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Friction

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  • Friction usually ________ moving objects.
    slows down
    destroys
    speeds up
  • When is friction a good thing?
    Pushing a shopping trolley
    Skiing on the snow
    Running a race
  • How does lubrication work?
    The oil stops the surfaces from wearing away
    The oil fills bumps and hollows to make a smoother surface
    The oil reduces the heat created by friction
  • _______ surfaces have a lot of friction
    all
    smooth
    rough
  • What is NOT an example of an object that gets damaged over time by friction?
    knife
    car tyres
    oil (lubrication)
  • To move two surfaces together quickly (like our hands) is called ____
    rud
    rub
    rup
  • Which action creates the MOST friction?
    lubricating
    sliding
    rolling
  • The action that makes that surface of an object disappear is _______
    wear out
    wore off
    wear away
  • If we have no friction moving objects have no ______.
    gravity
    generator
    grip
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