1. The problem statement, all variables and given/known data A sphere is resting on a horizontal surface. A force parallel to the surface passing through the center of the sphere is applied. Describe the motion of the sphere 1. Without any friction 2. With friction. 3. The attempt at a solution When there's no friction, then the motion is purely translatory. But, if there is friction, it will apply a torque which will force rotation as well as translation. The second part isnt right though. Why?