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Question
A nut is opened by a wrench of length 20 cm. If the least force required is 2N, find the moment of force needed to loosen the nut.
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Solution
According to the principle of moments, we have
Moment of load about the fulcrum = Moment of effort about the fulcrum
Load × Load arm = Effort × Effort arm
Given that the effort arm = 20 cm = 0.2 m, the minimum force E = 2 N
Therefore, the moment of load or the moment of force = 0.2 × 2 = 0.4 Nm
The moment of force needed to loosen the nut = 0.4 Nm
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