WA1 Chapters 8, 9 & 11.1

avatar
Created by
Sarah Ng

Cards (18)

  • SI Unit of Forces:
    newton (N)
  • Forces applied in the direction of motion result in
    Work done
  • SI Unit of work done:
    joule (J)
  • What does work done results from
    transfer of energy
  • forces are measured using
    spring balance and scales
  • examples of contact forces are

    Friction and elastic force
  • examples of non-contact forces are
    gravitational and magnetic force
  • Changes forces can cause
    Start a stationary object
    turning effect in an object
    change in size and/or shape of an object
    pressure on an object
  • Pressure formula
    pressure= force/area
  • Sources of energy
    fossil fuels
    solar energy
    hydroelectric energy
    wind energy
    geothermal energy
    biofuels
    nuclear energy
  • advantages and disadvantages of fossil fuels
    Advantages:
    cheap
    Disadvantages:
    releases air pollutants and greenhouse gases
    limited and will run out one day
  • advantages and disadvantages of solar energy
    advantages:
    doesn’t produce air pollutants or greenhouse gases
    disadvantages:
    takes up a lot of space
    unreliable
    expensive
    toxic waste is generated during production
  • advantages and disadvantages of hydroelectric energy
    Advantages:
    produces little greenhouse gases
    Disadvantages:
    reservoir water behind the dam may flood the surrounding area
    kills plants
    forces animals to move
    people have to relocate
  • Advantages and disadvantages of wind energy
    Advantages:
    little greenhouse gases released
    disadvantages:
    large plots of land needed
    loss of wildlife
    noisy
  • advantages and disadvantages of geothermal energy
    advantages:
    always available
    little maintenance
    disadvantages:
    uses large plots of land
    destroys habitats
    traces of toxic elements may be drawn out
  • advantages and disadvantages of biofuels
    advantages:
    plants used to make biofuels can be grown in a short time
    can be made from used cooking oil and other food waste
    disadvantages:
    release air pollutants and greenhouse gases
  • advantages and disadvantages of nuclear energy
    advantages:
    clean source of energy
    requires less land to generate energy compared to other sources
    disadvantages:
    may be disastrous if not handled properly
  • what is chemical change?
    It is when a substance breaks down into two or more new substances or when two or more substances chemically combine to form one or more new substances