Question

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

Answer 1

because there is so much space between molecules of air so we can easily move our hand

but in wood molecules are tightly packed so we need a great force to break it

Answer 2

we can easily move our hand in the air but to do same through a plank of wood we need a karate expert because the intermolecular force of attraction of air is very less than of wood