Question

Shreya while playing with her elder brother in the garden pool, observed that a wooden block sinks in water but a wooden plank of same weight floats on water. She was very astonished on seeing this. Shreya’s brother on seeing such question mark on her face explained the reason.(a) What is density?(b) Why some substances float while other sink in water?(c) Why the wooden plank float on water while the wooden block sink in water though both have same weight?(d) What value of Shreya is shown here?

Answer 1

Answer:

(a) Density is defined as mass per unit volume of a substance.

(b) Substances that have density lower than water floats while substances that have density less than water sinks in water.

(c) Volume of wooden block is more than the wooden plank as weight of wooden plank is distributed to larger area than the wooden block. So wooden plank floats while wooden block sinks.

(d) Shreya is curious, good observation capacity and intelligent.

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