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Bellwork: September 3, 2013

This lesson explores the impact of different energy sources on our environment and society. Students will investigate the effects of playing with deflated basketballs on speed, measure variables, and analyze renewable resources like solar, wind, hydro, geothermal, and tidal power. They'll also contrast these with fossil fuels, understanding the implications for the carbon footprint and sustainability. The session culminates in a thoughtful response to a documentary on oil, evaluating biases and personal feelings regarding energy issues and the future of our planet.

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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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