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

Important Terms Of Machines


Any device which help us in doing work in a convenient manner known as machine.


Important Terms:


1.         Effort:        The force applied to machine to do work on the machine is known as effort. It has symbol of ‘P’

Unit:   Since effort is a force so it has the same unit as force Newton.

2.         Load:                         The weight lifted or overcome by the machine is known as load. It is represented by the symbol ‘W’.

Unit:   Newton


3.         Mechanical Advantage:    The ration of load raised by a machine after applying some effort is known as Mechanical Advantage.

It is represented by the symbol M.A.


 M.A = Load / Effort = W/P

Unit: Since it is a ration so it has not unit.

4.         Input:

The work done on a machine by an effort is known as input.


Input = Effort x Distance though which effort is applied on the body.


5.         Output:          If a machine moves a load W through a distance h then useful work done by machine is called as output.

Formula:       Output = Load Distance through which load moves


6.         Efficiency:    The ratio between the output and input on a machine is called efficiency.


Efficiency = Output / Input x 100


7.         Ideal Machine:         A machine that converts all the amount of input into useful output or a machine that has 100% efficiency is known as ideal.


For an ideal machine                        Input = Output

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