STATE THE DIFFERENCES BETWEEN STATIC FRICTION AND ROLLING FRICTION
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Main Difference
Sliding friction and rolling friction are both types of resistive forces that oppose an object’s motion along a surface. The main difference between sliding and rolling friction is that the sliding friction occurs when one surface is rubbing against another surface, whereas rolling friction occurs when an object is rolling on another surface.
What is Sliding Friction
Sliding friction (kinetic friction) is the force of friction between two surfaces which are rubbing against each other. Sliding friction is a consequence of having small protrusions on a surface. Whenever the two surfaces are moving against each other, the protrusions interlock and work needs to be done to keep the objects in motion.
Sliding friction between two surfaces is given by:
Where stands for the coefficient of kinetic friction between the two surfaces, and is the normal contact force between the surfaces.
What is Rolling Friction
Rolling friction occurs when the surface of one body is rolling against the surface of another body. The origin of this force is the deformations that occur on the surfaces as rolling occurs. Hysterisis is a main contributor: the energy given out when the surfaces recover their shape after a deformation is less than the energy that went in to create those deformations in the first place.
Analysing rolling friction is more complicated than analysing sliding friction. However, using a coefficient of rolling friction such that rolling friction is given by
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