coefficient of restituion - lesson 4

Question 1

define the coefficient of restitution

Answer 1

the ratio of relative velocity (height of bounce) after impact to the relative velocity (height of drop) before the collision

Question 2

what does the COR measure?

Answer 2

measures the elasticity of the collision between an object and a given surface

Question 3

how is the COR measured

Answer 3

on a scale of 0>1

• COR of 1 = perfectly elastic collision
• COR of 0 = perfectly inelastic collision (stopping at the surface at which it collides)

Question 4

what is the formula for the COR?

Answer 4

√height bounced/height dropped

Question 5

what factors affect the COR?

Answer 5

equipment and materials

• the condition of the balls
• a type of equipment used
• type + condition of the playing surface

temp of balls
- increase temp = increase COR

the velocity of the collision

• velocity between the oncoming ball and swinging implement will alter COR
• increase velocity = increase the likelihood of ball losing energy due to greater compression of the ball – therefore increase velocity = decrease COR