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===Experiments===
Good shoes are designed to have a high '''friction''' surface on the sole. Take off one of your shoes and look at the bottom of your show with a [[Magnifying Glass|magnifying glass]].
You might try to answer the following questions:: Who has the slipperiest shoes and how do slippery shoes look different from shoes that are not slippery? : When shoes get older, how does the bottom of the shoes look different and do shoes get more slippery or less slippery as they get old?
'''Friction of different surfaces'''
: 1. Take a flat piece of wood and attach spring to one end.
: 2. Pull the piece of wood by the spring along the carpet and measure how long the spring is as you drag it.
: 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.