Statics. Static Equilibrium. There are three conditions for static equilibrium. The object is at rest There is no net force There is no net torque. Offset Forces. Balanced forces do not insure static equilibrium. The center of mass is stationary, but the object rotates. F. -F.
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Select the wall for the pivot.Pivot Point
FNF = mg
The downward force is multiplied by the lever arm of the stick to become a torque.
The torque on the rock matches the torque from the person.The Lever