MARCH 20, 2015Homework: None

Do Now: •Update T.O.C- pg. 86 : Energy Packet• pg. 87: Energy Diagram• pg. 88: What is pressure• Take out Energy Diagrams and Energy packets• Finish energy diagrams (if not completed)•Hole punch is being passed around- hold punch energy packets and diagram

1 2

PRESSURE = FORCE/AREA

Turn and talk:•How are force and area related to create pressure?

• Jot ideas on pg. 89

What makes snow shoes better than sneakers when walking on the snow?

PRESSURE = FORCE/AREA

•Measured in Pascals (Pa), kiloPascals (kPa), millibars, atmospheres (atm)

•Pressure is the amount of force applied on a certain area

•The larger the area the more force can be applied.

PRESSURE = FORCE/AREA

• Lets test it the relationship between pressure and surface area.

Materials: 1 pencil, 1 marker, 2 half pieces of paper.

What were your results? Why do you think you got these results?

MARCH 23, 2015Homework: Section 1 assessment questions: 1B,2B,2C

Complete on pg. 90 in binderDo Now:•Update T.O.C- pg.89- Air pressure pg. 90 Section 1 Questions•Complete check-in slip- may choose either Level 1(L1) or Level 2 (L2)(more challenging)

Fill in the sentence about the relationship between pressure &

areaBook bags with wider straps put less or more pressure on your shoulders than thinner straps because____________________________________.

THE AIR AROUND US

What is Wind?

How would you define the term fluid?

Air pressure is a type of fluid pressure.

Total force of the air (fluid) being

applied, divided by the area that force is being

exerted over.

Could the air do this?

Think about

AIR PRESSURE•Air exerts pressure because it has mass—•Gravity pulls on the airs mass giving it weight--• The weight of the air pressing down is the force that creates air pressure

Air pressure pushes on everything----Open up your hand• The weight of air you are holding in your hand is equal to the weight of a washer machine!!

Why is your hand not crushed?? Pressure is balanced on your hand in all directions

1) Draw the beaker

2) Label with arrows that point in all the directions where pressure is being applied, (either by the air (gas) or the water (liquid))

MARCH 24, 2015•Homework: Finish diagram from class answer Sect. 1 assessment questions 3A and 3B on the back.•Quiz Tuesday March 31- Chap. 3- section one- Pressure

Do Now: Agenda- Write H.W•Update T.O.C pg. 91 Relationship between Pressure, Elevation and depth• Take out Section 1 assessment questions (1B, 2B, 2C)•Copy notes about air pressure from the board onto pg. 89

AIR PRESSURE•Air exerts pressure because it has mass—•Gravity pulls on the airs mass giving it weight--• The weight of the air pressing down is the force that creates air pressure

Air pressure pushes on everything and is balanced in all directions- this is why we are not crushed by the air above us

SECTION 1 ASSESSMENT

QUESTIONS• 1b: The woman in high heels exerts more pressure because the force is exerted over a smaller area

• 2B: The pressure that the Earth’s atmosphere exerts on the body (and objects) is equal in ALL directions

• 2C: The body contains fluids too, such as, air in the lungs and blood in the veins and arteries.

Elevation- is the vertical distance between the surface of the earth and sea-level.

Altitude- is the vertical distance between an object and the surface of the earth

Pressure decreases as elevation increases-

Why?

Because there is less air above you

Water pressure increases as depth increases—Why?Because of the weight of all the water above you