Q47 of 176 Page 124

Why does a ship made of iron and steel float in water whereas a small piece of iron sinks in it.

A ship made of iron and steel is a hollow object which contains a lot of air in it. Due to the presence of a lot of air in it, the average density of the ship becomes less than the density of water. Hence a ship floats in water. On the other hand, a piece of iron is denser than water, so it sinks in water.


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Name these forces:

(a) The upward push of water on a submerged object.


(b) The force which wears away two surfaces as they move over one another


(c) The force which pulled the apple off Isaac Newton’s tree.


(d) The force which stops you falling through the floor.