State the meanings of the terms (a) rolling friction (b) fluid friction.
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If any things are roll with the help of friction this is called rolling friction
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(a)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. ... In analogy with sliding friction, rolling resistance is often expressed as a coefficient times the normal force.
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: ... Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other.
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