Elastic & Inelastic Collisions

(p. 206) What is the difference between the two examples of collisions in the first paragraph on p.206?

The total momentum remains _________ in any type of collision.

Why is the total kinetic energy generally not conserved in a collision? (p.206)

"a collision in which two objects stick together after colliding" (p.206)

• elastic collision

• perfectly elastic collision

• perfectly inelastic collision

• imperfectly inelastic collision

A blitzing linebacker wraps up the quarterback and tackles her to the ground. What type of collision is this? (p.206)

• elastic collision

• perfectly elastic collision

• perfectly inelastic collision

• imperfectly inelastic collision

In a perfectly inelastic collision, the final mass is equal to ______________________________. (p.207)

Why are perfectly inelastic collisions easy to analyze in terms of momentum? (p.207)

Look at Figure 3.2 on p. 207. Is the total momentum of the two cars before the collision equal to the total momentum of the two cars after the collision? (p.207)

• yes

• no

Type the simplified version of the equation for conservation of momentum that is useful in analyzing perfectly inelastic collisions: (p.207)

Look at Sample Problem E on p. 207. What is the final velocity of the two entangled cars described in the problem?

• 7.59 m/s

• 22.0 m/s

• 0 m/s

• 9.75 m/s