How to find the centre of mass of a suspended object:
1. Suspend a thin sheet from a pin (horizontal metal rod) held in a clamp/retort stand. Because it is freely suspended, it can turn.
2. When it comes to rest, hang a plumbline from the same pin.
3. Mark the position of the plumbline against the sheet.
4. Hang the sheet with the pin at another point and repeat the procedure.
5. The centre of mass is where the lines that marked the position of the plumbline cross.
For a diagram, go to page 75 of the AQA GCSE Physics revision guide.
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