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Question

Write down the units and dimensional formulae of following physical quantities:

Torque=force×length


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Solution

Units and dimensional formula of torque:

  • Torque: It can be defined as the turning effect of a force.
  • Mathematically, it can be given as Torque=force×length.
  • So, the SI unit of torque =N×m=Nm, i.e., Newton metre.
  • Use its unit to find the dimensional formula of elastic PE:
    Torque=force×length[Torque]=[MLT-2]×[L]=[ML2T-2]

Thus, the unit of torque is Newtonmetre,i.e.,N-m and its dimensional formula is [ML2T-2].


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