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प्रश्न
State two reasons, why the efficiency of a pulley system is not 100 percent?
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उत्तर
The two reasons are:
(i) Some effort is used (or wasted) in overcoming the friction between the string and the grooves of the pulleys.
(ii) Some effort is used up (wasted) in lifting up the movable block along with the load.
On account of the above two reasons, effort applied is always more than the load lifted up and so the M.A. is always less than 1. Hence efficiency is always less than 100%.
संबंधित प्रश्न
The pulley system has drawn lifts a load of 150 N when an effort of 60 N is applied. Find its mechanical advantage.
Answer the following in detail.
How does a pulley make work simpler?
Name a machine to change the direction of force ?
Explain the working of a gear system.
Define the following term in reference to a gear system of Driving gear ?
Define the following term in reference to a gear system for Gain in speed ?
Define the following term in reference to a gear system for Gain in torque ?
What should be the gear ration of a car : equal to 1, less than 1 or greater than 1, while ascending a hill ?
Give reason for the following:
In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.
A pulley is a machine made up of a ______.
