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Energy

In physics, energy is that the quantitative property that has got to be transferred to an object so as to perform work on, or to heat, the thing. Energy may be a conserved quantity; the law of conservation of energy states that energy are often converted in form, but not created or destroyed. The SI unit of energy is that the joule, which is that the energy transferred to an object by the work of moving it a distance of 1 metre against a force of 1 newton. Common sorts of energy include the K.E. of a moving object, the P.E. stored by an object's position during a field (gravitational, electric or magnetic), the elastic potential energy stored by stretching solid objects, the energy released when a fuel burns, the energy carried by light, and therefore the thermal energy thanks to an object's temperature.

Mass and energy are closely related. thanks to mass–energy equivalence, any object that has mass when stationary (called rest mass) also has the same amount of energy whose form is named energy , and any additional energy (of any form) acquired by the thing above that energy will increase the object's total mass even as it increases its total energy. For instance, after heating an object, its increase in energy might be measured as a little increase in mass, with a sensitive enough scale. Living organisms require energy to remain alive, like the energy humans get from food. Human civilization requires energy to function, which it gets from energy resources like fossil fuels, fuel, or renewable energy. The processes of Earth's climate and ecosystem are driven by the energy Earth receives from the sun and therefore the heat contained within the world.

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