Energy Concepts and Units

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Energy

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A conserved substance with the ability to produce change in physical systems

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Joules

Back

SI unit of energy - N*m or kg*m

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First Law of Thermodynamics

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Total initial energy must equal the total final energy in a system

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Potential Energy

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Stored energy

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Gravitational Potential Energy

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Determined by the height and mass of the object and the gravitational force present

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Elastic Potential Energy

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Present in springs or elastics, based on a material's ability to be stretched or compressed and then return to original state

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Chemical Potential Energy

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Present in the bonds between atoms of a substance

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Kinetic Energy

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The form of energy an object possesses based on its motion

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Friction

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Transfers kinetic energy to the random motion of molecules.

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Work

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Energy exerted to provide a force through a distance