What is friction? Edit

Friction is a force, affects motion. Friction acts on materials in contact with another, or acts in different direction in opposite motion.

What does the force of friction depend on? Edit

  • Kinds of materials in contact
  • How much surfaces pressed together

..such as Rubber vs. Concrete, and not Steel vs. Steel (Rubber vs. Concrete > Steel vs. Steel)

Static Friction Edit
  • Opposes movement of stationary object
  • Moving furniture
  • Hardest part getting moving
Kinetic Friction Edit
  • Acts on objects in motion
  • Once object begins moving, less force to keep in motion
  • Sliding, Rolling, Fluid
Sliding Friction Edit
File:Ray Lee basketball player class of 2012 Romulus High school.jpg
  • Two objects slide past one another
  • Basketball shoes prevent slipping
Rolling Friction Edit
  • Objects such as wheel or ball rolls across surface
  • Easier to overcome than sliding friction
Fluid Friction Edit
File:Boy with helmet on training wheels.jpg
  • Solid objects move through fluids
  • Cyclists use aerodynamic and spandex to reduce friction
Air Resistance Edit
  • Friction acting on something moving through air
  • Don't notice unless at high speed.
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