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Q.

Four children were asked to arrange forces due to rolling, sliding, and static frictions in decreasing order. Their arrangements are given below. Which of the following is the correct arrangement?


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a

Rolling > static > sliding

b

Rolling > sliding > static

c

Static > sliding > rolling

d

Sliding > static > rolling 

answer is C.

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Detailed Solution

Four children were asked to arrange forces due to rolling, sliding, and static friction in decreasing order. Their arrangements are given below. The correct arrangement will be static, sliding and rolling friction.
The force that resists the motion between any surfaces in contact is known as friction. There are four types of friction: static, sliding, rolling, and fluid. Static, sliding and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding friction, and then rolling friction, which is weakest. Fluid friction occurs in fluids, which are liquids or gases. Because it is simpler to move an object already moving than an object at rest, sliding friction for a given pair of surfaces is slightly less than static friction. Thus, static friction is larger than sliding friction and rolling friction.
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