1. Physical Science 9 Chapter 16:Solids, Liquids, and Gases
Section 16.2: Properties of Fluids

2. Buoyancy --Buoyancy is the ability of a fluid (gas or liquid)
to exert an upward force on an object
immersed in the fluid.
--An object will float if its weight is less than
the buoyant force the fluid exerts on the
object.
--An object will sink if its weight is more that
the buoyant force the fluid exerts on the
object.

3. --Archimedes’ principle says that the buoyant
force on an object is equal to the weight of
the fluid displaced by the object.
--An object will float if its density is less than the
density of the fluid it is placed in.

4. Pascal’s Principle --Pascal’s principle says that the pressure
applied to a fluid is transmitted throughout
the fluid.
--Pressure is force per unit area.
--Hydraulic machines use Pascal’s principle
to lift heavy loads.

5. Bernoulli’s Principle
--Bernoulli’s principle says that as the
velocity of a fluid increases, the pressure
exerted by the fluid decreases.
--Bernoulli’s principle explains how airplanes
that are heavier than air are able to fly.

6. --Because of the shape of an airplanes wing,
air moves over the top of the wing faster
that it moves along the bottom of the wing.
--This produces a lower pressure on the top of
the wing, producing an upward force called
lift that keeps the airplane in the air as long
as it keeps moving fast enough.

7. Viscosity --The viscosity of a liquid is the resistance
of the liquid to flow.
--The viscosity of a liquid is determined by
the attractive forces between the molecules
of a liquid.
--Molecules with strong attractive
forces have a higher viscosity. (ex: syrup,
molasses)
--The viscosity of a liquid decreases as the
temperature of the liquid increases.