12544666
Description
Flashcards by Kyanna Jackson, updated more than 1 year ago
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Created by Kyanna Jackson
over 8 years ago
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| Question | Answer |
| Density= | Mass/Volume |
| Density | -Important property of matter (solids, liquids, gases) -Measure of compactness of how much mass an object occupies -"lightness" or "heaviness" of materials of the same size |
| Density Example: | The density of mercury is 13.6 g/cm^3, so mercury has 13.6 times as much mass as an equal volume of water (density 1 g/cm^3). |
| Density of Water | 1 g/cm^3 |
| Volume= | Mass/Density |
| Mass= | Density x Volume |
| Pressure | Force per unit area that one object exerts on another |
| Pressure= | Force/Area |
| Pressure | -Depends on area over which force is distributed -Units in lb/ft^2, N/m^2, or Pa (Pascals) |
| Water Tower | Force of gravity acting on the water in a tall tower produces pressure in pipes below that supply homes |
| When an ice cube in a glass of water melts, the water level | remains the same |
| Buoyancy in a Liquid | Buoyancy- apparent loss of weight of a submerged object -amount equals the weight of water displaced |
| Archimede's Principle | -discovered by Greek scientist Archimedes -relates buoyancy to displaced liquid -states that an immersed body (completely or partially) is buoyed up by a force equal to the weight of the fluid it displaces |
| Apparent weight of a submerged object | weight out of water - buoyant force |
| If a 3-kg block submerged in water apparently "weighs" 1kg, then the buyoant force or weight of water displaced is 2kg | Buoyant Force= weight out of water - apparent weight. 3kg - 1kg= 2kg |
| Bouyant force is greater on an empty steel barge when it is: | floating on the surface |
| Buoyant force is greater on a submarine when it is: | submerged |
| What is the weight of water displaced by a 100-ton floating ship? | 100 tons |
| Displacement rule: | A completely submerged object always displaces a volume of liquid equal to its own volume |
| Place a stone in a container that is brim-full of water, and the amount of water overflow equals the volume of the stone | * |
| Buoyant force is equal to the weight of fluid displaced | * |
| Understood by pressure differences | greater pressure against the box- Pressure on the top of box |
| Principle of flotation | A floating object displaces a weight of fluid equal to its own weight |
| The reason a person finds it easier to float in salt water, compared with fresh water, is that in salt water: | a smaller volume of water is displaced |
| Buyoyant force- | the upward force resulting from an object being wholly or partially immersed in a fluid |
| The Archimede's Principle- | An object immersed in a fluid experiences a buoyant force equal to the weight of the volume of fluid displaced |
| Both liquids and gases are considered fluids | * |
| Objects float in fluids because an upward force acting on it is greater than the downward force of its weight | * |
| An object will float in a fluid if its average density is less than the density of the fluid | * |
| An object will sink if its average density is greater than the density of the fluid | * |
| An object will be in equilibrium at any submerged depth in a fluid if the average density of the object and the density of the fluid are equal | * |
| When an object floats, some of it is submerged, displacing enough volume so that the buoyant force equals the weight force | * |
| A fish normally displaces its own: | volume of water, and weight of water |
| Ships float because the average density of the ship is less than the water it would displace | * |
| Oil floats on water, | since oil is less dense than water |
| Cream floats on milk, | since cream is less dense than milk |
| By taking in, or pumping out water, submarines can vary their buoyancy. | * |
| Is there a buoyant force acting on your classmates at this moment? | Yes, but it is insignificant compared with their weights |
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