Question

By an experiment show that: static friction>sliding friction>rolling friction.​

Answer 1

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Answer 2

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Static friction- is the friction between a surface and an object at rest.

Sliding friction - is the friction between a surface and an object sliding over it.

Rolling friction- is the friction between a surface and a curved object sliding over it.

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Now when a body is at rest the friction acting on it is called static friction. Now in rest a body doesn't moves because of the resistive force applied by static friction. But when a force is applied on body the body starts moving and at an extent it comes to rest. Now sliding friction is responsible for bringing a moving object to rest.

Since static friction keeps the body in rest but sliding friction takes some time to bring body in rest. Thus static friction > sliding friction.

Now rolling friction only exists between a surface and an object having a curved surface like a cricket ball.

We know lower the friction faster the speed.

So, in static and sliding friction we saw that whole area of body is in contact with surface. But in rolling friction only a unit part of area is in contact with surface - You can observe attachment.

Since there is small area in contact thus the frictional force acts on this small area and not on whole body, like static and sliding friction, hence rolling friction is the lowest friction force.

Thus it can be verified that static friction >sliding friction > rolling friction.

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Final experiment :-

Suppose there are 2 cuboidal boxes and a wood log on a mountain. Suddenly a man releases them from slope of mountain. Now these object starts moving. The man observes that the wood log reaches the ground first and other two boxes after it. This happens because the wood log have a curved surface and thus rolling friction acts on it which is the least friction, thus it moves faster. And other two cuboidal boxes are acted upon by static friction and sliding Friction thus they move slow than log.

By thus experiment we can easily and confidently say that :-

STATIC FRICTION > SLIDING FRICTION > ROLLING FRICTION.

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BY√\_____________ SCIVIBHANSHU

THANK YOU

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