Which of the following statements is true. (There is only one right answer.) Read carefully: Some are partly true, but not overall. Some are also only a bit different from others.
Which of the following statements is true. (There is only one right answer.) Read carefully: Some are partly true, but not overall. Some are also only a bit different from others.
| A |
For there to be lift on an object, the outside air must be still. |
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| B |
"Lift" occurs because of a pressure difference due to fluid moving at different relative speeds on top and bottom of and object. Fluid moving at higher speed results in more pressure than the same fluid moving at lower speed. |
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| C |
"Lift" occurs because of a pressure difference due to fluid moving at different relative speeds on top and bottom of and object. Fluid moving at lower speed results in more pressure than the same fluid moving at higher speed. |
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| D |
"Lift" is the same thing as "Buoyant force," but we use the word lift when the fluid is a gas instead of a liquid. |
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| E |
Lift occurs on any object moving in a fluid at high speed. Fast moving fluid always provides an upward force. |
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| F |
While lift is important to understanding physics, it has no practical applications. |
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| G |
Bernoulli's Principle explains pressure in fluids and relates lift to buoyant force. Both are due to pressure differences; in the case of buoyant force, this difference is because of fluid speed. |
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| H |
The magnitude of lift on an airplane is proportioanl to the weight of the airplane. |
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| I |
Lift for an airplane is provided by the propellors or jet engines. |
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