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Presentation On Pressure

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Published in: Physics
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This PPT is suitable for the IGCSE and O Level Physics students. It only provides theoretical background of the topic. The practice questions, worksheets and topical questions will be discussed during the tutoring sessions

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  1. PRESSURE Physics (IGCSE / O-Level)
  2. What will you learn in this lesson? • Pressure and how pressure varies with force and area in the context of everyday examples • How pressure beneath the surface of a liquid changes with depth and density of the liquid • Recall and use the pressure equation for the change in pressure beneath the surface of a liquid (using density)
  3. Pressure • Pressure in the fluid (liquid or gas) caused by the weight of the fluid above it • Gravitational force of earth pull the atmospheric pressure down on us. So, what will happen to atmospheric pressure,when a person is on mountain? • In fluid (water or air), pressure does not only acts downwards — it acts equally in all direction because of the movement of molecules in all directions. That causes pressure on every object they collide with. weight of water Why dams have thick base?
  4. Pressure (contd.) The diagram shows two closed tanks, A and B. Each tank contains gas and is fitted with a manometer to show how the pressure compares with atmospheric pressure outside the tank. a) In which tank is the gas pressure greater than atmospheric pressure? Explain how you can tell. b) What can you say about the pressure of the gas in the other tank?
  5. Calculating Pressure Pascal (Pa) — the Sl unit of pressure, equivalent to one newton per square metre (1 N/m ). Stiletto or shoes, which one exerts more pressure on the floor?
  6. Calculating Pressure (contd.) An elephant has a mass of 5000 kg. The area of an elephant's foot is 0.13 Im3' A woman has a mass of 60 kg. The area of her stiletto heel is 25 mm2. a b c d State the equation linking weight, mass and g. Use the equation to calculate the weights of the elephant and the woman. State the equation that links (solid) pressure, force and area. calculate pressures exerted by the elephant and woman. (Hint: Remember that weight Is a force and that you need to convert the area of the stiletto heel Into rn2.) Use the presswe values you calculated to suggest why the women might cause more damage to a floor than an elephant.
  7. Calculating Pressure for Fluids change in pressure = density x acceleration due togravity X depth Ap = pgAh The diagram shows a tank that is filled with oil. The density of the oil is 920 kg/m . a) Calculate the volume of the tank from the dimensions shown in the diagram. b) Calculate the weight of the oil in the tank. c) The pressure on the bottom of the tank is caused by the weight of the oil. Calculate the pressure using: d) Now calculate the pressure using: Do you find the same answer? Ism

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