Friction

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Friction
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Sources of Friction

• Edges of materials are always rough
• Rougher edges more friction

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Types of Friction

• Static friction friction of a stationary object
  that opposes movement
• Sliding friction friction of an object sliding

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Types of Friction

• Rolling friction friction of an object rolling
• Fluid friction friction that opposes the motion
  of objects moving through a fluid

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• Friction can be helpful or harmful.