Physics – 1.5.3 Centre of gravity | e-Consult

Why the method is not ideal:

This method is not ideal because the lines drawn at 45° to the vertical will not necessarily intersect at the true centre of gravity. The vertical line of gravity passes through the centre of gravity, but the 45° lines are influenced by the shape of the metal and may not accurately reflect the vertical line of gravity at the centre of gravity. The lines are likely to intersect at a point that is off-centre.

Suggested Improvement:

The student should suspend the metal from a plumb line and repeat the process at more than two points. Ideally, at least three or four different points should be chosen, ensuring they are well-spaced across the metal's surface. The intersection of the vertical lines drawn at these points will give a more accurate determination of the centre of gravity. Using a larger lamina would also improve accuracy.