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Phys Sci - Chap 13
study guide
| Question | Answer |
|---|---|
| What are the units for pressure, force and area? | Pressure=Pascal (Pa), force=Newton (N), and area=meters squared (m2) |
| How do you find pressure? | P=f/a (pressure=force divided by area) |
| What is Pascal's Principle? | A change in pressure at any point in a fluid is transmitted equally throughout the fluid. |
| How does a hydraulic system work? | in a hydraulic lift system, an increased output force is produced by a constant fluid pressure exerted (input force) on the larger area of output piston |
| What is Bernoulli's Principle? What are examples of this principle> | As speed increases, pressure decreases; as speed decreases, pressure increases. hairdryer and ping pong ball. Two vehicles passing each other. |
| How does an airplane fly using Bernoulli's Principle? | The air over the top of the wing moves faster than the air underneath. So underneath the wing there is less pressure - this creates lift. |
| How does the plane land? | The wings get turned and as the plane slows the speed on the bottom of the wing moves faster than on top. Now lower pressure in on top, This creates drag and helps bring the plane down. |
| Archemedes Principle | The buoyant force is equal to the weight of fluid displaced. |
| What property affects buoyancy? | Density |
| Describe buoyancy and when objects float, sink or are suspended in a fluid. | Buoyancy has to do with weight and buoyant force; If object is less dense than water, object will float, if object's density is equal to water's density then object will be suspended, and if object density is great than water's density, it will sink. |
| If object is floating - buoyant force is __________than weight | greater |
| If object is suspended - buoyant force is _____________ to weight | equal |
| If object has sunk - buoyant force is ___________than weight | less |
| What direction does buoyant force act? | Upwards |
| Why is it easier to float in salt water versus fresh water. | Because salt water is more dense than fresh water. |
| Buoyant force is | equal to the displacement of water. |
| Principles and what you can associate with them. | Pascal - toothpaste tube; Bernoulli - airplane; Archemedes - boats/submarines |
| The amount of pressure on an object in a fluid depends on what. | How deep you are |
| How is force different from pressure? | Force is a push or pull. Pressure is a force distributed over an area. |
| Air pressure _______________ as altitude increases | decreases |
Created by:
msparks
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