A solid sphere of uniform density starts from rest and rolls without slipping a distance of d = 4 m down a q = 28° incline. The sphere has a mass M = 5.2 kg and a radius R = 0.28 m.
1.) What is the magnitude of the frictional force on the sphere?
Suppose now that there is no frictional force between the sphere and the incline.
2. ) Now, what is the translational kinetic energy of the sphere at the bottom of the incline?