alleryStart learning →What is the SI unit of torque?
AThe joule, written as J
BThe newton meter, written N m
CThe newton per meter, N/m
DThe watt second, written W s
Answer & Solution
Correct answer: B. The newton meter, written N m
1. Torque is a distance multiplied by a force, so its unit is a length unit times a force unit.
2. Length is measured in meters and force in newtons, giving the newton meter, N m.
3. The joule has the same base dimensions but names an energy, which is a different physical quantity.
4. Newtons per meter is a spring stiffness and the watt second is again an energy, so neither fits.
_Source: OpenStax College Physics (CC BY 4.0), Ch 9 "Statics and Torque", section 9.2 The Second Condition for Equilibrium_
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