A wheel and axle has a wheel radius of 12 inches and an axle radius of 3 inches. What is its mechanical advantage?
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Correct!
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Correct answer to question 35 (Mechanical Comprehension): 4
Method
Divide the wheel radius by the axle radius: 12 / 3 = 4. A steering wheel and a screwdriver handle both work on this principle, trading a long travel at the rim for a strong turn at the centre.
Updated: November 2026
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