Skeleton Biomechanics: Bones as Levers

This is a simplified, flat side-view lever diagram of the same real biomechanics as the 3D model: a joint (fulcrum), a muscle pulling at some distance from it (effort), and a resisting weight acting at another point along the bone (load). Switch between the three real lever classes the human body uses — a neck joint, a calf-raise ankle, and a bicep-curl elbow — and drag the effort or load markers, or use the sliders, to see the required muscle force recompute live from genuine torque balance. Pan by dragging empty space and zoom with the scroll wheel to inspect the diagram closely.