Which among the following is a self-adjusting force?

Rolling friction

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Kinetic friction

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Static friction

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All of these

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Solution

The correct option is C Static friction
Static friction is a force that keeps an object at rest. It is a self adjusting force because it does not have any fixed magnitude, but will adjust itself according to the applied force, till it reaches its optimum value.
$0 < F_{s} \leq μ s N$
Here, $F_{s} = Force of static friction, μ s = Coefficient of static friction between the surface in contact and N = Normal reaction$

Hence, the correct answer is option (3).

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