Potential energy

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Potential energy
Mediaeval archery reenactment.jpg
In the case of a bow and arrow, when the archer does work on the bow, drawing the string back, some of the chemical energy of the archer's body is transformed into elastic potential-energy in the bent limbs of the bow. When the string is released, the force between the string and the arrow does work on the arrow. Thus, the potential energy in the bow limbs is transformed into the kinetic energy of the arrow as it takes flight.
Common symbols
PE, U, or V
SI unit joule (J)
Derivations from
other quantities

U = m · g · h (gravitational)
U = ½ · k · x2 (elastic)
U = C · V2 / 2 (electric)

U = -m · B (magnetic)