Question

Define lubricant and rolling friction.

Answer 1

Answer:

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• "The substance which reduce friction are called Lubricants
• When no body rolls over the surface of another body, the resistance to it's motion is called rolling friction "

Answer 2

Any material used to reduce friction in this way is a lubricant. Much less force is required to roll an object than to slide or drag it. Unlike the coefficient of sliding friction, the coefficient of rolling friction varies with the rolling conditions. Rolling friction is very small compared with sliding friction.