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Machines and Work

A machine that moves an object does work on the object by applying a force on the object and moving it in the direction of the force.Work done W = F swhere F is the applied force and s is the distance moved in the direction of the force.

The output power of the machine P = F v

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Specification: AQA Physics (7407), AS-level, 3.4.1.7 Work, energy and power. Topic: Work, Energy and Power.

Key terms in this lesson

Spring constant: The force per unit extension needed to stretch a spring, equal to the gradient of a force-extension graph while Hooke's law is obeyed.
Tensile stress: The force applied to a material divided by its cross-sectional area.
Ultimate tensile stress: The maximum stress a material can withstand before it begins to fail; also called the breaking stress.
Plastic deformation: Deformation of a material beyond its elastic limit, so that it does not return to its original shape or length when the load is removed.

More in Work, Energy and Power

All 21 lessons in Work, Energy and Power · All AQA AS-level Physics topics