For an object to remain in equilibrium, both the net force and the net torque must be equal to zero.
ΣF = 0 Στ = 0
Consider the hinged rod. It is held horizontally, with the torque due to gravity being balanced by the torque from a force with a vertical component applied at some point along the rod.
What happens when the upward force F is moved to the right? To maintain equilibrium:
What happens to the hinge force when F is moved to the right? To maintain equilibrium: