A block and tackle system has a moving pulley supported by 2 strands attached to a second moving pulley supported by 2 more strands, for a total of 4 supporting strands. Ignoring friction, how much effort is needed to lift a 320 newton load?
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Correct!
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Correct answer to question 148 (Mechanical Comprehension): 80 newtons
Method
With 4 supporting strands, effort equals load divided by 4: 320 / 4 = 80 newtons.
Updated: November 2026
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