Use forces to make things turn. The turning effect that the force has is its moment.
The moment is bigger if the force used is bigger.
The moment is bigger if the distance between the force and the pivot (axis of rotation) is bigger.
Moment (Nm) = Force (N) x Distance from the line of action to axis of rotation (m)
If total anticlockwise moment = total clockwise monent the object will not turn.
If all the mass of an object is concentrated to a point it would be the centre of mass.
For any symmetrical object, the centre of mass is always on the axis of symmetry.
If there are more lines of symmetry the centre of mass is where the lines cross.
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