stuff moving: forces and forces of nature
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STUFF MOVING: FORCES and Forces of Nature. Chapters 9 + 17. Be Prepared to be. BLOWN AWAY By how much you already know about physical science! (a little hurricane humor). If a hockey puck sits on the ice…. Will it start moving? If it starts moving, will it stop moving? - PowerPoint PPT PresentationTRANSCRIPT
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STUFF MOVING:
FORCES and Forces of NatureChapters
9 + 17
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Be Prepared to be
BLOWN AWAYBy how much you already know
about physical science!(a little hurricane humor)
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If a hockey puck sits on the ice….• Will it start moving?• If it starts moving, will it
stop moving?• Would it be harder to
stop a normal puck or a 100X bigger puck?
• What would happen to your stick if you hit the bigger puck?
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Why do things move + stop?
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Why (else) do things move?
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When things move:
• Tend to go from ___________ to __________– Unless acted on by a force
• Ex’s
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That’s your overview of 8th grade science
• The rest is specifics• Can you apply those ideas to things you
remember from 7th grade?– Cell membranes– Photosynthesis– Cellular respiration– Protein synthesis– Humans
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Ch 9: Heat and States of MatterThings we need to know (some is review)
• Kinetic Theory: matter (stuff the Earth is made of) is comprised of particles (atoms, molecules, and ions) that are always in random motion– Random: – Moving, so have ____________– Collisions:
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Temperature/Thermal Energy/Heat
• What’s the difference?– Temperature
– Thermal energy
– Heat
– Specific heat
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States of Matter
Attractive forces
Molecules move (KE)
Fixed arrangements
Definite shape
Definite volume
Density
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Changing States of Matter
Thermal expansion
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Energy FlowEnergy (heat) flows from____ to _____
Convection Conduction Radiation
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REVIEW: Polarity of water
• Atoms want to have ____ electrons• H has _ electron, will tend to give it away to
have a ____ charge• O has ___ electrons will tend to take to have a
___ charge
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Some effects of the polarity of water
• Cohesive (sticks to other water molecules)
• Affects other substances
• Affects crystal form of ice
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Ch 17: Weather and Climate
• Plants need _____ for photosynthesis• Most organisms need ___ for cellular
respiration• All the gasses in the air are together called the
__________________________: • Gasses stay close to Earth because of
_________________• Stronger closer to Earth, so more gas molecules
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Layers of the Atmosphere
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Stuff in the atmosphere• Ozone
• Heat: originally from________– radiation • From Sun• Back from Earth
– Absorption• Seasons:• Different surfaces:
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Stuff in the atmosphere: Water• Greenhouse gas• Clouds– Part of the water cycle– Different kinds associated with different weather
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Water cycle (why work? KE, polarity, g)
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Wind- why does air move?
• The Earth moves
• Convection currents
• Air Pressure and Pressure Differences
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Global Winds:convection currents, Earth’s rotation, +friction
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High and Low Pressure systems• Lots of air sinking, because it’s cooling = more
molecules in air = ____________ pressure
• Lots of air rising, because it’s warmer = less molecules in air = _____________ pressure
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High + Low systems, air flowThings tend to move from _____ to ________1. Causes winds when large masses of air move
from a large H to a large L2. Around a high or low, air will move ________
a H and _________ from a L3. Revolution of the Earth causes flowing air
around a H or L to bend = Coriolis Effect
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This is a lot of background info, when do we get to the hurricane
stuff?• Now--- or rather,
Saturday, August 27
•Hurricane Irene
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Extreme Weather• Thunderstorms
• Hail
• Tornados
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Hurricanes • http://www.brainpop.com/science/weatherandclimate/
• http://www.cotf.edu/ete/modules/sevweath/swhoware.html • Hurricanes form over _________ water with lots of evaporation. Kind of
like a super __________ pressure system
• http://www.cotf.edu/ete/modules/sevweath/swdamage.html • Hurricane damage is usually from: the hurricane force wind, __________,
__________, or ________________ formed by the hurricane
• http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/hurr/mvmt.rxml • Hurricanes move along usual global wind pathways, but lose power if they
travel over land or into _________water
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Climate
• Interactions between:– Biosphere– Atmosphere– Cryosphere– Hydrosphere– Lithosphere
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Climatic differences• Latitude
• Prevailing winds
• Precipitation
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Climatic differences• Oceans (and where they are wrt winds)
• Mountains
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Changing Climates
• Seasonal changes
• Long Term changes
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Global warming
• Sunspot cycles
• CO2 in the atmosphere + carbon cycle
• Ozone hole