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प्रश्न
Give reason for the following:
The efficiency of a pulley is always less than 100%
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उत्तर
The two reasons are:
(a) Some effort is wasted and overcoming the friction between the strings and the grooves of the pulley.
(b) Some effort is wasted in lifting up the movable block along with the load.
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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.
State two functions of a machine.
The mechanical advantage of an actual pulley is less than one. Give a reason. What is the justification for using the pulley then?
Explain how a gear system can be used to obtain gain in torque? Given one example.
Explain how a gear system can be used to obtain Change in direction of rotation. Given one example.
Define the following term in reference to a gear system for Gain in torque ?
In which direction does the force need to applied, when a single pulley is used with a mechanical advantage greater than one? How can you change the direction of force applied without altering its mechanical advantage? Draw a labelled diagram of the system.
What is the use of a fixed pulley?
Give a reason for the following:
In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.
