13.1 test Flashcards
pressure
the result of a force distributed over an area
to calculate pressure u have to
dive the force by the area over which the force acts
what is the SI unit for pressure
pascal
fluid
a substance that assumes the shape of its container
water pressures increases as
depth increases
The pressure at any depth is
constant
what is a baro meter used for
to track Earth’s atmosphere
air pressure _____ as depth ____
increases
the Earth’s atmosphere exerts pressure about
10kPa sea level
air pressure ____ as altitude _____
decreases, increases
the atmosphere is exerting ____ newtons of force on top of your head
1000
fluid exerts____
pressure equally in all directions at a given depth
what is pascals principle
a change in pressure at any point in a fluid is transmitted equally and unchanged in all directions throughout the fluid
hydraulic system
a device that useses pressurized fluid acting on pistons of different sizes to change force
how does the hydraulic system work
an increased output force is produced because a constant fluid pressure is exerted on the larger area of the output piston
what happens if u blow on a sheet of paper
the paper lifts upwards
what is bernoulli’s principe
as the speed of a fluid increases, the pressure within the fluid decreases
lift
the pressure difference between the top and the bottom of the wing created an upward force
bouyancy
the ability of a fluid to excerpt an upward force on an object placed in it
when does bouyancy occur
it results in the apprent loss of weight of an object in a fluid
what is the bouyant force
a net upward force
what is Archimedes principle
the bouyant force on an object is equal to the weight of the fluid displaced by the object
what is the SI unit for density
grams per cubic cetimeter
if an object is less dense then the fluid is it will
float
