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Buoyancy p
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When an object is placed in water, it displaces, or moves, water out of the way. Think of the last time you took a bath!
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Do you displace water when you swim in the ocean
Do you displace water when you swim in the ocean? Does the water level rise when you enter?
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1. What is a force? A push or a pull
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2. Why do objects feel lighter in water?
Because of buoyancy!
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3. What is buoyancy? A force that acts in the upward direction, against the force of gravity, so it makes an object feel lighter when placed in a fluid. Weight Buoyant force
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4. What direction does the buoyant force act?
Upward! (opposite of gravity)
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5. How can you tell how strong the buoyant force is?
By using Archimedes's principle
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6. What is Archimedes Principle?
The buoyant force on an object is equal to the weight of the fluid displaced by the object. Eureka!
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7. Why do steel ships float?
By changing the shape, you can change the volume! Weight of ship = Weight of displaced water
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Buoyant force equals weight of displaced water!
= Buoyant force
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Titanic…unsinkable!
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Buoyancy Quiz
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1. If you dive into a pool, ocean, or lake there is a force that pushes your body upward. Everything that floats has this upward force pushing and pushing it. What is the name of this upward pushing force?
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2. Draw a sketch that illustrates this upward
force in the example in question one.
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3. If Olympic swimmer Amanda Beard displaces 130 lbs of water when she is swimming, how many pounds (lbs) of buoyant force would be pushing her up?
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4. If Amanda weighs 120lbs will the buoyant force be enough to make her float or will she need to swim to keep afloat?
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