Maths, Physics Revision Physicss Maths Physics Physics A Level Physics Home Maths Maths Revision hut Centre of mass The centre of mass(or centre of  Gravity) of an object is where its Weight is said to act from.  You can do an experiment to find the centre of mass of a  Shape. Turning moments Distance Force A turning moment is defined as the force applied to a beam  or lever X the perpendicular distance from the direction of  the force to the pivot (fulcrum) The diagram shows a clockwise moment because it would turn  In a clockwise direction Distance M = F x d Force This is an anticlockwise moment F F d d For a beam to be balanced the clockwise Moment Fxd must equal the anticlockwise Moment Fxd Useful link Useful link