Q.4-Mark the direction of frictional force , and mention the kind of frictional force that comes into play ,in each case.

Friction always acts in an opposite direction of the motion of an object.
(Fig.a) , (Fig.b) -Static friction
(Fig.c) - Sliding friction.

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It is option is c as they have given that the force have the strength to push an object so in diagram 3it is shown that it is moving
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