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  • 1. S: Friction and Gravity
  • 2. Friction 4-11-08
  • 3. Objectives:
    • Define force, friction and lubricant
    • Name and describe and describe the four types of frictional force
  • 4. Aristotle‚Äôs belief Constant force had to be applied in order for objects to stay in motion
  • 5. Galileo
    • Concluded all objects have a tendency to resist changes in motion.
    • Objects with more mass are more difficult to change their motion
    • Suggested friction was the only thing to that kept moving objects from staying in motion.
  • 6. Friction
    • a force that opposes motion
  • 7.
    • Friction is the force that results when two surfaces rub together.
  • 8.
    • Moving objects slow down because friction acts in a direction opposite to the motion of the object.
  • 9. Four Types of Frictional Force:
    • Static
    • Sliding
    • Rolling
    • Fluid
  • 10. Static Friction
    • the force which keeps a motionless object from being pushed or pulled across a surface.
  • 11. Sliding Friction
    • When two solid surfaces slide over each other, sliding friction acts between the surfaces.
  • 12.
    • the weight of the object that is moving
    • the type of surfaces that the object slides across
  • 13. Rolling Friction
    • When an object rolls over a surface, the friction produced is called rolling friction.
  • 14.
    • Rolling friction opposes motion less than sliding friction, so wheels are placed on objects to make them easier to move.
  • 15. Fluid Friction
    • When an object moves through a fluid, fluid friction results.
  • 16.
    • Air resistance is a common example of fluid friction .
    Liquids & gases are fluids.
  • 17.
    • Fluid friction usually opposes motion less than sliding motion.
  • 18. Lubricants
    • Oil
    • Grease
    • Wax
    change sliding friction to fluid friction. Examples of lubricants:
  • 19. Helpful Friction