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Science: Pressure
FMG: Perone's pressure, atmosphere, pascal, buoyancy, Archimedes' principle, etc
| Question | Answer |
|---|---|
| Define pressure. | It refers to a force pushing on a surface. It exists when two objects are in contact with each other. |
| What is the formula for pressure? | Force/Area This is measured in Pa (pascals), or if the area is in centimeters; N/cm^2 |
| Define pascal. | One newton per square meter. |
| True or False: more area = less pressure | True. More area will distribute pressure throughout the object, therefore exerting less pressure. |
| Define fluid. | substance that can easily flow, like liquids and gases. They exert pressure against the surfaces as they touch, when its molecules constantly collide with them. The forces exerted by each molecule in a fluid make up the pressure entered by the fluid. |
| What is fluid pressure? | the total force entered by a the fluid divided by the area over which the force is exerted. |
| What is the atmospheric pressure? | 14.7 pounds. |
| Why can't we feel the atmospheric pressure? | The fluids in us, like blood and water, exert pressure against it, balancing it. |
| What is the relationship between pressure and elevation? | Air pressure decreases as elevation increase. |
| Stuff about pressure and elevation | At higher elevations, there is less air, which results in less air weight, which finally means that there is less air pressure. Your body adjusts to lower pressure when your ears pop, for example, so the pressures can be balanced. |
| What is the relationship between pressure and depth? | Water pressure increases as depth increase. |
| Why does depth affect pressure? | The weight of the water is on you, and the air pushes down on the water, increasing the pressure. |
| What is the buoyant force? | the force that water exerts that acts on a submerged object It's equal to the displaced fluid. It increases if the places fluid does. |
| Which way does the buoyant force act? | Upwards, against the force of gravity, making the object feel lighter. |
| How can you use buoyancy to determine whether an object will sink or not? | Greater or equal buoyancy than gravity results in it floating. Greater gravity than buoyancy results in the object sinking. |
| What is Archimedes' principle? | the buoyant force on an object is equal to the weight of the fluid displaced by the object. If the weight of the object is greater than its buoyant force, the object will sink. |
| A steel ball has a weight of 10 pound. The buoyant force acting on it is 3 N. Will it float or sink? | It will sink. The ball's weight is greater than its buoyant force. |
| What is the formula for density? | density = mass/volume |
| How can densities affect an object's ability to float or sink? | If the object's density is greater than the fluid's density, it will sink. If the object's density is less than the fluid's density, it will float. |
| Why does a helium-filled balloon float? | Helium is less dense than air, |
| What is Bernoulli's principle? | pressure exerted by a moving stream of fluid is less than the pressure of the surrounding fluid. |
| Bernoulli's principle on airplane wings | Air that is moving on the top of the wing has less pressure than the bottom of the wing, according to the principle. Because of this, the top air moves faster, causing a difference in pressure. This creates an upward force on the wing, called lift. |
Created by:
adriananguyen
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