Question

Explain why rolling friction is less than sliding friction.

Answer 1

sliding friction consist more speed and more motion compare to rolling friction.

So,rolling friction is less than sliding friction.

hope it helps you..

Answer 2

• Rolling friction must always be less than sliding friction, because in order for an object to roll, the force of friction between it and the surface must be large enough to keep the object from sliding.
• Whenever one applies a sideways force trough the center of gravity of an object, that force has two components: 1) a direct force that tries to overcome friction and slide the object, and 2) a torque that uses friction to produce a rotation of the object by lifting its center of graA wide, flat object — like a board or a book — placed on its side will tend to slide, because the torque needed to raise the center of gravity over the leading edge is large compared to the force needed to overcome friction. The same wide, flat object place on its thin edge will tend to tumble (roll), because the torque needed to raise its center of gravity on that short edge is comparatively small.
• Thus rolling friction must always be less than sliding friction, by definition, because for an object to roll, the counter-force of friction that leads to torque must be smaller than the counter-force of friction that must be overcome for a slide.
• A wheel is a special case in which (ideally) the center of gravity of the object never needs to be lifted. Placed on a frictionless surface, a wheel will slide rather than roll, because some force must be applied to overcome the rotational inertia of the wheel, and the only place that force could come from is from friction with the surface. If the force needed to overcome friction and create a slide is ever smaller than the force needed to overcome the wheel’s rotational inertia, the wheel will not rollvity over the leading edge.