Question

NCERT CLASS IX - Science Textbook
Chapter 1 - Matter in Our Surroundings

Give reasons:

(d) We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert.

Answer 1

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HERE IS YOUR ANSWER
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We can easily move our hand in air, but to do the same through a solid block of wood, we need a karate expert.This is because the particles of solid are tightly packed and they have more force of attraction between their particles than that of the air which is a gas.

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Answer 2

Particles of air have large spaces between them.On the other hand,wood
has little space between its particles.
Also,it is rigid.For this reason,we can
easily move our hands in air,but to do
the same through a solid block of wood,
we need a karate expert.