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प्रश्न
Give two reasons why the efficiency of a single movable pulley system is not 100%.
उत्तर
The efficiency of a single movable pulley system is not 100% this is because
- The friction of the pulley bearing is not zero.
- The weight of the pulley and string is not zero.
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संबंधित प्रश्न
What is a pulley?
State if the following statement is true or false. Correct the statement if it is false.
A single movable pulley is a pulley that has its axis of rotation fixed.
Answer the following in short.
Explain the various functions that a machine can perform.
Name a machine to change the direction of force ?
Define the following term in reference to a gear system for Gain in speed ?
What is a single movable pulley? What is its mechanical advantage in the ideal case?
Write two uses of pulleys. Is pulley a force multiplier?
Diagram given below shows an arrangement of four pulleys. A load L is attached to the movable lower block and effort E is applied at the free end of the string.
Copy the diagram; and
(i) Draw arrows to indicate tension in each part of the string; and
(ii) Calculate the mechanical advantage of the system.
A man raises a load of 360 kgf using a block and tackle system of 3 pulleys. If the efficiency of the pulley system is 60%, what effort is applied by the man?
State one advantage of single movable pulley.
