Liquids Quiz a (01.20.2021) Flashcards
___ is the force per unit area that one object exerts on another
pressure
pressure equals…
force / area
pressure depends on…
area over which force is distributed
3 main units for pressure
N/m^2, lb/ft^2, or Pascals
Why does a person lying on nails remain unharmed?
force is applied over many nails; combined surface area of the nails results in a tolerable pressure and does not punture the skin
if you stand on one foot instead of two, force you exert on the floor is the ____, but pressure you exert is ___
same; more/twice
pressure in a liquid is the force per unit area that a liquid exerts on an object; it is ____ dependent not ___dependent
depth; volume
swim twice as deep, then twice as much weight of water above you produces ___ as much pressure on you
twice
liquid pressure =
weight density x depth
weight density =
weight / volume
pressure in a liquid is independent of ______
shape of container; whatever the shape of a container, pressure at any particular depth is the same
water pressure provided by a water tower is greater if the tower is ____
taller
water pressure acts ____ to surfaces of a container. liquid spurts at right angles form a hole in the surface
perpendicular
the greater the depth, the ____ the existing speed
greater
buoyancy is…
the apparent loss of weight of a submerged object
buoyancy amount equals the________
weight of the water displaced
displacement rule: a completely submerged object always displaces…
a volume of liquid equal to its own volume
place a stone in a container that is brimful of water, and the amount of water overflow ____ the volume of the stone
equals
buoyant force is…
the net upward force that a fluid exerts on an immersed object
buoyant force is equal to the….
weight of water displaced
the difference in the upward and downward forces acting on the submerged block is the same at any depth. How many forces act on a submerged body at rest in a fluid?
two - buoyancy and the force due to gravity
When weight of submerged object is greater than the buoyant force, the object ____
sinks
When the weight of a submerged object is equal to buoyant force - object will rremain at any level and will______
neither sink nor float
when the weight of submerged object is less than the buoyant force it would have when submerged, the object ____
floats
when floating, buoyant force equals _____
weight of floating object
Archimedes Principle relates buoyancy to displaced liquid. It states that an immersed body (completely or partially) is buoyed up by _____ - it applies to gases and liquids
a force equal to the weight of the fluid it displaces
