1 / 16

FRICTION!!!

FRICTION!!!. Friction = a force that opposes motion between two surfaces that are moving. Friction occurs because the surface of any object is rough . All surfaces consist of microscopic “hills” and “valleys.” When two surfaces are in contact, these hills and valleys interlock .

vinnie
Download Presentation

FRICTION!!!

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. FRICTION!!!

  2. Friction = a force that opposes motion between two surfaces that are moving.

  3. Friction occurs because the surface of any object is rough. • All surfaces consist of microscopic “hills” and “valleys.” • When two surfaces are in contact, these hills and valleys interlock.

  4. Two variables that determine the amount of friction between two surfaces: • The roughness of the surfaces. • The force pushing the surfaces together.

  5. Two Rules to Remember: • Rougher surfaces create more friction. (Smooth = less friction) • Greater force creates more friction. (Less force = less friction)

  6. Rougher surfaces create more friction. (Smooth = less friction)

  7. Greater force creates more friction. (Less force = less friction)

  8. 4 Types of Friction: • Sliding Friction • Rolling Friction • Fluid Friction • Static Friction

  9. Sliding Friction • Occurs when one object slides across another object. • Sliding friction opposes movement; it acts in the opposite direction of the moving object.

  10. Rolling Friction • Occurs as a wheel or bearing rolls across a surface. • Rolling friction is usually less than the force of sliding friction. • What type of friction occurred between the axle and bearing of your mousetrap car?

  11. Fluid Friction • Fluid friction occurs as an object is traveling through a fluid. • A fluid is a liquid or gas. • In most cases, fluid friction is less than sliding friction.

  12. Static Friction • Static friction is the force that prevents an object from moving. • It balances the applied force trying to move it. • Static friction disappears once the object starts moving.

  13. Friction can help or hurt. • Helpful: • Traction between wheels and road. • When trying to open a soda bottle. • When walking! • Harmful: • Friction converts KE into heat; heat breaks down parts and reduces the efficiency of machines.

  14. How to reduce friction: • Lubricants • Make rough surfaces smoother.

  15. How can you increase friction? • Make surfaces rougher. • Increase the force pushing the surfaces together.

More Related