![]() ![]() The centroid gives a definition of the mean position of an area (volume). ![]() COP: A point where the entire forces (Resultant force) were concentrated at a single point. Gordan Dam, Tasmania is an arch dam The Koshi Barrage damġ0 WHAT IS A RESULTANT FORCE AND CENTRE OF PRESSURE ?Įngineering Mechanics Resultant force: A force that results from the combination of two or more forces. The Hoover Dam is an example of an arch-gravity dam.Ĩ EXAMPLE : Dam (cont.) The Grand Coulee Dam is an example of a solid gravity dam. **Atmospheric pressure Patm can be neglected when it acts on both sides of the surface.ħ EXAMPLE : Dam The Gathright Dam in Virginia is a rock-fill embankment dam. Problem To find the resultant force FR (magnitude) and its point of application (center of pressure) for non-uniformly distributed pressure. Only when the pressure distribution is uniform over the entire area of interest.ĥ HYDROSTATIC FORCES What about the areas where the pressure is non-uniformly distributed ? FIND THE AVERAGE PRESSURE AND WHERE IT ACTS Applications: Floating or submerged bodies, water dams and gates, liquid storage tanks, etc. Liquid – hydrostatics Gas – aerostatics.ģ FLUID STATICS The only stress in fluid statics is normal stress (perpendicular to surface) Normal stress is due to pressure (Pressure: gravity field-weight of fluid) Variation of pressure is due only to the weight of the fluid → fluid statics is only relevant in presence of gravity fields. Thus, no shear stress (tangential stress) to deform the fluid. No relative motion between adjacent layers. Presentation on theme: "Chapter 3 (Cont.) FLUID STATICS HYDROSTATIC FORCES AND BUOYANCY"- Presentation transcript:ġ Chapter 3 (Cont.) FLUID STATICS HYDROSTATIC FORCES AND BUOYANCYĢ FLUID STATICS Deals with problems associated with fluid at rest.
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