Relate balanced and unbalanced forces to net forces

If the forces on an object are balanced, the net force is zero.

Explanation:

If the forces are unbalanced forces, the effects don't cancel each other. Any time the forces acting on an object are unbalanced, the net force is not zero, and the motion of the object changes.

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.