What will happen if you press your hand against a wall?
Wall changes shape
Nothing happens to the wall
Wall starts to move
None of these
Nothing happens to the wall because your hands cannot apply enough force to either move or break the wall.
What will happen if you press your hand against a concrete wall?
When you push the wall with your hand what happens ?
What happens when you rub your hands vigorously for a few seconds ? Why does this happen ?