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Physics test 3
phases of matter
| What are the 4 phases of matter | solid, definite shape and volume. Liquid definite volume but not shape. Gas no definite shape or volume. Plasma, electrified gas |
| what is compression | when you push something together which causes the object to get shorter |
| what is tension | when you pull something apart causing it to get larger |
| when a spring is stretched to 10 cm how long will it be if you double the force? | 20 |
| what is the density of an object is the mass in 12 g and volume is 25 cm? will it float? | .48g/cm^3 yes it will float |
| what affects water pressure? | the depth of an object affects water pressure |
| what does an object weigh if it floats | nothing |
| what is the weight of an object if it sinks | the weight of the object minus the weight of the water it displaces |
| what is the buoyant force equal to | the weight of the water displaced |
| what is the Bernoulli principle? | when the speed of a fluid is increased as he internal pressure is decreased |
| when a ball is thrown does it curve up or down? | down because the low pressure produced |
| how does an plane work | the path of the air on the top of the wing is longer than on the bottom causing lift |
| what is boyle's law | PV=PV |
| how do volume and pressure relate in boyle's law? | they are equal and opposite |
| what temp does water freeze at in kelvin | 273 degrees kelvin |
| what temp does water freeze at in C | o degrees C |
| what temp does water freeze at in F | 32 degrees F |
| what is absolute zero | the temp at which there is no molecular motion |
| why is water special | because it has such a high specific heat which causes it to take more time and energy to heat and the high density caused ice to float |
| evaporation | liquid to a gas |
| boiling | liquid to a gas |
| condensation | gas to a liquid |
| dew | gas to liquid |
| melting | solid to liquid |
| freezing | liquid to solid |
| sublimation | solid to a gas |
| fusion | solid to liquid |
| vaporization | liquid to gas |
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