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Work and Energy

Introduction

     For a layman the term 'work' implies any activity resulting in muscular or mental exertion.

Energy

     Energy is the capacity to do work. Energy is measured by the amount of work that a body can do. Therefore, SI unit of energy is also joule.

Momentum

     Momentum of the body is defined as the product of its mass and the velocity.

The Law of Conservation of Energy Equation

     Law of conservation of energy states that the energy can neither be created nor destroyed but can be transformed from one form to another.

Commercial Unit of Energy

     The SI unit joule is too small to express very large quantities of energy. Hence we use a bigger unit called kilowatt hour (kWh) to express energy.

Summary

     Law of conservation of energy states that energy can neither be created nor destroyed but can be transformed from one form to another.


Question and Answers

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Multiple Choice Questions

     



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