Moment of a couple T=Fdtorque=force⋅perpendicular distance between couples\begin{align*} T &= Fd \\ \text{torque} &= \text{force} \cdot \text{perpendicular distance between couples} \end{align*}Ttorque​=Fd=force⋅perpendicular distance between couples​ Unit of TTT = N m\mathrm{N\,m}Nm
Moment of a couple
Unit of TTT = N m\mathrm{N\,m}Nm
Always produces rotational effect
Pair of equal and parallel forces