Explain the following :
a. Why can't we hammer a nail by its head on the wood?
b. A sharp knife cuts better than a blunt knife. Why? [3 MARKS]
we know that pressure = ForceArea
a. The head of the nail has a larger area than the tip so the pressure is reduced if we try to push the head into the wood.
b. A sharp knife has a lesser surface area than blunt one, so, a sharp knife applies a greater pressure when used for cutting.