1. Iceberg What portion is Submerged?????
density of ice x 100% density of sea water 0.92 g/mL x 100% 1.03 g/mL = 89% Why does it Float??????

2. Buoyancy
Sections 4.10 and 4.11

3. Buoyancy
when something is put into a fluid (liquid or gas), the fluid is pushed aside (displaced) to make room
the volume of fluid pushed aside is equal to the immersed volume of the object
the displaced fluid pushes back in all directions on the object
the upward force that a fluid exerts on an object is called buoyancy

4. Gravity Acting on Objects in a Fluid
if the buoyant force is greater than the object’s weight, then the object will rise until it floats (i.e. the weight of fluid being displaced by the object is greater that the weight of the object)
means that the object is less dense than the fluid

5. Archimedes’ Problem
About 250 B.C., the king of Syracuse, on the island of Sicily, suspected that his goldsmith had secretly kept some of the gold meant for the royal crown and replaced it with a cheaper metal
The king asked Archimedes, a Greek mathematician, to determine whether the crown was indeed made of pure gold
Took a bath and…..

6. Types of Buoyancy
ball A has positive buoyancy and will rise since buoyant force > weight
ball B has neutral buoyancy and will remain level since buoyant force = weight
ball C has negative buoyancy and will sink since buoyant force < weight

7. Making Dense Objects Float - Boats
you can make a dense object float by changing its shape so that it has more overall volume and thus less density

8. Why did the Titanic sink?

9. Submarines
a submarine is able to control its overall density by taking on or pumping out water (called a ballast)

10. Temperature and Buoyancy
as you increase the temperature of a fluid, it becomes less dense
Therefore the buoyant force decreases with an increase in temperature
i.e. objects aren’t as buoyant in warmer fluids as they are in cooler fluids