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Buoyancy

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Buoyancy

1. 1. Comparing Cubes Sofia has two solid cubes made of the same material. One cube is very large, and the other cube is very small. Which statement below is true? A. The density of the larger cube is greater than the density of the smaller cube. B. The density of the larger cube is less than the density of the smaller cube. C. The density of the larger cube is the same as the density of the smaller cube.
2. 2. ReviewReview Density A measure of how much matter (mass) is contained in a volume of a material How much “stuff” is in the “space” of an object D = m/V
3. 3. BuoyancyBuoyancy An upward force on an object in water equal to the weight of the water the object pushes out of the way
4. 4. BuoyancyBuoyancy Example: Clay ball It sinks in water Force of Gravity Buoyan t Force
5. 5. BuoyancyBuoyancy If the buoyant force is less than the objects weight The object sinks Negative buoyancy
6. 6. BuoyancyBuoyancy Flatten the clay out Shape it like a boat It floats Force of Gravity Buoyan t Force
7. 7. BuoyancyBuoyancy If the buoyant force is equal to the objects weight The object floats Positive buoyancy
8. 8. BuoyancyBuoyancy Neutral buoyancy? An object seems to be suspended in a liquid
9. 9. BuoyancyBuoyancy If the objects density is less than 1 g/cm3 , it floats in water If an objects density is greater than 1 g/cm3 , it sinks in water Another way to look at it…
10. 10. BuoyancyBuoyancy All this applies to other liquids And gasses too!!
11. 11. Force of Gravity Buoyan t Force of Air
12. 12. Bob’s homemade buoyancy control device still needed some minor tweaks.