Among objects of the same size, which is considered the heaviest?

The iron plate is considered the heaviest among the objects listed because of its density and material properties. Density refers to the mass per unit volume of a substance. Iron, being a ferrous metal, has a significantly higher density compared to wood, plastic, and aluminum.

When we compare like-sized objects, the iron plate will have much more mass than the wooden block, plastic sheet, or aluminum foil. Each of the other materials – wood, plastic, and aluminum – has lower densities, meaning they weigh less for the same volume. Therefore, in a direct size comparison, the iron plate stands out as the heaviest option due to its compactness and heavy nature, highlighting the importance of material properties in determining weight.