Fig. 3.1 shows a uniform rod AB acted upon by three equal forces F. F
F
A
B
F
Fig. 3.1
State two reasons why the rod is not in equilibrium.

For an object to remain in equilibrium, two conditions must be satisfied - both the net force and the net torque must be equal to zero. An example of an object in equilibrium is a rod that is free to rotate about a hinge at one end.

For equilibrium the net torque on the rod must be zero. So the 100N forces should on either side of the pivot point i.e. one on the left and one the right, and in same direction.