Physics - Collisions

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

Kinetic energy is conserved __________ collisions.

• only in elastic

• only in inelastic

• in all

• never during

Momentum is conserved __________ collisions.

• only in elastic

• only in inelastic

• in all

• never during

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

• Elastic
• Inelastic
• Explosive
• Force

This picture is an example of ____________

• Elastic Collision
• Inelastic collision

True/False:  Elastic Collision causes a rebound.

• True
• False

Two objects with different masses collide and bounce back after an elastic collision. Before the collision, the two objects were moving at velocities equal in magnitude but opposite in direction. After the collision,

• the less massive object had gained momentum

• the more massive object had gained momentum

• both objects had the same momentum

• both objects lost momentum

Which of the following best describes the momentum of two bodies after a two-body collision if the kinetic energy of the system is conserved?

• must be less

• must also be conserved

• might also be conserved

• is doubled in value

If there is a perfectly inelastic collision, which of the following must be true?

• The total momentum of the system is 0

• The total kinetic energy of the system is conserved

• The objects stick together after colliding

• The total momentum of the system is not conserved

Due to friction, a purely _____ collision is impossible outside of a laboratory setting.

• Elastic
• Inelastic