Review/Study Guide Chapter 19: Liquids

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Presentation transcript:

Review/Study Guide Chapter 19: Liquids

What does liquid pressure depend on? depth x density

Where is pressure the greatest on a submerged object? At the bottom. It’s deeper.

Where is there greater liquid pressure, 1 meter below a swimming pool or 1 meter below Lake Hopatcong? It’s the same. The depth is the same.

What is buoyancy? The apparent loss of weight of something immersed in a liquid.

What happens to the buoyant force on something as it sinks? It stays the same.

Why do some objects tend to rise when they’re placed in a liquid? Due to the upward buoyant force.

What is Archimedes’ principle of buoyancy? The buoyant force is equal to the WEIGHT of fluid displaced.

Why are lifejackets important? They increase volume. This results in a decrease in density.

An object denser than the liquid will: sink/float/neither.

An object less dense than the liquid will: sink/float/neither.

If an object has the same density as the liquid it’s in will: sink/float/neither. Neither sink nor float

Why does a solid iron block sink but not an iron ship? Because the hull of the iron ship displaces a greater volume of water.

What do you know about the buoyant force acting on a floating object? The buoyant force equals the weight of the object.

What is Pascal’s principle? The pressure exerted on an enclosed fluid that’s not moving is transmitted the same throughout the entire fluid.

What are two examples of Pascal’s principle? Hydraulic lift Forklift Brake systems Toothpaste tube

The force multiplied by a hydraulic lift is due to The greater surface area of the output cylinder.

Explain how the law of conservation of energy applies to a hydraulic lift? You cannot get more work/energy out of it then you put into it. F x d input = F x d output

What is the buoyant force on a 7-lb block that weighs 4-lbs under water? The buoyant force is 3-lbs.

How can you determine the volume of an irregularly shaped object? Submerge it in water and measure the amount of water it displaces.