Question

Why do you need less effort to drive in a screw through a piece of wood rather than to hammer in a nail?

Answer 1

1. Hammering required impact to put the nail into the wooden piece.
2. When we hammer a nail, we fix it by compressing wood fibers down.
3. Hence, large effort is required during hammering.
4. But a screw makes fibers to move aside.
5. So, the screw required less force.
6. Hence, we need less effort to drive a screw through a piece of wood rather than to hammer in a nail.