Important Questions on Pressure How much force is acting upon the bench 'A' and the bench 'B' in the activity given above? How is force different from pressure? Why are needles made pointed? What makes the thumbtack pierce the card sheet easily than a paper pin? If you push on a piece of soft wood with your thumb, the thumb will not go into the wood whereas the same force pushes the thumbtack into the wood. How? Why does a sharp knife cut better than a blunt knife? Why is the depression more when you stand on a soft spongy cushion than while sleeping on it? Why are 'sleepers' provided under the parallel running rails on rail track? 
