## Work energy theorem

## Intro

**Work energy theorem , work energy principle.**

According to this principle , work done by net force in displacement a body is equal to change in kinetic energy of the body.

Work energy theorem.

In everyday language , we often usebthe terms ' work' , ' Energy' , work energy theorem .a teacher is teaching a class , a student preparing for examination ,mom cooking foofd, a farmer ploughing the field ,all are said to be working. A person who can put in long hours of work is said to have large stamina or more energy. In karate or boxing , we talk work energy theorem , we shall see int his unit that the exact defination of the three terms are related at a great speed . Work energy theorem.

## Work . Work energy theorem basic

Work energy theorem

In physic ,work and energy have precise meaning , which must not be confused with there everyday meaning .for example , when we lift boxes of books onto library sheleves ,we have get tried and hungry .we need to eat food to get more energy . We define ,work W as the emergy tranferred to or from an object by means of a force acting on the object.

## Work is said to be done byba force when the body is displaced actually through some distance in the direction of the applied force.

### Infact ,work done by the force is the product of component of force in the. Direction of the displacment and the amgnitude of the displacment.

## W=(f cos)s

## 2.Energy

In the to day life , we use the term energy in many ways , work energy theorem , for example , a child who runs and plays long after adults are tried is said to be full of energy . When a person has lot of energy ,he can run faster or farther : he can jump higher and so on .

The concept of energy allows us to keep track of the changes that take place in a system . The system could be our body , our car , our home , the earth or even the universe . Some of the characteristics of energy are:

1.the entire matter possesss energy

2. Energy menifect in some many differnt forms

## Energy of the body as the capacity or ability of the body to do the work

Work energy theorem

**Retain in memory**

**1.**Whereas newtons second law is a realtion betwwen acceleration and force at any instant of time , work energy theorem involves over an interval of time.

**2.**Newtons second law in two. Or three dimensions is in vector form , but the work energy theorem is in scalar form.

**3.**In the above discussion , we have assumed that the work done by the force is effective only in changeing the kinetic energy of the body . It should ,however , be remembered that work done on a body may also be stored in the body in the form of poteniol energy

In this event , we shall say that work done = increase inPE of the body .

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