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# Friction

## by tams on Apr 10, 2008

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## FrictionPresentation Transcript

• S: Friction and Gravity
• Friction 4-11-08
• Objectives:
• Define force, friction and lubricant
• Name and describe and describe the four types of frictional force
• Aristotle’s belief Constant force had to be applied in order for objects to stay in motion
• 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.
• Friction
• a force that opposes motion
• Friction is the force that results when two surfaces rub together.
• Moving objects slow down because friction acts in a direction opposite to the motion of the object.
• Four Types of Frictional Force:
• Static
• Sliding
• Rolling
• Fluid
• Static Friction
• the force which keeps a motionless object from being pushed or pulled across a surface.
• Sliding Friction
• When two solid surfaces slide over each other, sliding friction acts between the surfaces.
• the weight of the object that is moving
• the type of surfaces that the object slides across
• Rolling Friction
• When an object rolls over a surface, the friction produced is called rolling friction.
• Rolling friction opposes motion less than sliding friction, so wheels are placed on objects to make them easier to move.
• Fluid Friction
• When an object moves through a fluid, fluid friction results.
• Air resistance is a common example of fluid friction .
Liquids & gases are fluids.
• Fluid friction usually opposes motion less than sliding motion.
• Lubricants
• Oil
• Grease
• Wax
change sliding friction to fluid friction. Examples of lubricants: