Devil physics The baddest class on campus Pre-DP Physics

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Devil physics The baddest class on campus Pre-DP Physics

Giancoli Lesson 10-6 Buoyancy and archimedes’ Principle

Video: Archimedes Principle

Buoyancy Stuff floats Stuff in water seems lighter than stuff on land This is because the fluid is exerting a pressure on the object that opposes the gravity force (weight) Fluid pressure increases with depth When the fluid pressure equals the weight, the object will stop sinking

Buoyant Force The force of fluid pressure that opposes weight

Buoyant Force The force of fluid pressure that opposes weight

Buoyant Force The force of fluid pressure that opposes weight

Buoyant Force The force of fluid pressure that opposes weight

Archimedes’ Principle The force of fluid pressure that opposes weight The volume of the cylinder displaces the same volume of water that was there before the cylinder was immersed

Archimedes’ Principle The force of fluid pressure that opposes weight The buoyant force on a body immersed in a fluid is equal to the weight of the fluid displaced by that object

Sample Problem An 180kg treasure chest sits 30m below the surface of the ocean. The dimensions of the chest are 0.6m x 0.4m x 0.4m. How much work will it take to bring it to the surface and then lift it 1.5m to the deck of the boat?

Sample Problem An 180kg treasure chest sits 30m below the surface of the ocean. The dimensions of the chest are 0.6m x 0.4m x 0.4m. How much work will it take to bring it to the surface and then lift it 1.5m to the deck of the boat? Fpull FB Fg

Sample Problem An 180kg treasure chest sits 30m below the surface of the ocean. The dimensions of the chest are 0.6m x 0.4m x 0.4m. How much work will it take to bring it to the surface and then lift it 1.5m to the deck of the boat? Fpull FB Fg

Sample Problem An 180kg treasure chest sits 30m below the surface of the ocean. The dimensions of the chest are 0.6m x 0.4m x 0.4m. How much work will it take to bring it to the surface and then lift it 1.5m to the deck of the boat? Fpull Fg

Archimedes and the King’s Crown The King asked Archimedes to determine whether his crown was pure gold or a fake Archimedes knew the specific gravity of gold and could determine the mass of the crown, but could not figure out how to determine the volume of the irregularly shaped crown One day when he got into the bathtub, the water spilled out over the sides

Archimedes and the King’s Crown He realized that the increase in volume of the tub water was equal to his volume because his body was displacing the water If he could weigh the water that was displaced, he could use the density of water to determine the volume of the displaced water and thus determine the volume of his body The same could be done with the king’s crown

Archimedes and the King’s Crown Let’s try it

Floating Objects An object floats on a fluid if its density is less than that of water An object sinks if its density is greater than that of water What is your specific gravity?

Floating Objects A log has a density of 0.6 x 103 kg/m3 and has a mass of 1200kg. Prove that it will float. If it is held under water and then released, what will be its acceleration toward the surface?

Questions?

Homework #21-30