march 20, 2015 homework: none do now: update t.o.c- pg. 86 : energy packet pg. 87: energy diagram...
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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
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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?
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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.
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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?
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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)
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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____________________________________.
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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.
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Could the air do this?
Think about
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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
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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))
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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
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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
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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.
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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
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Pressure decreases as elevation increases-
Why?
Because there is less air above you
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Water pressure increases as depth increases—Why?Because of the weight of all the water above you