Question

explain why,we can easily move our hand in air but to do the same through a plank of wood,we need a karate expert​

Answer 1

Explanation:

because the particles in air are loosely bounder to each are and there is less force of attraction between theWe can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. It is because the molecules of air has 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 maximum force of attraction, the particles are tightly bound due to this force. Hence large amount of external force is required to pass through solid.

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Answer 2

Air is a gas, it has more space in between particles. But solid block of wood is rigid, hence it is difficult to move our hands through it.