• zero
• a positive value in the direction of the heavier block
• a positive value in the direction of the faster block
• more information is needed

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

• 20000 N
• 20000 Joules
• 20000 Kg * m/s
• 20000 kg * m/s north

The total momentum before a collision is _________ the total momentum after a collision.

• equal to 
• less than 
• more than
• It depends on the type of collision

The impulse is ______ the change in momentum

• Greater than
• Equal to
• less than
• always double

A 10kg toy truck moves at +5m/s. It collides head-on with a 5kg toy car moving at -10 m/s. What is the total momentum of the system?

• 0 kgm/s
• 30 kgm/s
• 50 kgm/s
• 10 kgm/s

A car and bird are about to hit each other. Why will the bird suffer more damage?

• The bird has smaller mass, and so has bigger change in velocity.

• The bird experiences more force

• The bird is not moving as fast as the car

• The bird changes its momentum more