1) slows down motion a) sliding b) energy c) friction 2) Present in objects with wheels  a) static friction b) rolling friction c) sliding friction 3) Present in objects with flat contact surface. a) static friction b) sliding friction c) rolling friction 4) Friction at rest a) Static friction b) Fluid c) sliding 5) Friction in liquids and gasses a) sliding b) static c) fluid

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