 Ch 7. Centroid/Distributed Loads/Inertia Multimedia Engineering Statics Centroid: Line Area Vol Centroid: Composite Distributed Loads Area Moment of Inertia
 Chapter 1. Basics 2. Vectors 3. Forces 4. Moments 5. Rigid Bodies 6. Structures 7. Centroids/Inertia 8. Internal Loads 9. Friction 10. Work & Energy Appendix Basic Math Units Sections Search eBooks Dynamics Statics Mechanics Fluids Thermodynamics Math Author(s): Kurt Gramoll ©Kurt Gramoll STATICS - THEORY Parallel Distributed Forces Load Distributed over a Line Load Distributed over a Area Previously, it was determined that the resultant force FR for a distributed load over a line is, It was also shown that the location of the line of action of FR is given by Similarly, if the load is distributed over an area as shown, then the resultant is found by The line of action of FR passes through the point defined by Forces on a Submerged Surface  Pressure on a Submerged Surface When a body is submerged in a fluid, either a liquid or a gas, then the fluid exerts a pressure normal or perpendicular to the surface. This pressure, called hydrostatic pressure, depends on the depth and density of the fluid, the acceleration of gravity, and the pressure at the surface of the liquid. The pressure at any point is      p = po + ρgd Here po is the pressure at the surface of the liquid, ρ is the density of the fluid, g is the acceleration of gravity, and d is the depth at that point. Generally, devices that measure pressure actually measure the amount above some reference pressure; this is called gage pressure. If the reference pressure is the pressure at the surface of the liquid, then the gage pressure at a point is simply      p = ρgd

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