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Work, Power And Energy
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05/11/2021 4:28 pm
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(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 v and 2v respectively. Find the ratio of their kinetic energies.
1 Answer
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05/11/2021 4:34 pm
(a) Energy is defined as the ability to do work and joule is the SI unit of energy.
(b) Following are the various forms of energy:
Kinetic energy, potential energy, nuclear energy, electrical energy, chemical energy, sound energy, light energy, and heat energy.
(c) Let the mass of both the bodies be m
Velocity of body 1, v1 = v
Velocity of body 2, v2 = 2v
KE1 = \(\frac{1}{2}\) mv2 = \(\frac{1}{2}\) m(v1)2
KE2 = \(\frac{1}{2}\) mv2 = \(\frac{1}{2}\) m(v2)2
Ratio = KE1 : KE2 = \(\frac{1}{4}\)