What conditions are needed for static friction to come into play?

Conditions required for static friction to come into play are:

1. A force needs to be applied to the object being considered.

2. The applied force should not be able to move the object. It should be less than maximum static friction.

Consider an object M of mass m kg. Consider a force F acting on the object.

In the above figure, F_a is the frictional force on the object.

For static friction to exist, F_a>F.