1. http://www.planetseed.com/files/flash/science/lab/liquids/visco_exp/en/viscosity.htm?width=620&height=500&popup=true

2.  Property that describes a liquid’s thickness or thinness  Property of all fluids  liquids and gases

3.  When do we use our knowledge of viscosity on a daily basis?

4.  The time it takes for the fluid to flow from one point to another  Predict the flow rate of the following fluids:  Paint  Water  Oil  Molasses  Vegetable Oil

5.  Different fluids flow at different rates because they have different viscosities  Resistance to flow creates internal friction  Goes back to the particles  The particles of water can slip past each other easier than the particles of oil  This is because the particles of oil are more attracted to each other than the particles of water

6.  According to the Particle Model, as the temperature of the material increases  attractive forces decrease  Increase Temperature= Decrease Attraction  Decrease Temperature = Increase Attraction  The viscosity of a liquid DECREASES as it is HEATED and INCREASES as it is COOLED

7.  Remember that there is already lots of space between gas particles so attractive forces are low  The viscosity of a gas INCREASES as it is HEATED and DECREASES as it is COOLED.  That means that temperature has the opposite effect on the viscosity of gases as on liquids

8.  Read pg 36 and do the questions on pg. 37  Questions: 1, 2, 5(a,b,c)  Do the question on page 39  1 (a-h), 3(a), 6(a,b,c,g)  Make sure you have your glossary complete up to page 49  Do questions on page 49  1, 2,3,4(a,b), 6  When you are done start to make a crossword puzzle with the Words from your glossary.

10.  Buoyancy is the force exerted by a fluid  Measured in Newton's (N) Buoyant Force: Upward force exerted on objects submerged in fluids

11.  Floating is when an object doesn’t fall in air or sink in water but stays suspended in the fluid

12. The key is average density!

13.  Archimedes was required to determine whether a crown made for the king was pure gold  Step 1: weighed the crown  Step 2: dropped the crown in water to determine the volume of the water displaced.  Step 3: Volume of the displaced water is equal to the volume of the object in water.  Step 4: Compared the volume of the water displaced by the crown to the water displaced by an equal mass of pure gold  Step 5: Crown maker executed

14.  The buoyant force acting on an object equals the weight (force of gravity) of the fluid displaced by the object

15.  Displacement is the measure of the amount of water an object will push out of it’s way when the object is placed in water

16.  http://www.gamequarium.org/cgi- bin/search/linfo.cgi?id=7898 http://www.gamequarium.org/cgi- bin/search/linfo.cgi?id=7898  http://www.gamequarium.org/cgi- bin/search/linfo.cgi?id=7899 http://www.gamequarium.org/cgi- bin/search/linfo.cgi?id=7899  http://www.gamequarium.org/cgi- bin/search/linfo.cgi?id=7900 http://www.gamequarium.org/cgi- bin/search/linfo.cgi?id=7900  http://www.pbs.org/wgbh/nova/lasalle/buoyqu estion.htm http://www.pbs.org/wgbh/nova/lasalle/buoyqu estion.htm

17.  Page 69  Questions: 2, 5a, 5b,  Wrap Up pg. 70  Understanding Key Concepts  Questions: 1-5, 7, 9 Design your Boat Project  Homework

19.  Pressure can be calculated by using the following formula  P = F / A [ 1 N/m 2 = 1Pa = 0.001 kPa ]  Measured in Newtons (N)  The Unit for pressure is:  This unit is also called a Pascal

20.  The following is required for the compression of gas:  Gas must be enclosed in a sealed container.  Lots of space between particles  There must be an external force applied to the enclosed gas Gases are compressible because their particles can be squeezed closer together  We say gases are compressible As pressure increases, the volume of the gas decreases.

21.  The particles in solids and liquids can not be pushed closer together  Solids and liquids are said to be  Incompressible  The volume does not change, and the pressure is exerted everywhere on the container's inner surface (this is fluid pressure)

23.  Pascal's principle  Pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid, as well as to the walls of the container.

24.  Air pressure changes with altitude  As you climb higher the atmosphere contains fewer particles so the pressure goes down. http://www.teachersdomain.org/asset/ess05_vid_nooxygen/

25.  The most common device for measuring air pressure is a barometer

26.  Hydraulics is the study of pressure in liquids.

27.  Page 77:  Questions: 1, 2ab, 3. Challenge Question  5 Page 84: Questions: 1, 2, 4, 6 Page 85: Questions: 1 a-j, 3, 4, 8 Extra Practice Density and Pressure: - Worksheet