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# Friction

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### Friction

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