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Test 4 !<33
Forces in Fluids
| Question | Answer |
|---|---|
| The design of a wing | causes the air above the wing to travel faster than the air below the wing ; helps create lift ; creates a low-pressure zone above the wing |
| An object displaces a volume of fluid that | is equal to its own volume |
| Fluid pressure is always directed | in all directions |
| Materials that can flow to fit their containers include | both gases and liquids |
| Gasses exert pressure | evenly in all directions |
| Fluids flow | from regions of high pressure to low pressure |
| Hydraulic devices use liquids instead of gasses because | Liquids can be compressed and gasses cannot |
| An objects sinks when it displaces a volume of liquid that has weight | less than the object's weight |
| Most substances | are more dense than air |
| Helium floats in air because | it is much less dense than air |
| Steel is almost eight times more dense than water. A steel ship can float in water instead of sink because of its | shape |
| Jet engines can create a great deal of ____, so the wings do not have to be very big. | thrust |
| Air travels ____ over the top of the wing. | faster |
| Birds with ____ must generate more thrust in order to achieve lift | large wings |
| Air flows into your lungs as you inhale because the pressure inside your lungs | is less than that of the surrounding air, and air flows from higher to lower pressure |
| Devices that use liquids to transmit pressure from one point to another are called ____. | hydraulic |
| A plane's engine produces ____ to push the plane forward. | thrust |
| The hydraulic brakes of a car transmit pressure through fluid. This is an example of | Pascal's Principle |
| An irregular or unpredictable flow of fluids is known as | turbulence |
| The fact that a heavy steel cargo ship can carry a large load without sinking illustrates | Archimedes' principle |
| The faster moving air above an airplane's wings exerts less pressure than the slower moving air below its wings thereby creating an upward force that is called | lift |
| The forward force produced by an airplane's engine is called | thrust |
| The upward force that fluids exert on all mtter is called | bouyant force |
| ____ works against the forward force of a plane | drag |
| ____ is the amount of matter in a certain volume | density |
| Any material that can flow and takes the shape of its container is a ____ | fluid |
| The pressure caused the weight of the atmosphere is called | atmospheric pressure |
| the ____ that a liquid exerts on an object increases as the density of the fluid increases | bouyant force |
| Most bony fish have an organ called a swim bladder that allows fish to adjust their overall ____ in order to go to certain depths in the water | density |
| What forces act on an airplane? | lift ; drag ; turbulence ; thrust |
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