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Page 1: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Page 2: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Section 2 Properties of Fluids

Page 3: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it https://www.brainpop.com/science/motionsforcesandtime/buoyancy/

What You’ll Learn

Page 4: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Buoyancy is the ability of a fluid (liquid or gas) to exert an upward force on an object that is immersed in it. Buoyant force = object’s weight object floats Buoyant force < object’s weight object sinks

How do ships float?

Page 5: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Who? 3rd century BC Greek mathematician who made a discovery about buoyancy

Discovered? Found that the buoyant force on an object is equal to the weight of the fluid displaced by the object

Archimedes’ Principle

Page 6: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Place wood block in water

block will push water out of the way as it begins to sink until the weight of the water displaced = the block’s weight

RESULT: buoyant force = weight of the block

FLOATS

EXAMPLE

Page 7: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Page 8: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Steel Block vs. Wood Block

Both displace same volume buoyant force is sameBUT steel sinks and wood floats- WHAT’S THE

DEAL??Density = mass / volume

Would a steel block and wood block that are both the same

volume float?

Mass Volume Density Sink or Float?

Steel 24 g 8 cm3

Wood 4 g 8 cm3

Page 9: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Pressure- def. the force exerted per unit areaPressure (N/m2) = Force (N) / Area (m2)Who? Blaise Pascal (1623-1662) French scientist

discovered the useful property of fluids Principle? Pressure applied to a fluid is transmitted

throughout the fluid. Ex: Squeeze one end of a toothpaste tube,

toothpaste emerges from the other end. The pressure has been transmitted through the fluid toothpaste.

Ex: Hydraulic machines in auto repair shops Fig 15

Pascal’s Principle

Page 10: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Who? Daniel Bernoulli (1700-1782) Swiss scientist who studied the properties of moving fluids such as water and air

Principle? As the velocity of fluid increases, the pressure exerted by the fluid decreases.

Demo Bernoulli’s principle Ex: principle used when

designing aircraft wings and hose-end sprayer (fig 17)

Bernoulli’s Principle

Page 11: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Page 12: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Viscosity – def. the resistance to flow by a fluid

Ex: cold syrup flows slow= high viscosity; heated syrup flows faster= low viscosity

Viscosity decreases as temperature increases

Fluid Flow

Page 13: Section 2 Properties of Fluids Explain Archimedes’ Principle Explain Pascal’s Principle Explain Bernoulli’s principle and explain how we use it

Section Review pg 489 #1-7

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