Question

Why static friction is self adjusting force?

Answer 1

$\Huge \bf{EXPLAINATION}}$

✿ Consider a body placed on the rough horizontal surface .The force of gravity is cancelled by normal reaction of the surface .

✿ When the body is pushed horizontally, the body moves and then stops this shows a retarding force is acting on the body .

✿ In general when a body slides on another body a retarding force tries to resist the motion of the body . This retarding force is called frictional force .

✿ If force is not applied, there is no frictional force. As the applied force increases, the frictional force also increases .

✿ When the direction of applied force is Reversed, the direction of friction is also reversed.

✿ Hence we can say that the Frictional force is Self adjusting force .

Answer 2

Static friction is recognised as a self-adjusting force because it wants the objects to remain at rest not move .

So if an external force is applied , the static friction force will be equal to the magnitude of the external force .