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FORCES AND MOTION
Friction is a force of resistance that happens when one surface or object
touches another. When two rough surfaces rub against each other and are
difficult to move, like sandpaper dragging across uneven wood, there is a high
amount of friction. Low friction is when two smooth surfaces move easily
against each other, like when a melting ice cube slides across a counter top.
Sometimes high friction is helpful, and other times it is not. Likewise,
sometimes low friction is helpful and other times it is not.
Think about examples of high and low friction in the world around you. Alone
or with a partner, fill in this chart. We have filled in a couple of ideas to get
you started.
High Friction
Low Friction
Going down a slide at the park
Useful
Pushing a heavy chair
across the floor
Not
Useful
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