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Energy
The ability to do work.
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Work
A force applied over a distance. For formulae, see work done by a constant force parallel to displacement and work done by any constant force, and work done by a position-dependent force.
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Joule
The units of work, equivalent to a Newton-meter. Also units of energy.
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Kinetic Energy
The energy of motion.
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Power
Work done per unit time. For formulas, see Formula for average power, Definition of instantaneous power, and formula for instantaneous power.
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Watt
Unit of power; equal to joule/second.
Terms
Formulae
| Work done by a constant force parallel to displacement | W = Fx |
| Work done by any constant force | W = Fx cosθ |
| Work-Energy Theorem | W = ΔK |
| Formula for average power |  =  |
| Definition of instantaneous power | P =  |
| Formula for instantaneous power | P = Fv cosθ |
| Work done by a position-dependent force | W =  F(x)dx force.
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