Why is the tip of a sewing needle made sharp?
Since, pressure is equal to force per unit area, in order to produce a sufficiently large pressure on the cloth being stitched so that the needle can easily pass through the cloth, the tip of the sewing needle is made sharp.
What is pressure? What is the relation of pressure with area on which it is applied?
Air is thrown on a sail attached to a boat from an electric fan placed on the boat. Will the boat start moving?
Give two examples to show that air exerts pressure.
Is the pressure exerted on ground more when a person is walking than when he is standing? Why?
