Warm-up viscosity lower Page 85, 1. A fluids resistance to flow is called : viscosity Page 86, 2. The faster a fluid travels the ______ the pressure it exerts. lower Page 86, 3. Daniel Bernoulli lived in the 18th century and was a _______ mathematician. Swiss

Warm-up Notes: 1. In a car’s liquid-filled hydraulic brake system, the master cylinder has an area of 0.5 cm2, and the wheel cylinders each have an areaof 3.0 cm2. If a force of 150 N is applied to the master cylinder by the brake pedal, what force does each wheel cylinder exert on its brake pad? 900 N Page 87, 2. Because gases are ______ and ______ it is easy to forget that they exist. colorless, odorless Page 86, 3. Earth atmosphere is a gaseous mixture of ________ and _________. elements, compounds

Today’s Objectives: Students will be able to… Describe buoyant force – why things float Define Archimandrites principles – how it relates to human activities - Explain the role of density State and apply pascal’s principle – drawing – where it is used/how

Activities: Warm-up / quiz Notes/discussion Video clips / discussion Phet lab solid liquid gas – review sec. 1 Concept review section 1 chap. 3

Objectives Chapter 3 Section 2 Fluids Describe the buoyant force and explain how it keeps objects afloat. Define Archimedes’ principle. Explain the role of density in an object’s ability to float. State and apply Pascal’s principle.

Chapter 3 Section 2 Fluids Math Skills, continued 3. Insert the known values into the equation, and solve. F1 = 500 N

Chapter 3 Section 2 Fluids Fluids in Motion Viscosity is the resistance of a gas or liquid to flow. Bernoulli’s principle states that as the speed of a moving fluid increases, the pressure of the moving fluid decreases. Bernoulli’s principle is illustrated below: as a leaf passes through a drainage pipe from point 1 to point 2, it speeds up, and the water pressure decreases.

Video clips https://www.khanacademy.org/partner-content/mit-k12/mit-k12-physics/v/the-forces-on-an-airplane https://video.search.yahoo.com/yhs/search;_ylt=AwrEZ7lAjA1cXxAA6H8PxQt.;_ylu=X3oDMTByMjB0aG5zBGNvbG8DYmYxBHBvcwMxBHZ0aWQDBHNlYwNzYw--?p=bernoulli+principle+you+tube&fr=yhs-pty-pty_email&hspart=pty&hsimp=yhs-pty_email#id=39&vid=2d5a1ab33957f066ff931b8191645206&action=view https://video.search.yahoo.com/yhs/search?fr=yhs-pty-pty_email&hsimp=yhs-pty_email&hspart=pty&p=bernoulli+principle+you+tube+julius+summer#id=2&vid=d77f8cb505429732219b165259d6410d&action=view http://www.aviation-for-kids.com/paper-airplanes.html

Cool down 1. Going from solid to liquid to gas what is the main change in the molecules of a substance? The amount of energy the particles have in increased – temperature overall increased 2. What happens to the spacing between particles as you cool a substance down? Particles gather closer together overall motion decreases

Cool down 1. Does a block of wood have a higher buoyancy force in water or oil ? water 2. If buoyant force is equal to the ______ of the volume of the fluid displaced. weight

Cool down 1. Why do you weigh less in water? (what is this principle called?) It has a buoyant force pushing upwards – Archimedes principle 2. Hydraulic devices are based on ____ principle Pascal’s

Cool down 1. What fluid did you use on the computer program that had the highest density? honey 2. What material placed in all fluids had the highest buoyancy force? Styrofoam

Cool down 1. On an air plane wing where is pressure the lowest? Above the wing 2. Hydraulic devices are based on ____ principle Pascal’s