Coefficient of Restitution

Question 1

what is the COR

Answer 1

• Measures the elasticity of the collision between an object and a given surface
  
  • It measures how much energy remains in the object after a collision occurs
    Elasticity is a measure of how much rebound exists following a collision.
    COR is a scale from 0-1 where 1 is perfect and 0 is none

Question 2

factors affecting COR

Answer 2

equipment and surfaces
velocity
temperature

Question 3

equipment and surfaces

Answer 3

○ Condition of the balls
§ New tennis ball has a high COR while an old tennis ball has a low COR
○ Type of equipment being used
§ Wooden bats are compulsory in baseball as aluminium bats have a higher COR
○ Type and condition of surfaces
Clay court has high COR vs wooden court has low COR

Question 4

velocity

Answer 4

○ Velocity between the oncoming ball and the swinging implement will alter the COR
§ Increasing the velocity increases the likelihood of the ball loosing energy due to the greater compression of the ball
An increased velocity means a decreased COR

Question 5

temperature

Answer 5

○ An increase in the temperature of the balls result in an increase in the COR
In squash the bounciness of a ball changes a lot depending on the temperature of the court