Consider an object of mass 50 kg at rest on the floor. A Force of 5 N is applied on the object but it does not move. What is the frictional force that acts on the object?

Explanation

When the object is at rest, the external force and the static frictional force are equal and opposite.
The magnitudes of these two forces are equal,`f_s = F_(ext)`
Therefore, the static frictional force acting on the object is `f_s = 5N`
The direction of this frictional force is opposite to the direction of `F_(ext)`