Frictional force is something that tries to stop the movements of an object already resting in one condition. This is best understood with one example:
Suppose one solid block of mass or ‘m’ is resting on the rough surface, consider this picture:
Consider this figure:
That block of mass will reach equilibrium in this condition.
Let us find the equations to solve this:
First, ∑Fx= 0
P – F =0
F = p
Then, ∑fy= 0
N – mg = 0
N = mg
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