1. A lever is a rigid stick balanced across a fulcrum F, as shown in Figure...
1. A lever is a rigid stick balanced across a fulcrum F, as shown in Figure 1. Mass m hangs a distance L from the fulcrum, and mass m' hangs a distance I/ from the fulcrum. Suppose for the sake of argument that the mass of the lever itself is negligible. In equilibrium the masses arranged in this way will balance each other, and the lever is motionless. To achieve this, the lever must exert a set of complicated forces of constraint. But, thanks to Monsieur d'Alembert, we need not concern ourselves with these forces. Using d'Alembert's principle of virtual work, derive the condition for equilibrium for this lever. LF