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