Q55 of 146 Page 147

What are the various forms of energy?

Various forms of energy are kinetic energy, potential energy, chemical energy, heat energy, electrical energy, light energy, heat energy and nuclear energy

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54

A force of 50 N acts on a body and moves it a distance of 4 m on a horizontal surface. Calculate the work done if the direction of force is at an angle 60o to the horizontal surface.

 55

Define the term ‘energy’ of a body. What is the SI unit of energy?

 55

Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.

 56

What do you understand by the kinetic energy of a body?