Flashcards
pressure and pressure differencces
Cards in this deck (20)
- 1what is a fluida fluid can either be a liquid or a gas
- 2what are the particles like in a fluid(collisions)as particles move around in a fluid they collide with the surface of objects in the fluid or the surface of the container.The collision creates a force normal (at right angles) to the surface
- 3what is the equation for pressure in terms of the link between pressure,force and areapressure=force normal to a surface/area of that surface
- 4what happens if the pressure acts on a bigger areait will produce a larger force
- 5what is the atmospherethe atmosphere is a repetitively thin layer of air around the earth
- 6finish the sentence... the greater the altitude,________the greater the altitude, the less dense the atmosphere and the lower the atmospheric pressure
- 7what is is like at high altitudeat high altitude there is less air above a surface than at lower altitudes, so there is a smaller weight of air acting on the surface
- 8what does high altitude do to the equation p=f/ait will result in a lower pressure
- 9what does the pressure at a particle point in a column of liquid depend on-the height of the column above the point
-the density of the liquid - 10what happens the higher the column and the more dense the liquid-the greater the weight above the point
-the greater the force on the surface at the point
-the greater the pressure - 11write the equation that helps calculate pressurepressure=height of the column*density of the liquid*gravitational field strength
- 12what is upthrust
- 13what indicates if an object will float or sinkits density
- 14when does an object floatan object floats when its weight is equal to the upthrust
- 15when does an object sinkan object sinks when its weight is greater than the upthrust
- 16whats happens if an object is less dense than a liquid-displaces a volume of liquid greater than its own weight so it will rise to the surface
-will float with some of the object remaining bellow the surface
-displaces liquid of equal weight to the object - 17if an object has a low density and it is placed in water what will happenmore of the object will remain above the surface
- 18why would some objects sink in watera object denser than the surrounding liquid cannot displace enough liquid to equal its own weight so it sinks
- 19finish the sentence... no matter how dense an object is,the size of the upthrust is__________equal to the weight of the liquid displaced
- 20list a object that will a-float b-mostly under the water but top part floats c-sinksa-polystyrene
b-ice
c-iron
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- GCSE physics new Flashcards on pressure and pressure differencces, created by ella stokes on 18/11/2017.
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- ella stokes
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