13 Flashcards
what is pressure
it describes the force exerted over an area
where does pressure increase
it increases with further depth
a connected liquid in hydrostatic equilibrium will rise to what height at open regions
the same height
what is true about the pressures of a connected liquid in hydrostatic equilibrium
the pressure is the same at all points on a horizontal line through a connected liquid
what is pascals principle
it says that if the pressure at one point in an incompressible fluid is changed, then the pressure at every point in the fluid will change by the same amount
how does atmospheric pressure work
the air in the atmosphere becomes less dense with an increasing altitude
what is the buoyant force
it is the upward force of a fluid
what is true about the pressure forces in a cylinder submerged in liquid? Is the force pushing down greater than the force pushing up?
the force pushing up is greater than the force pushing down becuase the pressure is greater, this creates a net upward force
for a submerged parcel in static equlibrium, what must be true about the buoyant force
the buoyant force matches the weight force of the fluid parcel
what does the buoyant force depend on
it depends on the volume of an object and the density of the fluid
when an object is immersed in a fluid, what happens to the fluid that surrounds it
the fluid is displaced
what is the volume of the fluid displaced
the displaced fluid’s volume is the volume of the portion of the object that is immersed in the fluid
what is archimedes principle
it states that a fluid exerts an upward buoyant force on a object immersed in or floating on a liquid. The magnitude of the buoyant force equals the weight of the fluid displaced by the object
how do we predict if an object will float or sink
it depends whether the buoyant force on the object is larger or smaller than the downward weight force
If the average density of an object is greater than the density of the fluid, will it float or sink
it will sink
if the average density of an object is less than the density of the fluid, will it float or sink
it will float
if the average density of an object is equal to the density of the fluid, will it float or sink
it will hang in equillibrium and will weigh the exact amount of the fluid that it displaces
what is neutral bouyancy
when the average density of the object equals the density of the fluid and they hang in equilibrium
If the magnitude of the buoyant force is equal to the weight of the fluid displaced by the object, is the object submerged entirely or does it sink
the object could be submerged partially or entirely. The magnitude of the buoyant force is always equal to the weight of the fluid displaced by the object. This is why bouyancy is related to volume
If the magnitude of the buoyant force is equal to the weight of the amount of fluid with the same volume as an object, is the object submerged entirely or partially?
the object is completely submerged
the buoyant force is equal to the weight of the volume of the fluid displaced. If the volume of the fluid displaced is the same as the object, then the buoyant force is equal to the weight of that displaced fluid
if the magnitude of the buoyant force equals the weight of the object
then the object floats
