This energy transfer equals force multiplied by displacement in the force's direction.

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Mechanical work involves a force acting through a displacement. Source: Work (physics) ↗

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15This physical quantity is the rate of doing work.RECALL
Power
Measured in watts
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16This ratio compares useful energy output with total energy input.RECALL
Efficiency
Usually expressed as a percentage
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17Stretching an ideal spring stores this type of energy.RECALL
Elastic potential energy
It depends on stiffness and extension
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