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