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Example of Rolling Friction

Rolling friction describes the process of resistance applied to a rolling object like a ball. Because the rolling ball isn't in constant direct contact with the source of the resistance, the effect of rolling friction is cumulative and variable, depending on the nature of the contact with the source.

Examples of Rolling Friction:

A ball rolling along grass, for example, will be in variable contact which ultimately slows it down, but the type of contact is erratic.
A pool ball on a pool table mat experiences rolling friction in the form of the mat, and its contact with other pool balls.
http://webphysics.davidson.edu/faculty/dmb/py430/friction/rolling.html

Image Example of Rolling Friction:

A needle roller bearing.

A roller bearing.