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