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