Question

Rolling friction is _____ sliding friction, if all other factors are the same.

• A. greater than
• B. less than
• C. same as
• D. none

Answer 1

The correct option is B less than

Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface.
More force is needed to start a body moving across a surface than is needed to keep it in motion once started. Thus the coefficient of sliding friction for a pair of substances is greater than the coefficient of rolling friction.