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Magnet and Energy
Test review answers
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1. Describe the 5 types of energy.
Mechanical- motionThermal- heatElectricalElectromagnetic- light/wavesChemical- reaction- make
something new (burning) (eating)
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2. Describe what happens at the poles of magnets. Poles are the strongest part N repel N S repel S
N attract S
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3. What types of items are magnetic?
Iron, Nickel, cobalt (steel contains Iron)
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4. Describe electromagnets. Include the parts and advantages to using one. Describe ways to change the strength of electromagnets.
uses electricity to make magnetism
battery, wire(coils), steel nail/bolt
Advantage- turn off and on
Change the strength- more coils***
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5. What is the difference between Renewable and Non-renewable resources? Give examples of each.
Renewable- get more of it- solar, biomass, wind, geothermal, Hydrogen, hydroelectric
Nonrenewable- can not get more of it- nuclear & fossil fuels (coal, oil, natural gas)
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6. Describe energy transformations:
Candle- flame burning=
electromagnetic (light) to thermal (heat)
Windmill- mechanical to electrical
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6. Describe energy transformations:
Motor = electrical to mechanical
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6. Describe energy transformations:
Toaster- electrical to thermal
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6. Describe energy transformations:
Flashlight- chemical (battery) to Electromagnetic (light)
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Describe energy transformations:
Car- chemical
(fuel) to thermal (heat) to mechanical
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Describe energy transformations:
Refrigerator- electrical to mechanical (motor) to thermal
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Describe energy transformations:
Fan- electrical to mechanical
Power plant- chemical (burn fuel – thermal energy to boil water) to mechanical (steam turns the turbine) to electrical p. 293
Study picture
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Electric Power Plant
Mechanical energy from steam turns turbine
Boil water to make steam
thermal
Burn a fuel
chemical Makes electricity
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7. Describe the steps of the scientific method. Give an example of each step.
Problem- ask question Hypothesis- if …then… Experiment- step-by-step procedures Variables- control (comparison)
constants (keep the same) Organize data- table and graph Conclusions- what did you learn
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8. What is the difference between the manipulated and responding variable?
Manipulated Variable- what you change on purpose
Ex: number of coils Responding variable- data, what you are
measuring Ex: number of paperclips