Friction, gravity, normal force, drag force, tension force and human force are the forces that occurs on free body.
There are large number of external forces acting on an object such as friction, gravity, normal force, drag force, tension force and human force due to pushing or pulling. These forces can cause the motion of the free body which is present at rest form or can stop a body which is moving. A free-body diagram is a useful means of describing and analyzing all the forces that act on a body to determine equilibrium.
So we can conclude that friction, gravity, normal force, drag force, tension force and human force are the forces that occurs on free body.
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