One small push. One heavy lift.

Ideal static equilibrium: F × effort arm = m × g × load arm. The fulcrum is the pivot. The blue load has mass m, the orange downward force is F, and g = 9.81 m/s².

Mechanical advantage = effort arm / load arm. Ideal displacement trade-off: effort travel / load travel equals the same ratio for small rotations.

Assumptions: massless rigid beam, frictionless fulcrum, forces perpendicular to the beam, no acceleration. The motion is illustrative, not a dynamic rigid-body simulation. Real levers need additional force to overcome friction and beam weight. Numbers are ideal approximations.