Chapter 5: Wood Buoyancy Flashcards
to keep afloat
buoy
capable of floating
buoyant
tendency of a body to float when submerged in a fluid or the power of a liquid to exert an upward force
buoyancy
ability of a piece of wood to float due to the buoyant force that develops as a result of the difference between the density of wood and water
buoyancy
amount of force that is needed to push a piece of wood and float it in water
buoyant force of wood
factors affecting buoyancy:
a. density of water
b. volume of water displace
c. local acceleration due to gravity
General Rule of Buoyancy: if the buoyant force is greater than the object’s weight?
object rises to the surface and floats
General Rule of Buoyancy: if the buoyant force is less than the object’s weight?
object sinks
General Rule of Buoyancy: if the buoyant force equals the object’s weight?
object can remain suspended at its present
depth.
The buoyant force is always_____, whether the
object floats, sinks, or is suspended in a fluid.
present
Weight ALWAYS acts _______
downward
Buoyant Force (FB) always acts ______
upward
cork and wood is ________ buoyant
positively
iron is ________ buoyant
negatively
watermelon is _________ buoyant
neutrally
Why ship float?
Because the weight of the ship is = to the Buoyant Force and Air-filled buoyancy chambers are built
ship is built by ______________ that
makes the ship less dense than the
volume of water it occupies, thus enabling
it to float.
Air-filled buoyancy chambers
Named after the Greek mathematician and inventor
Archimedes
EUREKA
Refers to the force of buoyancy that results when a body is submerged in a
fluid, whether partially or
wholly.
ARCHIMEDES PRINCIPLE
Why does a body denser than water sinks?
because downward force due to the weight of the body is greater than the upward force
