Question

how to find the direction of static friction force ???

Answer 1

To determine the direction of the force of static friction, think about the motion that would result if there were no friction. To start walking, you push back with your foot on the floor. Without friction, your foot would slide back, moving back relative to the floor   

Answer 2

Hey mate !!

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 force body diagram with respect to the other object 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 friction is opposite to the above Component of resultant force.

Thanku