MA, VR & Efficiency || Relationship || Simple Machine || Class 8 & 9 || Explained in Nepali

MA, VR & Efficiency || Relationship || Simple Machine || Class 8 & 9 || Explained in Nepali
𝐄𝐟𝐟𝐢𝐜𝐢𝐞𝐧𝐜𝐲( "η " )= (𝐎𝐮𝐭𝐩𝐮𝐭 𝐰𝐨𝐫𝐤)/(𝐈𝐧𝐩𝐮𝐭 𝐰𝐨𝐫𝐤) 𝐱 𝟏𝟎𝟎 %
The machine without friction during its operation is called an ideal machine (or perfect) machine.
In such a machine, the output work is always equal to the input work.
The machine with friction during its operation is called an practical machine.
In such a machine, the output work is always less than the input work.
A machine cannot be 100% efficient because of the following reasons:
A part of the work done or energy supplied to the machine is wasted in overcoming the friction between the movable parts of the machine.
A part of work done or energy supplied to the machine is wasted in moving the parts of the machine.
Please note that no machine is weightless.
Therefore, the efficiency of a practical machine is always less than 100%.
A machine has 80 % efficiency means that 80% of the input work is converted to useful output work & the remaining 20% of the input work is wasted to overcome the friction & to move the parts of the machine.



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