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When something happens, energy is changed from one form into another. When you climb stairs, chemical energy in your food is changed into kinetic energy by your muscles, and into potential energy as you raise your body against gravity. The amount of energy transferred is measured in JOULES.
When something has energy, it can do work and bring about change. Energy produces light and movement. Energy is required to produce heat, to generate electricity, and to overcome forces such as friction. It can makes a lot of changes

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