Question

a force having magnitude F is acting at an angle teeta with normal to surface of a cube having side a .the shear stress is

Answer 1

here is the answer

Ever turn too quickly and walk straight into a wall? I have. It hurts and makes me feel We can blame the normal force for the pain we feel when running into solid objects. The normal force is the force that surfaces exert to prevent solid objects from passing through each other.

Normal force is a contact force. If two surfaces are not in contact, they can't exert a normal force on each other. For example, the surfaces of a table and a box cannot exert normal forces on each other if they are not in contact