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: 3. Repeat this by dragging it along a table and the tarmac outside.
: 4. Write down which surface made the spring go longest. That is the surface with most friction.
==Key Stage 3==
===Meaning===
'''Friction''' is a [[force]] that acts to slow an [[object]] down when two [[solid]] surfaces are in contact.
===About Friction===
: [[Friction]] is a [[Contact Force|contact force]].