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If the total sum of moments about one of its axes is not zero, an aeroplane would:
  • A
    fly a path with a constant curvature.
  • B
    experience an angular acceleration about that axis.
  • C
    be difficult to control.
  • D
    not be affected because the situation is normal.

A moment is a turning force, it doesn't propel the aircraft in a direction, but will try to turn the aircraft. 

All moments occur about the CG and if they are not 0, angular acceleration (motion) will happen unless it is neutralised by another equal and opposite moment.

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