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Floating and sinking

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  • How does a submarine change its buoyancy?
    It adjusts the amount of water in its ballast tanks.
  • Present a real-world application of the principles of floating and sinking
    ship design, submarine technology, hot air balloons, life jackets
  • How does the shape of an object affect its ability to float?
    A streamlined shape reduces water resistance and can help an object float better.
  • How are density and buoyancy related?
    An object less dense than the fluid it's in will float.
  • Explain why a piece of wood floats but a nail sinks.
    Wood is less dense than water, while a nail is denser.
  • How can you make a heavy object like a rock float?
    Attach it to a less dense material like a piece of cork or wood.
  • What is buoyancy?
    The ability of an object to float in a fluid.
  • Why does a hot air balloon float?
    Hot air is less dense than cold air.
  • What happens to the water level when an object is placed in it?
    The water level rises (displacement).
  • Why do some objects float higher in saltwater than in freshwater?
    Saltwater is denser than freshwater, providing more buoyant force.
  • Why does a ship made of iron float?
    It's hollow, which increases its volume and decreases its overall density.
  • Give an example of an object that sinks.
    A rock, a coin, a nail (any dense object)
  • What is density?
    The amount of mass per unit volume of a substance.
  • What is Archimedes' Principle?
    An object immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced by the object.
  • Give an example of an object that floats.
    A wooden block, a balloon filled with air, an empty bottle (any less dense object)
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