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Ty Phy Sci Chpt 7
Forces in Fluids
| Question | Answer |
|---|---|
| any material that can flow and that takes the shape of its container | fluid |
| the amount of force exerted on a given area; calculated by dividing the force that a fluid exerts by the area over which it is exerted | pressure |
| the SI unit for pressure; the force of one newton exerted over an area of one square meter | pascal |
| the pressure caused by the weight of the atmosphere | atmospheric pressure |
| the amount of matter in a certain volume, or mass per unit volume | density |
| states that a change in pressure at any point in an enclosed fluid will be transmitted equally to all parts of that fluid | Pascal's principle |
| How do particles of a fluid exert pressure on a container? | The moving particles in a fluid collide against each other and against the sides of the container, causing pressure |
| Why are you not crushed by atmospheric pressure? | The pressure exerted by the fluids in your body works against it. |
| Explain why dams on deep lakes should be thicker at the bottom that at the top. | Water pressure increases with depth. |
| When you squeeze a balloon, where is the pressure inside the balloon increased the most? | Pascal's principle tells us that the pressure is increased equally at all points. |
| the upward force that fluids exert on all matter | buoyant force |
| states that the buoyant force on an object in a fluid is an upward force equal to the weight of the volume of fluid the object displaces | Archimede's principle |
| An object weighs 20 N. It displaces a volume of water that weighs 15 N. What is the buoyant force on the object? Will it sink or float? Why? | 15 N; It will sink because its weight is greater than the buoyant force acting on it |
| states that as the speed of a moving fluid increases, its pressure decreases | Bernoulli's principle |
| an upward force on an object that upposes the downward force of gravity | lift |
| the forward force produced by an airplane's engines; opposes drag | thrust |
| the force that opposes or restricts motion in a fluid | drag |
| What happens to fluid pressure as the fluid speed increases? | It decreases |
| What force opposes motion through a fluid? | drag |
| What forces act on an aircraft? | lift, thrust, drag, and gravity |
| When an airplane is flying, how does the pressure above a wing compare with that below the wing? | the pressure above the wing is lower due to the shape of the wing and the speed of the air movement |
Created by:
beth2244
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