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| forces are not equal, the object moves |
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| forces are equal and opposite, the object does not move |
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| forces in opposite directions = subtract |
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| forces in same directions = add |
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distance/time
(top in bottom out...distance in, time out) |
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total distance divided by total time
*last set of data in data table or last point on graph* |
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| speed graphs: horizontal line |
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| speed graphs: straight line |
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| speed graphs: downward line |
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| speed graphs: curve upwards |
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| speed graphs: curve downwards |
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| speed graphs: steeper slope |
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flat, sloped surface
decreases work by increasing distance
less steep = less force |
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grooved wheel and rope
changes direction of force
more pulleys = less force |
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| law of conservation of energy |
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energy can't be created or destroyed
it only changes forms |
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| transformation in a flashlight |
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| chemical to electrical to radiant |
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| transformation in a plant |
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| tranformation in a wind turbine |
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| when heat moves through touch (direct contact) |
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up and down movement of gases and liquids
heat rises, cold sinks (think about the arrows) |
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| when heat moves through light (electromagnetic radiation) |
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warmer to cooler until everything is the same temperature
example: ice melting in a glass of water |
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| coal, natural gas, petroleum (oil) |
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| advantages/disadvantages: fossil fuels |
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adv: reliable, lots of energy, inexpensive
dis: pollution, nonrenewable |
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| advantages/disadvantages: nuclear |
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adv: reliable, lots of energy, inexpensive, no pollution
dis: hazardous waste, potential for disaster |
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| advantages/disadvantages: solar |
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adv: no pollution, renewable, free energy
dis: expensive to install, doesn't work at night |
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| advantages/disadvantages: wind |
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adv: inexpensive, renewable, no pollution
dis: not reliable, can kill birds |
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| advantages/disadvantages: hydroelectric |
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adv: no pollution, renewable, reliable, free after built
dis: expensive to build, affect wildlife |
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| advantages/disadvantages: geothermal |
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adv: no pollution, almost free
dis: limited places, hazardous materials may come up |
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| advantages/disadvantages: biomass |
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adv: cheap, already have it
dis: not a lot of energy, pollution |
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| inclined pulleys: the smaller the angle... |
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