Buoyancy

1. Buoyancy

2. Buoyancy
•Buoyancy: The decrease in weight (gravitational
force) caused by the buoyant force. (example:
floating in a swimming pool)
•Buoyant force: The upward force on an object
produced by the surrounding fluid.

3. Buoyant force animation
•Buoyancy animation:
buoyant force animation
•Density of water = 1g/ml So…
–Density > 1, the object sinks
–Density < 1, the object floats
–Density = 1, the object has neutral buoyancy.
It neither floats nor sinks; it hovers in the
middle.

4. Calculating the Buoyant Force

Archimede's Principle:
The buoyant force acting
on a submerged object
is equal to the weight of
the volume of fluid
displaced by the object.
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Archimede’s Principle

5. Density and Buoyancy of Fluids
•The same principles
apply to fluids
•Example: During the
recent oil spill, the oil
floats to the surface
and can be
“vacuumed.”
Oil Spill

6. Assignments
•Complete at home
density of fluids lab
•Email photos /video and
analysis questions and
conclusion
Density column