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Friction usually ________ moving objects.
speeds up
slows down
destroys
_______ surfaces have a lot of friction
rough
smooth
all
The action that makes that surface of an object disappear is _______
wore off
wear away
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 ____
rup
rud
rub
How does lubrication work?
The oil fills bumps and hollows to make a smoother surface
The oil stops the surfaces from wearing away
The oil reduces the heat created by friction
Which action creates the MOST friction?
rolling
lubricating
sliding
If we have no friction moving objects have no ______.
grip
gravity
generator
When is friction a good thing?
Skiing on the snow
Pushing a shopping trolley
Running a race
