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प्रश्न
Give reason for the following:
In case of a block and tackle arrangement, the mechanical advantage increases with the increase in the number of pulleys.
उत्तर
This is because mechanical advantage is equal to the total number of pulleys in both the blocks.
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संबंधित प्रश्न
State whether the following statement is True or False.
A pulley changes the direction of force.
Answer the following in detail.
How does a pulley make work simpler?
Explain the working of a gear system.
Define the following term in reference to a gear system for Gain in speed ?
Give reason for the following:
The lower block of a block and tackle pulley system must be of negligible weight
In the case of a block and tackle arrangement, the mechanical advantage increases with the number of pulleys. Explain.
A type of single pulley is very often used as a machine even though it does not give any gain in mechanical advantage. Name the type of pulley used.
What is the relation between the mechanical advantage and the number of strands of string used to support the load, in a ‘block and tackle’ set-up?
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.
In a single movable pulley system, a load of 125 kgf is lifted by an effort of 75 kgf. Find the percentage efficiency of system.
