Load arm & effort arm

One cube, two lever types — a small force on a long arm.

Settings & explanation

Load F_L120 N

Load arm l_L1.0 m

Effort arm l_K3.0 m

Applied effort F_K40 N

At g = 9.81 m/s², 40 N is the weight of about 4.1 kg; 40 kg weighs about 392 N. The kg value beside the pulling force is an equivalent mass, not the figure’s mass. Ideal lever with a weightless beam. F_K · l_K = F_L · l_L. Both forces act vertically; motion is damped and limited to ±20°. Arm lengths are measured along the beam.

Live values & equilibrium

Equilibrium · 40 N holds the load

To hold: 40 N × 3.0 m = 120 N × 1.0 m