forces - pressure in fluids and floating and sinking Flashcards
what is the unit of pressure
pascal
what is the atmosphere
a thin layer of air round the earth
where is the atmosphere most dense
at the surface if the earth
what is the pressure of the atmosphere caused by
the air molecules colliding with a surface
what happens to the number of air molecules above a surface as it increases height above ground level
decreases
why do crisp packets swell up on a plane
because the air pressure is lower on the plane compared to the ground
if you had a bottle of water, and poked holes in it top middle and bottom where would the water squirt out further and why
it would squirt out further from the bottom as it has a higher pressure
why does the pressure of a liquid increase with depth
as the depth increases there is a greater weight acting down on the liquid
what makes an object float
the upthrust has to equal the objects weight
what happens if the upthrust is less then the objects weight
the object will sink
when placing an object in water why would the water rise
the object has displaced the water
the size of the upthrust acting on the object = ?
is the same as the water displaced by the object
