Question

explain why we canmove our handeaisily in airbut to do the same through a plank of wood we need a karate expert

Answer 1

Hey mate!!!!!

Air is a mixture of gases and we know that gases have molecules of loosely packed. Since they are loose, they show very less force of attraction and thus we can lift hand easily.
Solids have tight molecules and they show very high force of attraction. Thus it is hard to move through them

Hope it helps dear friend ☺️✌️

Answer 2

In air, there is lot of empty space between the molecules and the forces between the particles are almost negligible. Hence, we can move our hand in air. However we cannot move our hand in a solid block because there are strong forces of attractions between particles in a solid and there is no empty space between them.