Magnet and Energy

Test review answers

1. Describe the 5 types of energy.

Mechanical- motionThermal- heatElectricalElectromagnetic- light/wavesChemical- reaction- make

something new (burning) (eating)

2. Describe what happens at the poles of magnets. Poles are the strongest part N repel N S repel S

N attract S

3. What types of items are magnetic?

Iron, Nickel, cobalt (steel contains Iron)

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***

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)

6. Describe energy transformations:

Candle- flame burning=

electromagnetic (light) to thermal (heat)

Windmill- mechanical to electrical

6. Describe energy transformations:

Motor = electrical to mechanical

6. Describe energy transformations:

Toaster- electrical to thermal

6. Describe energy transformations:

Flashlight- chemical (battery) to Electromagnetic (light)

Describe energy transformations:

Car- chemical

(fuel) to thermal (heat) to mechanical

Describe energy transformations:

Refrigerator- electrical to mechanical (motor) to thermal

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

Electric Power Plant

Mechanical energy from steam turns turbine

Boil water to make steam

thermal

Burn a fuel

chemical Makes electricity

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

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