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Bellwork: September 3, 2013

Bellwork: September 3, 2013. Does playing with a deflated basketball decrease your speed? You measure your speed while dribbling a normal and deflated basketball and then you measure your speed while dribbling a deflated basketball. What is the independent variable?

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Bellwork: September 3, 2013

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  1. Bellwork: September 3, 2013 Does playing with a deflated basketball decrease your speed? You measure your speed while dribbling a normal and deflated basketball and then you measure your speed while dribbling a deflated basketball. • What is the independent variable? • What is the dependent variable?

  2. Alternate Energy Sources • Fossil Fuels are non-renewable resources • They include coal, natural gas, and petroleum • Use of these makes up your “Carbon footprint” • Fossil fuels supply 90% of the world’s energy. • Most estimates say that we only have about 50 years left. • What is Energy? The ability to do work

  3. Video Questions • Summarize the main points of Crude, the Incredible Journey of Oil • Response Provide your thoughts and feelings about the issues discussed. Did you feel there was any bias? If so, explain.

  4. I. Solar Energy • What it is: • Use of the sun’s energy for power. • Advantages: • FREE and NON-POLLUTING. • 80% of Israel’s home heat water by solar energy

  5. DISADVANTAGES: • the equipment is expensive • need back up power on dark, cloudy days and at night.

  6. II. Nuclear Power • What it is: • Fuel comes from Uranium-235. A chain reaction of splitting atoms (Nuclear Fission)

  7. Fission releases an enormous amount of energy. • It must be controlled. • Controlled by neutron absorbing rods which move in and out of the reactor.

  8. The energy drives steam turbines that turn electrical generators.

  9. Nuclear power meets about 7% of the US energy demand • Disadvantages: • cost, disposal of nuclear wastes, concerns over accidents. • Advantages: • clean, doesn’t pollute air

  10. III. Wind Power • What it is: wind • People have used wind power for centuries to sail ships, power windmills and grind grain • Advantage: • Wind power could meet 5-10 % of US Electricity demands

  11. Disadvantages: • noise, cost of land needed for wind farms,

  12. Treehugger.com

  13. IV. Hydroelectric • What it is: • Power that falling water generates • Advanatges: • Supplies about 5 % of US energy • Dams allow controlled flow of water • Water represents POTENTIAL (stored ) Energy.

  14. Disadvantages: • rivers deposit sediments behind dams which fills up the reservoir. • Hard to find suitable sites • Harms fish

  15. V. Geothermal Energy • What it is: • Energy from underground reservoirs of steam and hot water. • Hot water is used for heating and turning turbines to generate electrical power. • Advantages: • Geothermal power is clean • Disadvantages: • not rechargeable. The steam and hot water “run out”

  16. In Iceland: treehugger.com

  17. V. Tidal Power • A dam is constructed across the mouth of a bay or estuary. • The tide represents moving water…the ability to do work.

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