Question

we can wave our hand easily in air but to do the same with a wooden plank we need a karate expert.why?

Answer 1

We can wave our hand easily in air but to do the same with a wooden plank we need a karate expert because the air in the atmosphere will be free and do not have any bond with each other.

Answer 2

it is because the particles are loosely packed in gases and tightly in solids thus we need a karate expert to break it