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### Density and Buoyancy for Grade 8 Science Class

• 1.
• 3. Archimedes Principle States that the upward buoyant force that is exerted on an object immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the object displaces Buoyant Force (N) = Weight of Liquid Displaced = (Mass Liquid x 9.8m/s^2)
• 4. Buoyancy • Definition: The upward supportive force on an object in a fluid • The force of gravity acting downward on a floating object must be equal to the buoyant force of the water acting upwards • If an object sinks, the force of gravity is greater than the buoyant force
• 5. Sinking vs Floating Floating object: Mass of Object (kg) = Mass of Liquid Displaced (kg) Weight of Object (N) = Weight of displaced liquid (N)/Buoyant force (N) Sinking object: Mass of Object (kg) > Mass of Liquid Displaced (kg) Weight of Object (N) > Weight of displaced liquid (N)/Buoyant force (N)
• 6.
• 7. Example: If 100 kg of water is displaced by a floating object, the buoyant force is equal to the weight of the water. If the weight of the water displaced is 980N, then the buoyant force is also 980N Weight Water = Mass x Gravity (F = m x g) = 100kg x 9.8m/s^2 = 980N
• 8. Shape & Buoyancy • The ball and the ship have the same weight – but the ball sinks & ship floats – why? • Because the shape of the ship displaces more water than the ball (the weight of the water displaced is greater), more upward buoyant force is applied allowing the ship to float
• 9. A boat has a weight of 1000N. When the boat is in water, it can displace up to 500kg of water. 1. Will this boat sink or float? 2. What is the buoyant Force? 3. What is the maximum amount of weight this boat can carry before sinking?
• 10. Buoyancy Applications: Oil & Water • Oil is less dense than water – so it floats on water • Difference in density helps during oil spills • Can scoop, suck or soak up much of the oil on top of the water
• 11. Buoyancy Applications: Fish • Swim Bladder: a controllable, balloon-like chamber that allows fish to alter their buoyancy • By changing amount of oxygen in bladder, fish alter their density and ultimately how much water they displace (changing their buoyancy) • More oxygen in bladder = less dense = higher float • Less oxygen = less dense = more sinking
• 12. Buoyancy Applications: Submarines • Ballast Tanks: Compartments in a ship or submarine that take in water to keep the ship stable or help a submarine dive below the surface
• 13. Boat Challenge Objective: Students will design and build a boat using aluminum foil that can carry the most weight while floating in water. Materials: Aluminum foil Best Design: Awarded to the boat with the most innovative, aesthetically pleasing, and well-executed design. Carry the Most Weight: Awarded to the boat that successfully carries the greatest amount of weight while remaining afloat.
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