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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With no rotation, torques must sum to zero.
A ladder leans against a wall with friction against the floor.
Coefficient of static friction m
The sum of torques gives
FNF = mg
The calculation of torques is independent of the pivot point.
Select the wall for the pivot.
FNF = mg
The lever is a simple machine that increases force.
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.