Question

A nut is opened by a wrench of length $10cm$. If the least force required is $5.0N$, find the moment of force needed to turn the nut.

• A. $50N$ $m$
• B. $0.5N$ $cm$
• C. $5N$ $m$
• D. $0.5N$ $m$

Answer 1

The correct option is D $0.5N$ $m$

Given that we are applying a force of 5 N and a nut is opened by a wrench of length 10cm ( is also equal to 0.1 m). Moment of force is given by formula $r\times F$. Hence $0.1\times 5=0.5N-m$. Hence moment of force is $0.5Nm$.