Forces can have a turning effect or moment on a body

**Moment of a force = force x perpendicular distance to the pivot**

When an object is balanced:

**sum of anti-clockwise acting moments = sum of clockwise acting moments**

Centre of gravity - the point where a object will balance on a pivot. The whole weight of the object appears to act at this point.

For a regular shape, the centre of gravity is where the lines of symmetry cross.

For an irregular shape, the centre of gravity is found by hanging the shape by a pivot and hanging a plumb line at the same place. A line can be drawn along where the plumb line hangs. Repeat this again in a different place and the centre of gravity is were the two lines cross.

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