Conservation of Energy

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20 Terms

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Energy

the ability to do work

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Thermal energy

Heat energy

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Solar energy

energy from the Sun; it can be converted into other forms of energy

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Electrical energy

the energy flowing in an electric circuit (source: batteries, generators)

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Mechanical energy

Kinetic energy + Potential energy

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Kinetic energy

the energy something has because it is moving

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Potential energy

the energy something stores because of position or shape

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Law of Conservation of Energy

Energy cannot be created or destroyed, but it moves around a lot

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Generator

a machine that changes one form of energy to another, especially mechanical energy into electrical energy; produces an electric current when a coil of wire wrapped around an iron core is rotated near a magnet

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Electrical circuit

the path through which electricity flows

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Work

requires energy to cause movement

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Joule

unit of energy or work

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formula for potential energy

mass x gravity x height (mgh)

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formula for kinetic energy

1/2mv^2

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9.8 m/sec^2

value for gravity on earth

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Kinetic energy if somehting isn't moving

Zero

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E=mc^2 means that

energy and mass are related

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formula for conservation of mechanical energy

In a closed system, The Potential energy + Kinetic energy at the beginning = Potential energy + Kinetic energy at the end

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Comparing potential and kinetic energy

The kinetic energy can't go higher than the potential energy

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If potential energy is higher than the measured kinetic energy

Some energy must have gone into overcoming friction, sound, or other paths.