Define energy (for class 9)
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Energy is defined as the ability to do work.
the units of energy in CGS is erg and in SI is joule.
commercial unit of energy is kWh
Energy is also a scalar quantity.
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9
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Work done on an object is defined as the magnitude of the force multiplied by the distance moved by the object in the direction of the applied force. ... Work done on a body moving in circular path is zero. Energy. • The energy of a body is its capacity of doing work.
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