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

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Solution

We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert because the molecules of air have less force of attraction between them and a very small external force can separate them and pass through it.
But in case of solids, the molecules have the maximum force of attraction, the particles are tightly bound due to this force.
Hence a large amount of external force is required to pass through a solid.

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Give reason for the following:
We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.

Give reasons:

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

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