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Law of conversation of energy says that energy can never be created or destroyed, only transformed into another form. The total amount of energy in the universe is constant.

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Daily energy use in different energy units

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Daily energy use in different energy units

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Systems change as energy flows and changes from one part of the system to another. Parts of the system may speed up or slow down, get warmer or colder, or change in other measurable ways. Each change transfers energy or transforms energy from one form to another.

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In physics the word work has a very specific meaning. Work is the transfer of energy that results from applying a force over a distance. Work is the force applied times the distance.
(work=force✖️distance)

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Radiant energy is energy that is carried by electromagnetic waves

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Nuclear energy is a form of energy stored in the nuclei of atoms (particles of matter.) Nuclear energy is transformed to heat that eventually escapes the Sun as radiant energy.

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Chemical energy is the form  of energy stored in molecules. Some examples of chemical energy are food , gasoline and batteries.

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Kinetic energy is the energy of motion. Kinetic energy can be easily converted into potential energy. The formula of kinetic energy is

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In physics, potential energy is the energy possessed by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.

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In physical science , mechanical energy is the sum of potential and kinetic energy. Mechanical energy is a form of energy that is related to motion or position.

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Energy describes the ability of things to change themselves or to cause changes in other things.Some examples of this changes are temperature, speed, position, pressure or any other physical variable. A joule (J) is the unit of measurement of energy.