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lecture6-buoyancy-part2

# lecture6-buoyancy-part2 - So far Density = m/V pressure p =...

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So far … Density, ρ = m/V pressure, p = F/A, and Pascal’s principle gauge pressure & atmospheric pressure today Buoyancy EquaCon of conCnuity

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Newton vs. Archimedes Archimedes principle: The buoyant force on a body in a fluid is equal to the weight of the fluid displaced by that object. 1 2 Newton’s 2 nd law: F net = 0 when a body is NOT accelerating F B = mg F B = mg 1 2 ! f V f g = ! o V o g ! f ( 1 2 V O ) g = ! O V O g
Need to look at NET forces acting on an object will always be a MIN of 2 forces: (1) mass of object & gravity (2) force buoyancy Net forces in a fluid m If NOT MOVING àฏ these two will be EQUAL Maybe be MORE than 2 forces: àฏ F B = TOTAL weight, e.g., mg + tension, ρ o V o g + mg look at the SUM of the forces àฏ extra buoyancy force makes a mass appear lighter in a fluid

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worksheet: Buoyancy in Air What is the minimum volume of a helium-filled balloon to remain in the sky at one position?
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