College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 14

A ball of radius R and mass M rolls down an incline of angle . (a) For the ball to roll without slipping, should the tangent of the maximum angle of incline (tan ) be equal to (1) 3 µ s /2, (2) 5 µ s /2, (3) 7 µ s /2, or (4) 9 µ s /2 Here, µ s is the coefficient of static friction. (b) If the ball is made of wood and the surface is also wood, what is the maximum angle of incline [ Hint : See Table 4.1.]