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# Science

### Ch 11 - Forces in Fluids

What happens to air pressure at higher altitudes? Air pressure decreases.
How many pistons do hydraulic systems use? There are two pistons which have different surface areas.
What happens to water pressure as the depth increases? Water pressure increases.
How does the pressure outside of your body compare to the pressure inside your body? The pressure inside balances the air pressure outside.
Which directions does a buoyant force work? It generally acts upwards.
How does density of a submarine decrease? It releases water from flotation tanks.
How does the pressure of a moving stream compare to the pressure of surrounding fluid? The pressure is less than the surrounding fluid.
What is the formula for density? Mass divided by volume of a substance.
Pressure can be measured using what metric? Newtons per square cenitmeter.
If the density of an object is higher than the density of a fluid, what happens? The object sinks.
If the density of an object is lower than the density of a fluid, what happens? The object floats.
What is a fluid? A substance that can easily flow and change shape.
What is an independent variable? The variable that is being changed on purpose.
What is a dependent variable? The variable that measures a change.
What is a control variable? The variable that remains the same.
What is the formula for fluid pressure? The total force of a fluid divided by the area.
What multiplies a force by transmitting a change in pressure from a smaller surface area to a larger surface area? A hydraulic system.
What happens when you increase the temperature of a sealed container? The pressure of the gas will increase.
What is Pascal's principle? The pressure contained in a fluid is spread equally.
What is Archimedes' principle? The buoyant force acting on an object equals the weight of the fluid displaced.
What is Bernoulli's principle? The pressure in a moving stream of fluid is less than the fluid that surrounds it.
Why do you float higher in salt water than in fresh water? The potential buoyant force is greater in salt water.
When you place an object in water, why does the water level rise? The object has volume.
What is the upward force on a flying object called? Lift.
What does increasing the number of molecules in a sealed container of gas do? It causes the pressure of the gas to increase.
What does increasing the volume of a sealed container of gas do? It causes the pressure of the gas to decrease.
What are buoyant forces caused by? Differences in pressure.
As a diver rises to the surface of the water, what happens? The pressure of the person's body gets lower.
As wind flows over a building, it typically accelerates producing a low pressure uplifting force. Which principle does this relate to? Bernoulli's principle.
Created by: mredman
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