Question

• Ayesha put a puffed puri in a bowl of water. Would it sink or float?
• You put a steel plate on water. Would it sink or float? What would happen to a spoon?
• Would the cap of a plastic bottle sink or float on water?

Answer 1

• Puffed puri in a bowl of water would float as it is lighter than water. However, after sometime it would start to sink due to absorption of water by the dough of puri.

• A steel plate would float on water as it is lighter than water. On the other hand, a spoon which is heavier than water would sink. The size of a body does not decide whether it floats or sinks. It is the mass and volume of the body that collectively decide whether it floats or sinks.

• The cap of a plastic bottle would float on water as it is lighter than water.