Learn about buoyancy. Why does a boat made of steel float. Why don''t objects of greater density than water float

1. Buoyancy
By Daniel Chit 11IP

2. Buoyancy
• Upward net force on objects within
a liquid
• Occurs because pressure in a fluid
increases with depth
• Since the bottom is deeper, more
force is pushing up than force on
the bottom pushing down
• Net upward force pushes objects up

4. Archimedes Principle
• The buoyant force on an object is equal to the weight of the fluid displaced by the object
FB = Fw = mg
ρ = M/V
M = ρV
FB = ρVg
It is NOT the object that exerts the buoyant force, it is the fluid that the object displaces that
causes it
FB = ρfluidgVsubmerged

5. • The difference between the buoyant force
and the object’s weight determines
whether an object sinks or floats.
Sink or Float