Work,power and Energy

Whenever a force acts on a body,and the body undergoes some displacement,then work is said to be done.e.g.,if a force P, acting on a body, causes it to move through a distance s .
Then work done by the force P=Force X Distance
                                                 =p x S
sometimes,the force p does not act in the direction of motion of the body,or in other words,direction of motion of the body,or in other words,the body does not move in the direction of the force
Then work done by the force P
                                                = component of force in the direction of motion X Distance 
                                                = P cos θ X s
UNIT OF WORK

We have already discussed that the work is the product of force and distance,through which the body moves due to action of the force.Thus the units of work depend upon the units of the force and distance.The units of work(or work done) are:
1.One N-m.It is the work done by a force of 1 N,when it displaces the body through 1 m.It is called joule(briefly written as J),Mathematically.
                                                    1 joule=1 N-m
One kN-m.It is the work done by a force of 1 kN,when it displaces the body through 1 m.

It is also called kilojoule(briefly written as kj).Mathematically.
                                              1 kilo-joule=1 kN-m