55. (a) Define the term 'energy' of a body. What is the SI unit of energy. (b) What are the various forms of energy? (c) Two bodies having equal masses are moving with uniform speeds of van of their kinetic energies. stand by the kinetic energy of a body ?
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(a) Energy can be defined as the ability to do work. The SI unit of energy/work is the joule (J)
(b) Energy exists in many different forms. Examples of these are light energy, heat energy, mechanical energy, gravitational energy, electrical energy, sound energy, chemical energy, nuclear or atomic energy, and so on.
(c)Let the masses of the two bodies be (m1) = m kg and (m2) = m kg .
Velocity of the first body, (v1) = v m/s
Velocity of the first body, (v2) = 2v m/s
The required ratio is = Kinetic energy 1/Kinetic energy 2
The ratio of K.E is, K.E of body 1 : K.E of body 2 = 1 : 4.
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