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### Buoyancy.ppt

• 2. Pressure in a Fluid • Objects in a fluid experience an buoyant force which can make them float. • Liquids and gases are fluids—materials that can flow and have no definite shape. 3.2 Pressure and the Buoyant Forces
• 3. Pressure and Depth • The water more water above you, the more pressure you feel. 3.2 Pressure and the Buoyant Forces
• 4. Pressure in All Directions • Horizontal pressures cancel each other out. 3.2 Pressure and the Buoyant Forces
• 5. Buoyant Force and Depth • The bottom of the fish is deeper, so there is more force pushing up on it – a buoyant force. 3.2 Pressure and the Buoyant Forces
• 6. What causes buoyant force? • Buoyant force is the force on an object exerted by the surrounding fluid. • When an object pushes water, the water pushes back with as much force as it can. • If the water can push back as hard, the object floats (boat). If not, it sinks (steel). 3.2 Pressure and the Buoyant Forces
• 7. Archimedes’ Principle • states that the buoyant force is equal to the weight of the fluid the object displaces. • 1 cm3 of steel weighs more than the 1 cm3 of water it displaces, so it sinks. 1 cm3 of ice weighs less and so it is pushed up. Newton’s 3rd Law – an object can push back with no more force than it can push.
• 8. How to measure the buoyant force • Weight of object in air - weight of object in water = upward buoyant force. • The buoyant force is equal to the weight of the displaced waterObject’s weight in air - object’s weight in water = Buoyant Force = Weight of displaced water
• 9. Pressure is the ____ per unit area. A mass B volume C force D pascal 3.2 Pressure and the Buoyant Forces A B C D 0% 0%0%0% 1. A 2. B 3. C 4. D
• 10. Which direction does the buoyancy force act on an object? A upward B downward C to the left of the object D to the right of the object 3.2 Pressure and the Buoyant Forces A B C D 0% 0%0%0% 1. A 2. B 3. C 4. D
• 11. Where is the pressure the greatest on an object in a fluid? A top B bottom C sides D none of the above 3.2 Pressure and the Buoyant Forces A B C D 0% 0%0%0% 1. A 2. B 3. C 4. D
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