chapter 13

Question 1

how do you have the greatest change in velocity after impact of:

• object
• person

Answer 1

• object: use heaviest implement w/o sacfricing velocity

- person: increase mass and/or velocity (both)

Question 2

what is the coefficient of restitution

Answer 2

measurement of elasticity btwn two objects

-always acts perpendicular to surface in contact)

Question 3

describe system when

• e=1
• e=0

Answer 3

• e=1: completely elastic, velocity before = velocity after

- e=0: inelastic, velocity after = 0 which means objects stuck together

Question 4

what is the law of impact

Answer 4

two bodies move toward each other in same straight line so diff btwn velocities after impacts directly related to diff btwn velocities before impact

Question 5

how would you measure e for direct impact w/ fixed surface

Answer 5

measure vertical distance before and after

Question 6

facors affecting angle of reflection
4 of them
-what would happen if no factors were influencing it?

Answer 6

• angle of incidence
• friction
• coefficient of restitution
• spin of ball

-angle of incidence and reflection would be the same

Question 7

what is the horizontal velocity after impact affected by

3 of them

Answer 7

• angle of incidence: increase = increase velocity
• friction: velocity after < velocity before
• spin: back spin = increase friction, top spin = decrease friction

Question 8

what is the vertical velocity after impact affected by

2 of them

Answer 8

• angle of incidence: increase = decrease velocity

- coeff of restitution: decrease = decrease velocity