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Friction

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