the result of a force distributed over an area
the SI unit for pressure; very small
a substance that assumes the shape of its container
a change in pressure at any point in the fluid is transmitted equally and unchanged in all directions throughout the fluid
how does pressure in fluids vary with depth and altitude?
air pressure decreases as the altitude increases
a device that uses pressurized fluid acting on pistons of different sizes to change a force
as the speed of a fluid increases, the pressure within the fluid decreases; ex: spray bottles. shower curtain sucking in, airplane wing
how do wings produce lift?
the air traveling over the top of the wings moves faster than the air passing underneath, creating an upward force known as lift
the ability of a fluid to to exert an upward force on an object placed in it
when an object in water is easier to lift, it is because the water is exerting an upward force, or buoyant force
the buoyant force on an object is equal to the weight of the fluid displaced by the object
how is density related to buoyancy?
if an object is less dense than the fluid its in, it will float; if the object is more dense, it will sink
how is an object suspended in water?
when the buoyant force is equal to weight, the object floats
why does a Cartesian Diver sink?
when pressure is exerted on the liquid, the air in the diver compresses and therefore the entire diver becomes denser than the liquid around it -> it sinks
why does a curveball curve?
with the top or side spin on the ball, one side is receiving resistance more than another; the side receiving the resistance creates a high pressure system, and the other side a low pressure system; pressure moves form high to low (side to side), creating the curve