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energy and work done (sources of energy (renewable sources of energy…

- - - - in past, people led simple lives that required little energy. today, alot more energy has been used
      - pg 124
        
        illustrate how people have interacted with their environment to obtain energy sources to bring them benefit. but this interaction has also caused problems
        
        burning fossil fuels in vehicles and factories, while benefitting society, has also caused environmental pollution that can affect health
        
        as more energy is used, fossil fuels sources are being used up very quickly. earth's resources of fossil fuels are limited and once they have been used up, they are gone forever. they are non-renewable
        
        oil and natural gas may begin to run out in less that 50 years and coal may last another 200 yrs
  - - - electricity from moving water: dams: moving water-->pipes-->move turbines
    - - energy from sun. heat and light are 2 forms of it. used to heat water, cooking, generate electricity
    - - wind is moving air. wind turbines. kinetic energy--> electricity
    - - see pg 125
    - - steam from inside earth is used to generate electricity in geothermal power stations. geothermal water is also used as source of hot water for homes in some countries
    - - plant and animal material. can be used to produce biofuels, which are made from plants or from animal waste. fuels may be solid, liquid or gas
- - - - size of force applied
      - distance moved by object in direction of force
    - - 1 joule is work done when force of 1 newton moves object by 1 metre in direction of force
      - lager unit kJ: 1000J