- #1

Game_Of_Physics

- 21

- 0

*m*and radius

*a*moving with velocity

*v*strikes a rigid surface at an angle θ to the normal. Assuming the ball skids while in contact with the surface, the tangential reaction force being a constant fraction μ of the normal reaction force, and assuming the perpendicular velocity of the ball is reversed, show that

- the ball is reflected at an angle Φ to the normal where |tanθ - tanΦ| = 2μ
- the angular velocity of the ball changes by an amount 5μvcosθ/a

Now the solution I have for this says that the ball can't skid if it is not rotating prior to colliding with the surface. I don't understand why this has to be the case. Could someone help explain why this is?

Thanks