Physics - Centre of Mass

centre of mass explained...

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Centre Of Mass

Centre of mass (CM) = point where the whole weight  (W) of the object acts (aka the point at which the object balances.

CM of a symmentrical object is found along the axis of symmetry. When an object has several axis of symmetry, it's where the lines meet.


  • centre of mass is directly below point of suspension and when a plumbline is placed in the same position as the suspended object, the centre of mass is somewhere on the line created by the plumbline.
  • by moving the object round and keeping the plumbline stationary, multiple lines will be drawn.
  • the centre of mass is where all of the lines meet
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