Air is thrown on a sail attached to a boat from an electric fan placed on the boat. Will the boat start moving?
An external force sets the object in motion. Here, the fan is placed inside the boat. Therefore, there is no motion due to the fan blowing wind into the sail.
Here, when the air from fan pushes the sail, air also pushes the fan in opposite direction.
Why is the tip of a sewing needle made sharp?
What is pressure? What is the relation of pressure with area on which it is applied?
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?
