The Plan… 28 May 2013

• Bill Nye – Pressure – Quiz Bill! Bill! Bill! Quiz! Quiz! Quiz! Quiz!

• Review last night's homework CYU P. 299 & RC P. 296

• Section 8.3 Viscosity, Adhesion & Cohesion Worksheet 8.3

We’ll Review Tomorrow

• Activities: Act 8.9 Flowing Fluid Floods City

Do on your own Act 8.10 Floating Paper Clip

Do with a partner, hand in one copy(c) McGraw Hill Ryerson 2007

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Get ready for a quiz….

(c) McGraw Hill Ryerson 2007

8.3 Viscosity, Adhesion, and Cohesion

• Viscosity is the resistance of a fluid to flow.• Some fluids flow more easily than others

because: Particles of different fluids have different shapes. Particles in some fluids are attracted to each other

more strongly.

• The flow rate is the speed at which a fluid flows from one point to another. The slower the

flow rate the greater the viscosity.

See pages 300 - 301

Oil has a larger viscosity than water, therefore oil has a slower flow rate.

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(c) McGraw Hill Ryerson 2007

The Effect of Temperature on Viscosity

Temperature effects the viscosity of materials as follows:

• Liquids Heated viscosity decreases Cooled viscosity increases

• Gases Heated viscosity increases Cooled viscosity decreases

See page 302

Temperature effects how easily a liquid pours.

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(c) McGraw Hill Ryerson 2007

Adhesion and Cohesion

• Adhesion and cohesion affect the flow rate of liquids.

• Adhesion is the attraction of two different objects or fluids to each other.

• Cohesion is the strength with which the particles of an object or fluid attract each other.

• Surface tension is the property of a liquid in which the surface of the liquid acts as a thin skin due to cohesion.

See pages 304 - 305

The water’s surface tension allows this insect to remain supported.

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Now you have some work to do…

• Activities: Act 8.9 Flowing Fluid Floods City P 303

Do on your own Act 8.10 Floating Paper Clip P 305

Do with a partner, hand in one copy Hand back paper clip• I will demonstrate…

• 8.3 Worksheet Due Tomorrow

• Finish your Vocab!!

(c) McGraw Hill Ryerson 2007

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