Momentum, Impulse, and Collisions

In an elastic collision, ______ is conserved.

• Momentum only

• Kinetic Energy only

• Both momentum and energy

Most modern vehicles have padded dashboards. This reduces collision injuries by...

• reducing the driver's change in momentum
• increasing the driver's change in momentum
• increasing the force of impact
• increasing the time of impact

In a perfectly inelastic collision, ______ is conserved. 

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

A person on a stationary skateboard throws a bowling ball with a velocity of 5.0 m/s. What is a possible speed of the person after the throw? 

• 0 m/s
• 1.5 m/s
• 5.0  m/s
• 7.5 m/s

The recoil speed of a rifle is much less than the exit velocity of a bullet because...

• the rifle experiences a smaller force
• the rifle experiences a smaller change in momentum
• the rifle has a much greater mass
• the rifle does not obey the laws of physics

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

What happens to the speed of the wagon as the rain collects inside of it?

• it decreases
• it remains constant
• it increases

A block sliding on a frictionless surface runs into a second block of equal mass at rest. After the two collide, they stick together and travel with a velocity...

• that is twice the magnitude of the original velocity
• that is half the magnitude of the original velocity
• more information is needed

Parkour Peter bends his knees upon landing in order to ____

• reduce his change in momentum
• increase his change in momentum
• increasing his landing time
• increasing his landing force