Physics

Difference Between Mechanical Advantage And Efficiency in tabular form

Difference Between Mechanical Advantage And Efficiency

                  MECHANICAL ADVANTAGE                                   EFFICIENCY

Definition

It is the ratio of load and effort If a weight w is raised by a machine when effort P is applied Mechanical advantage  =It is the ratio between work done by the

machine (output) to the work done on the

I W machine (Input).

Efficiency      =

Machine Output

lf the mechanical advantage is greater than one, the machine will make our work easier.We can never et more work out of a machine than we put in Le. a machine cannot create any energy.

MCIIAN1CAL ADVANTAGE

Definition

The ratio between the load lifted and the effort applied is called the mechanical advantage of a machine.

MATHEMATICAL EXPRESSION

If W is the weight lifted by the machine and P is the effort applied to the machine, then

The weight lifted by the machine

 

Mechanical Advantage =

 

M.A =……………………………. (3)

 

Since mechanical advantage is the ratio between two forces, so it has no unit. It is expressed n numbers.

EFFICIENCY

The ratio between the useful work done by the machine (output) to the work done on the machine (input) is called efficiency.

 

Efficiency =

 

 

 

………………………… (4)

Efficiency is usually expressed in percentage.

 

Eff          =

 

The efficiency of a reel machine is always less than l.A perfect machine has 100% efficiency or 1

For an ideal machine

Efficiency    =      1

Or            =            1

Or output          =        input

 

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