CA3Week3

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

The momentum of an object depends upon the object's ___________&_____________.

• size and shape

• mass and speed

• mass and veloctiy

• mass and energy

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

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.

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

Which of the following has the least amount of momentum?

• An ant walking along the ground
• An ant at rest
• An elephant walking
• An elephant running

An impulse depends on

• weight and force

• force and time

• electric charge and time

• none of these

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.
Calculate the impulse on the ball.

• 1 N.s
• 6 N.s
• 66 N.s 
• None of these

The purpose of crumble zones on a car is to

• decrease time of impact.
• increase force of impact.
• increase the time of impact.
• decrease the impulse during impact.