PHYS 1200 Lecture Notes - Lecture 13: Suction Cup, Buoyancy
18 Aug 2016
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Pressure does not depend on shape but depth (demonstration of pascal"s vases) When using the suction cup on the chair, the atmospheric pressure is pushing down on the rubber, and there is no air between the rubber and wood of the stool. If the atmospheric pressure (pushing up) underneath the object is greater than the sum of the top atmospheric pressure (pushing down on the object), and the weight of the object, then an object will float. Even if an object does not float, it will still have a buoyant force (just not great/large enough to make it float) The buoyant force on an object in a fluid equals the weight of the fluid which it displaces. Water weighs 10 n/liter each liter of displaced water provides 10 n of buoyant force. The object will float if the buoyant force is enough to support the object"s weight.
