Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Explain why we can easily move our hands in the air, but to do the same through a block of wood, we need a karate expert.

Answer 1

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The particles of air due to weak forces of attraction have large spaces between them. On the other hand, wood has very strong forces of attraction among its particles, hence very little space between them. For this reason, we can easily move our hands in the air, but to do the same through a block of wood, we need a karate expert.