When two surfaces are coated with a lubricant, then they
Stick to each other
Slide upon each other
Roll upon each other
None of these
(b)Surfaces always slide over each other.
A car is moving with uniform velocity on a rough horizontal road. Therefore, according to Newton's first law of motion
A body of mass $2 \,kg$ is kept by pressing to a vertical wall by a force of $100\, N$. The coefficient of friction between wall and body is $0.3.$ Then the frictional force is equal to …….. $N$
Write unit of coefficient of static friction.
A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is
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