Question

There are three solids made up of aluminium, steel and wood, of the same shape and same volume. Which of them would have highest inertia?

Answer 1

As the mass is a measure of inertia, the ball of same shape and size, having more mass than other balls will have the highest inertia. Here, as the volume is same so, the mass $\propto$ density. Steel has more density than aluminium or wood, so steel has more mass than aluminium or wood. Therefore, steel has highest inertia.