Lifting Machines on the Job – Work, Power, Efficiency

PhysicsEnergy & MomentumAges 15–16

A construction-site crane, a farm hoist, or a passenger lift raises a load to height h. Adjust the mass, height, lifting speed, and friction loss to see the useful work A = mgh, the total work, the power P = F·v, and the machine's efficiency — the very quantities an operator must calculate when choosing a machine.