Friday, August 23, 2019
Friction
When two surfaces slide against each other, a force called friction makes them stick very slightly together. Smooth surfaces, like ice and glass, are easy to slide over. They create very little friction. Rough surfaces like rock and sand create much more friction, and are easy to grip on to. It is harder to move things when there is a lot of friction holding them back, but if there were no friction at all, people would slip and slide around whenever they took a step
Tuesday, August 6, 2019
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