Elastic and Inelastic Collisions

Collisions where objects BOUNCE apart.

• inelastic collisions

• elastic collisions

• explosions

• none of these

Joe is trying to tackle Carson while Carson is standing still. Joe is running at 15 m/s and has a mass of 32 kg. Carson has a mass of 64 kg. What is their final velocity, assuming this is a perfectly inelastic collision? (do not write units)

2 balls collide and bounce off of each other. During the collision total momentum remained constant and total kinetic energy remained constant. What type of collision is this?

• Inelastic Collision

• Elastic Collision

• Perfectly Inelastic Collision

• No collision occurred

A BMW rear ends a car at the stop light. Neither car sticks together. The momentum was conserved in the collision but the kinetic energy was not conserved. What type of collision is this?

• Elastic Collision

• Inelastic Collision

• Perfectly inelastic Collision

• No Collision

If a collision is elastic which of the following must be true?

• Momentum is not conserved

• The objects are in an open system

• The total momentum is equal to 0

• Kinetic Energy is conserved

A car has 10,800 Kg x m/s of momentum as it collides with a trash dumpster AT REST. How much TOTAL MOMENTUM will the car and dumpster have after collision?

• Less than 10,800 Kg x m/s

• More than 10,800 Kg x m/s

• The same. 10,800 Kg x m/s

• Not enough information.

Two ice skaters push off from each other on a frictionless ice rink. If one skater has a mass of 50 kg and the other has a mass of 70 kg, what can be said about their velocities after the push?

• Both skaters will have the same velocity.

• The 70 kg skater will have a higher velocity.

• Velocity cannot be determined without more information.

• The 50 kg skater will have a higher velocity.

In a perfectly inelastic collision, which of the following is true?

• Momentum is conserved, but kinetic energy is not.

• Both momentum and kinetic energy are conserved.

• Kinetic energy is conserved, but momentum is not.

• Neither momentum nor kinetic energy is conserved.

Two identical cars collide head-on and come to a complete stop. What type of collision is this?

• Perfectly Inelastic Collision

• Elastic Collision

• No Collision

• Inelastic Collision

In a collision where two objects stick together, which of the following is true about the kinetic energy?

• Kinetic energy is gained.

• Kinetic energy is lost.

• Kinetic energy remains unchanged.

• Kinetic energy is conserved.