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Engine Power

The power supplied by a car engine is known as engine power or motive power.When a powered object moves at constant velocity at constant height, the resistive forces are equal and opposite to the motive forces.

P = F v

motive power = force × velocityMotive Power:

energy per second wasted due to resistive force

gain of kinetic energy per second

The work d is given by:

W = F s

work done = output force × displacementWhen a powered object gains speed the output force exceeds the resistive forces on it.

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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

Hooke's law: The extension of a spring or wire is directly proportional to the force applied, provided the limit of proportionality is not exceeded.
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.

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