# CE2721 C4.pdf - Topics we gonna cover… Fluids and their...

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Topics we gonna cover… Fluids and their Properties - completed Pressure and Head - completed Static Forces on Surfaces - completed Buoyancy Motion of Fluid Particles and Streams Upaka Rathnayake (PhD) 79

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Buoyancy Force Upaka Rathnayake (PhD) 80 Archimedes (287 BC), born in Sicily. Created hydrostatics. His Principle When a body is placed in a fluid it experiences an upward force which is equal the weight of the fluid displaced. This force is called the Buoyancy Force.
Buoyancy Force contd. Upaka Rathnayake (PhD) 81 Totally submerged object Considering any vertical plane VV through the body. Projected area of each of the two sides on this plane will be equal The horizontal forces F will be equal and opposite. There is, therefore, no resultant horizontal force on the body due to the pressure of the surrounding fluid. The only force exerted by the fluid on an immersed body is vertical and is called the buoyancy or upthrust.

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Upaka Rathnayake (PhD) 82 It will be equal to the difference between the resultant forces on the upper and lower parts of the surface of the body.
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