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: The smoother a surface is, the less '''friction''' an object will experience.
: A surface could be described as high '''friction''' or low '''friction'''.
: Some times a low '''friction''' surface is called "slippery".
===Experiments===
*Shoes
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.