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Friction

Friction. Friction Notes. Force that resists change in motion Symbol: F ric or F f Coefficient of Friction symbol: µ = F ric / F N no units. Types:. Static Friction: Friction btwn . stationary surfaces Kinetic Friction: Friction btwn . moving surfaces. Friction Facts.

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Friction

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  1. Friction

  2. Friction Notes • Force that resists change in motion • Symbol: Fric or Ff • Coefficient of Friction • symbol: µ = Fric/ FN • no units

  3. Types: • Static Friction: Friction btwn. stationary surfaces • Kinetic Friction: Friction btwn. moving surfaces

  4. Friction Facts • Acts in the opposite direction of the moving object • Parallel to the surface of contact • Caused by electrostatic force btwn. outer electrons of materials • Static ≥ kinetic • Dependent on kinds of materials used • Independent of surface area and speed

  5. Equation • Fric = µFN • can only use this equation if FN is perpendicular to the surface

  6. Drag and Terminal Velocity • Drag (air resistance) = friction of objects that move through the air • Terminal velocity = constant velocity achieved when friction is balanced by Fg

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