Question

Direction of static friction..plz explain in detail

Answer 1

it comes into play when a body is at rest. for moving a body the force must be to overcome the static frictional force.

Answer 2

The static Friction force on an object is opposite to its impending motion relative to the surface.

Following steps should be followed in determining the direction of static friction force on an object.

• Draw the free body diagram with respect to the other direction on which it is kept.
• Include pseudo force also if contact surface is accelerating.
• Decide the resultant force and the component parallel to the surface of thus resultant force.
• The direction of static friction is opposite to the above Component of resultant force.

Note :- Here once again the static friction is involved when there is no relative motion between two surfaces.