Q.3. Define the following terms and write their units (both SI and CGS).
(a) energy?
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In CGS system the unit of length, mass and time are centimetre (cm), gram (g) and second (s), respectively. In SI system the unit of length, mass and time are metre (m), kilogram (kg) and second (s), respectively.
The SI unit for energy is the Joule, or J. ... The cgs unit for energy is the erg. 1 erg = 1 g·cm2/s2.
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energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed
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