Figure shows three pieces of card board of uniform thickness cut into three different shapes.On each diagram draw two lines to indicate the position of the centre of gravity $G$ .

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Solution

The centre of gravity (C.G.) of a body is the point at which the entire weight of the body is supposed to be concentrated.

Centre of gravity of a uniform square/rectangular shape:

The position of centre of gravity of a rectangular/square lamina is at the point of intersection of its diagonals.

Centre of gravity of a triangular lamina:

For triangular lamina, the centre of gravity lies at the point of intersection of its medians.

Centre of gravity of a uniform circular lamina:

The point can be predicted, by finding the intersection point of two diameters of the circular lamina.

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Figure shows three pieces of card board of uniform thickness cut into three different shapes.On each diagram draw two lines to indicate the position of the centre of gravity G.

Figure shows three pieces of card board of uniform thickness cut into three different shapes.On each diagram draw two lines to indicate the position of the centre of gravity $G$ .