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 Presentation

Transcript of STUFF MOVING: FORCES and Forces of Nature

STUFF MOVING FORCES and Forces of Nature

STUFF MOVING:FORCES and Forces of NatureChapters 9 + 17

Be Prepared to be BLOWN AWAYBy 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?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?

Why do things move + stop?

Why (else) do things move?

When things move:Tend to go from ___________ to __________Unless acted on by a forceExsThats your overview of 8th grade scienceThe rest is specificsCan you apply those ideas to things you remember from 7th grade?Cell membranesPhotosynthesisCellular respirationProtein synthesisHumans 7Ch 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 motionRandom: Moving, so have ____________Collisions: Temperature/Thermal Energy/HeatWhats the difference?Temperature

Thermal energy


Specific heat

States of Matter

Attractive forcesMolecules move (KE)Fixed arrangementsDefinite shapeDefinite volumeDensity

Changing States of Matter

Thermal expansion

Energy FlowEnergy (heat) flows from____ to _____Convection Conduction Radiation REVIEW: Polarity of water Atoms want to have ____ electronsH has _ electron, will tend to give it away to have a ____ chargeO has ___ electrons will tend to take to have a ___ chargeSome effects of the polarity of waterCohesive (sticks to other water molecules)

Affects other substances

Affects crystal form of ice

Ch 17: Weather and ClimatePlants need _____ for photosynthesisMost organisms need ___ for cellular respirationAll the gasses in the air are together called the __________________________: Gasses stay close to Earth because of _________________Stronger closer to Earth, so more gas moleculesLayers of the Atmosphere

Stuff in the atmosphereOzone

Heat: originally from________radiation From SunBack from Earth

AbsorptionSeasons:Different surfaces:

Stuff in the atmosphere: WaterGreenhouse gasCloudsPart of the water cycleDifferent kinds associated with different weather

Water cycle (why work? KE, polarity, g)

Wind- why does air move?The Earth moves

Convection currents

Air Pressure and Pressure DifferencesGlobal Winds:convection currents, Earths rotation, +friction

High and Low Pressure systemsLots of air sinking, because its cooling = more molecules in air = ____________ pressure

Lots of air rising, because its warmer = less molecules in air = _____________ pressure

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

This is a lot of background info, when do we get to the hurricane stuff?Now--- or rather, Saturday, August 27Hurricane IreneExtreme WeatherThunderstorms



Hurricanes Hurricanes form over _________ water with lots of evaporation. Kind of like a super __________ pressure system Hurricane damage is usually from: the hurricane force wind, __________, __________, or ________________ formed by the hurricane Hurricanes move along usual global wind pathways, but lose power if they travel over land or into _________water

Climate Interactions between:BiosphereAtmosphereCryosphereHydrosphereLithosphere

Climatic differencesLatitude

Prevailing winds


Climatic differencesOceans (and where they are wrt winds)


Changing ClimatesSeasonal changes

Long Term changes

Global warmingSunspot cycles

CO2 in the atmosphere + carbon cycle

Ozone hole