3. ATMOSPHERIC PRESSURE 3 ATMOSPHERIC PRESSURE Important points to remember : 1. Force : Force is required to (1) move a stationary object (2) stop a moving object (3) change the velocity and speed of an object (4) change the size and shape of an object. 2. Pressure : The force applied on unit area is called pressure. Pressure_ force area The unit of pressure is the newton per square metre (N/m_). 3. Pressure affects substances in the solid state, liquid state, as well as the gaseous state. 4. A fluid substance exerts equal pressure in all directions. 5. A fluid flows from a region of higher pressure to a region of lower pressure. 6. The pressure exerted by the atmosphere is called atmospheric pressure. 7. The working of a pump, a spray pump, etc., is based on the atmospheric pressure. Questions and Answers Q. 1 Answer the following questions : (1) State the effects of a force acting on an object. Ans. The force acting on an object ...
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