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Floating and sinking
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Present a real-world application of the principles of floating and sinking
ship design, submarine technology, hot air balloons, life jackets
Why do some objects float higher in saltwater than in freshwater?
Saltwater is denser than freshwater, providing more buoyant force.
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.
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.
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.
Explain why a piece of wood floats but a nail sinks.
Wood is less dense than water, while a nail is denser.
Why does a hot air balloon float?
Hot air is less dense than cold air.
How does a submarine change its buoyancy?
It adjusts the amount of water in its ballast tanks.
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 floats.
A wooden block, a balloon filled with air, an empty bottle (any less dense object)
Give an example of an object that sinks.
A rock, a coin, a nail (any dense object)
What happens to the water level when an object is placed in it?
The water level rises (displacement).
How are density and buoyancy related?
An object less dense than the fluid it's in will float.
What is density?
The amount of mass per unit volume of a substance.
What is buoyancy?
The ability of an object to float in a fluid.
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