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Friction

Friction. Is a force opposing the motion of one surface over another. Friction is Everywhere!!!. walking. tires. brakes. sand on icy streets. Cause of Friction. Friction Force vs. Weight.

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Friction

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  1. Friction Is a force opposing the motion of one surface over another.

  2. Friction is Everywhere!!! walking tires brakes sand on icy streets

  3. Cause of Friction Friction Force vs. Weight Friction is caused by the microscopic roughness between surfaces…like two gears locking together. Ff W

  4. Basically it is what slows things down… but that’s not all! Friction can also cause heat!

  5. Factors that affect the size & force of the Friction: • The roughness of the surface. • The amount of force pushing the surfaces together. Try it with your hands!

  6. Which would have greater friction force… sand paper or a waxed floor? Why?

  7. 4 Types of Friction 1. Sliding Friction – acting between two surfaces where one is moving.

  8. Can you think of more examples Of SLIDING friction? Pushing your binder to the middle of your desk Ice skating Wiping off a counter

  9. 2. Rolling Friction – acts between two surfaces of objects where one has a rounded shape.

  10. Can you think of more examples Of ROLLING friction? Riding your bike Roller skating Moving something with a dolly

  11. 3. Fluid Friction – opposes the motion of objects traveling through liquids or gases. Liquids lubricants

  12. Gases Hammer Feather

  13. Can you think of more examples Of Fluid friction? Slipping on a wet floor Holding your hand out of the window of a moving car Putting lotion on your hands

  14. 4. Static Friction – When object is at rest, the frictional force is equal to the applied force. This static friction acts between two stationary (still) bodies . The friction is static as there is no motion. In this case, static means STILL, not moving!

  15. There are several ways we can reduce The amount of friction between objects Reducing the force pushing both surfaces together Lubricants such as oil Polish the surfaces to make them smoother Switch from sliding friction to rolling friction

  16. It is the force of friction that opposes an object moving. Many people think that it is a nuisance because it has causes us to apply a greater force to move an object. But in fact, it is of great help to us.

  17. If there is no friction, then cars cannot move on the road, we would have to hold things with both hands, and we can hardly even walk.

  18. What if we didn’t want friction? Sometimes we want to reduce the amount of friction and go fast!

  19. Think about when you have been ice skating or the sidewalk was frozen over. Is it very hard to walk on ice? • How ‘bout those penguins?

  20. Watch this and think about why this myth is true. Be ready to discuss.

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