Pakistan study notes for Matric, Intermediate, B.A, B.COM BSC, M.A, BCS. Free Pakistani Urdu educational school, colleges and University notes.

CONDITIONS FOR DOING THE WORK

WORK:

When a force applied to a body and it covered a distance, then the body is said to perform work.

OR

The term work is the product of force and distance.

Mathematically:

If the applied force denoted by F and body covers S distance then the work is given by:

 

W = F x S

 

Unit:

Unit of work = unit of force x unit of distance

Unit of work = N x m

Unit of work = Joule (J)

 

In CGS system the unit of work is Dyne x cm = Erg

 

CONDITIONS FOR DOING THE WORK:

(i)         If force and displacement are in the same direction, work will be positive

 

Ø = 0

So,

Work = Fd cos Ø

W = Fd cos 0o

W = (F)(d)(1)

W = Fd

 

(ii)        If force and displacement are perpendicular to each other, work will be zero

Ø = 90o

So,

Work = Fd cos Ø

W = Fd cos 0o

W = (F)(d)(0)

W = 0

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