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Fluid Pressure Chapter 13 Section 1 Page 390 Slide 2 Objectives You should be able to explain what pressure depends on. You should be able to explain how fluids exert pressure. You should be able to describe how fluid pressure changes with elevation and depth. Slide 3 Fluid Pressure Chapter 13 Section 1 Pg. 390-393 Slide 4 Have you wondered? Slide 5 Pressure The result of a _____ distributed over an ____ So The ______ the area over which the force is distributed, the less pressure is _______. Ex: a pencil point has a much smaller area than the eraser, so it exerts much _______ pressure than the eraser. Slide 6 Surface Area of my bare feet = 400.0 cm2 Surface Area of my boots = 600.0 cm2 Surface Area of my snowshoes = 3600.0 cm2 Slide 7 Calculating Pressure Slide 8 Units _____- measured in newtons (N) Area- measured in ______ meters (m 2 ) _______- SI unit is newton per square meter (N/m 2 ) Also called ______ (Pa) 1 N/m 2 = 1 Pa Named for French scientist ______ Pascal Pressure is often in ___ 1 kPa = 1,000 Pa Slide 9 Practice Problem Calculate the pressure produced by a force of 800 N acting on an area of 2.0 m 2. P = F/A P = (800 N)/(2.0 m 2 ) P = 400 N/m 2 = 400 Pa = 0.4 kPa Slide 10 Slide 11 Fluids ______ also exert a pressure Fluid is a material that can easily flow Fluids take ____ of container Liquids and ______ are fluids Slide 12 Cause of Fluid Pressure Fluid particles ______ with a surface, exerting a force on the surface All of the forces exerted combine to make up the ________ exerted by the fluid The ______ of particles in a fluid is large, so a fluid can be considered as a whole. Slide 13 Fluid Pressure Determined by the ____ of fluid and its depth Slide 14 Fluid Pressure Water ________ increases as depth increases. The pressure at any given depth is constant, and it is ______ equally in all directions. Slide 15 Why do ears pop? Slide 16 Air Pressure Earths _________ is made up of a mixture gases Atmospheric pressure = 101 kPa at ________ ___ pressure decreases as the altitude increases Slide 17 Slide 18 How does a straw work? Slide 19 Review Slide 20 1. Order from lowest to highest pressure. A.A