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.
(Fig.a) , (Fig.b) -Static friction
(Fig.c) - Sliding friction.