Centre of Mass

  • Is the point around which all of its mass is evenly distributed
  • For motion, we assume that all mass is condensed at this point
  • It is the point about which a free body rotates


  • The higher the COM, and the smaller the support base, the more likely the object is to topple over
  • If the COM is low, it is in stable equilibrium. A force applied perpendicular to it will not tip it.
  • If the COM is high, it is in unstable equilibrium. A force will be able to tip it.
  • In neutral equilibrium, the object can roll but cannot tip over
  • When the line of action of the gravitational force falls outside the support base, the object will topple over

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