Physics
Meera chose to use a block and tackle system of ‘9’ pulleys instead of a single movable pulley to lift a heavy load.
(a) What is the advantage of using a block and tackle system over a single movable pulley?
(b) Why should she connect more number of pulleys in the upper fixed block?
Machines
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Answer
(a) A block and tackle system with multiple pulleys provides a higher mechanical advantage, which means less effort is required to lift a heavy load compared to a single movable pulley since in a single movable pulley, mechanical advantage (M.A.) is 2 but in a block and tackle system with 9 pulleys, the M.A. can go up to 9 (ideally), making it much easier to lift heavier loads with the same effort.
(b) To ensure smooth and balanced operation, more pulleys should be in the upper fixed block because :
- It reduces the weight of the movable block, making it easier to lift.
- It helps in maintaining stability and reduces oscillation during lifting.
- It also makes arrangement and threading of ropes more efficient and manageable.
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