Question

The illustrations show blocks of different materials attached to balances. Observe the positions and sizes of the blocks. In each case, determine if it is possible or not possible to say which block has greater density.

Answer 1

When we balance something, the material with heavy mass shifts the weight to one side.
Now, we know
$$\begin{gathered} \mathrm{Mass}=\mathrm{Volume}\times \mathrm{Density} \\ \mathrm{Density}=\frac{\mathrm{Mass}}{\mathrm{Volume}} \end{gathered}$$
So, from the following figures, we can observe that A has a greater density than B.
C has a greater density than D as the volume is the same in both materials.
But we can't predict in the third case because in third case mass and volume both factors are increasing, so we can't judge which material has greater density.