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 Get ready for a quiz….

(c) McGraw Hill Ryerson 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 Oil has a larger viscosity than water, therefore oil has a slower flow rate. 2

(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. 3

(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 The water’s surface tension allows this insect to remain supported. 4

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