Short answerEasy1 mark
2(iv)
Meera chose to use a block and tackle system of ‘9’ pulleys instead of a single movable pulley to lift a heavy load.
What is the advantage of using a block and tackle system over a single movable pulley?
Topic: Mechanical advantage of block and tackle
Question wording verified against source paper
Answer
Exam answer
It provides a much greater mechanical advantage, so a smaller effort can lift the same load.
Explanation
An ideal 9-pulley block and tackle has a larger velocity ratio than a single movable pulley.
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The Velocity Ratio (VR) of a block and tackle system of two pulleys with the effort in the upward direction is:
(a) 1
(b) 2
(c) 3
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