Physics A.3 Work, Energy and Power

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7 Terms

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Conservation of energy

Energy cannot be created or destroyed, only transferred.

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Work

The transfer of energy that occurs when a force is applied to an object and the object is displaced in the direction of the force

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Sankey diagram

A scale diagram used to represent the total input, the useful output and the wasted output energies within a system

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Mechanical energy

In an object, the sum of the kinetic energy, gravitational potential energy and elastic potential energy.

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Power

The rate at which work is done or energy is transferred

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Efficiency

The ratio of useful energy output to total energy input

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Energy density

The amount of energy stored in a given system or region of space per unit volume