motion in fluid Flashcards
(26 cards)
buoyant force is due to
immersion
dynamic force is due to
relative motion in fluid
what is the buoyant force
vertical, upward force acting upon and object that is submerged in fluid
is equal to the weight of the volume of fluid displaced by the object
what is archimedes principle
a body submerged in a fluid will be buoyed up by a force that is equal in magnitude to the weight of the displaced water.
the deeper you are submerge the _ the pressure is
greater and is pushes on you upward, downward and from both side
if an object dont weight enough to balance the diff between the upward or downward force what happen
it will accelerates upward and be positive buoyant
If the weight of the object is greater than the weight of the water what happen
accelerate downward and be negatively buoyant
If the object has the same weight as the displaced water
will have no tendency to either float or sink. This object is said to be neutrally buoyant.
archimede principle is based on 2 considerations
weight of object, amount of water displaces
what is specific gravity
ratio or density of the substance to the density of water
something with a specific gravity of 1.0 or less will float or sink
float
where is located the center of buoyancy
superiorly to the center of gravity
the line of action of gravitional force througth the center of gravity will be vertically _
downward
The line of action of buoyant force through the center of buoyancy will be vertically
upward
the perpendicular component is the
the parallel component is the
lift
drag
what is the drag force
parallel component of dynamic fluid that act in the opposite direction of a system motion in respect of the fluid
what is the lift force
perpendicular component of dynamic fluid force that acts in any direction that is perpendicular to the system motion with respect to the fluid.
which force tend to resist motion of the system through the fluid
drag, it tends to slow down the relative velocity of an object
the greater the _ in velocity of molecule and the _ the rate of this _ the _ the total drag
greater, faster, decrease, greater
what is the form drag
equivalent to the sum of the impact forces resulting from the collisions between the fluid molecules and the object.
what is the surface drag
as equivalent to the sum of the friction forces acting between the fluid molecules and the surface of the object
what is the surface drag
as equivalent to the sum of the friction forces acting between the fluid molecules and the surface of the object
which force tend to change the direction of system motion
lift
what create the upward lift
more particule under the object
