Answer to Question #142001 in Quantum Mechanics for Jay

Question

Describe an experiment to determine the position of the centre of gravity of a flat piece of cardboard cut into the of a triangle. Use the conditions of equilibrium you have stated to justify your practical method.

Answer 1

First, I would fix a thin needle on a stand. Then, I would penetrate the triangle with a thin needle so that the triangle lies in a vertical plane. If the triangle keeps its position no matter how I rotate it, I hit the center of gravity and all what is left is to mark it and measure the distance to the closest side.

If it rotates due to gravity, I need to change the point where the needle penetrates the triangle until I find the center of gravity.