Properties of Fluids

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# Properties of Fluids - PowerPoint PPT Presentation

Properties of Fluids. What happens if you drop a penny into a cup of water? Why?. The nail sinks because the density of the steel is greater than the density of the water. But.. What happens when...?.

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## PowerPoint Slideshow about 'Properties of Fluids' - ross

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Presentation Transcript
Properties of Fluids
• What happens if you drop a penny into a cup of water?
• Why?

The nail sinks because the density of the steel is greater than the density of the water.

But.. What happens when...?
• But ocean liners are made of steel so why do they float, and since they do float, why do they sometimes also sink?
Gravity Vs. Buoyancy
• Everyone’s heard of gravity - force that pulls everything downward
• There is also an opposing force – Buoyancy
• Buoyancy is the push to gravity’s pull.
• Buoyancy is the force that floats the boat.
Buoyancy
• To understand buoyant force, let's think about what happens when you put an ice cube into your glass of water.
• As the ice cube displaces, or pushes away, some of the water it causes the level in the glass to rise and your ice cube to float partially in and partially out of the water like a miniature iceberg.
Why?
• Gravity is pulling the ice cube down and buoyant force is pushing it up. How far in or out of the water your ice cube rests depends on its density, or solidness, because that is what the pushing and pulling forces are working against.

Archimides Principle

• A Greek mathematician and inventor named Archimedes noticed that when he stepped into his bathtub the water level rose. He reasoned that the weight of the water he displaced was equal to the buoyant force in the water.
• This is called Archimedes Principle and it applies to all fluids.