• A fluid is a material that can flow and has no definite
shape. Ex. Gases, liquids
• Mass density equals the mass divided by the volume.
• Archimedes Principle – the buoyant force (the
upward force of liquid) exerted on objects partially or completely submerged
• The magnitude of the buoyant force is equal to the
weight of the displaced fluid.
• The buoyant force on a floating object equals the weight
of the floating object.
• Pressure is the force per unit area.
P=F/A
• The SI unit of pressure is the Pascal (Pa).
• Standard atmospheric pressure is 100,000 Pa, or 1 atmosphere.
• Pascal’s Principle – the pressure applied to
a fluid in a closed container is transmitted equally to every point of
the fluid and to the walls of the container.
• Pressure varies with depth in a fluid.
• P = phg
• Absolute pressure = atmospheric pressure + (density
X g X depth) [P=Po + pgh]
• Bernoulli’s Principle – The pressure in a fluid
decreases as the fluid’s velocity increases.
Note: the small p is actually the Greek letter
ro
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