A balanced first-class lever has a 60 kilogram load sitting 1.5 metres from the fulcrum. What force must be applied 3 metres from the fulcrum on the other side to balance it?
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Correct answer to question 134 (Mechanical Comprehension): 30 kilograms
Method
Balance requires load times its arm equal to effort times its arm: 60 x 1.5 = 90, so effort = 90 / 3 = 30 kilograms.
Updated: November 2026
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