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### FRICTION.pptx

• 2. Forces: Friction Friction is a force that opposes motion between two surfaces.
• 3. Forces: Friction Friction occurs because the surface of any object is rough. Even surfaces that feel smooth are covered with microscopic hills and valleys.
• 4. Forces: Friction When two surfaces are in contact, the hills and valleys of one surface stick to the hills and valleys of the other surface.
• 5. Friction Factors The amount of friction depends on these 2 factors: 1. Roughness of the surfaces/texture 2. The force pushing the surfaces together.
• 6. Will the tube roll less over a smoother surface or a rougher surface? Why? Smooth Surface Rough Surface The rougher surface because there are more hills and valleys and the valleys are deeper.
• 7. Which has more friction and why? 100 pounds The 100 pound box because the force pushing together is higher so the hills and valleys are in closer contact. 40 pounds
• 8. Friction Factors 1. Roughness – The rougher the surface, the more hills and valleys there are and the greater the friction. 2. Force pushing together/weight – Force is increased, the hills and valleys will be in closer contact and friction will increase.
• 9. Amount of Surface Area in fluids • The amount of surface area affects the friction between objects in liquids and gases. Example: Swimming
• 10. Types of Friction 1. Sliding 2. Fluid 3. Rolling 4. Static
• 11. Sliding Friction • Sliding friction is a friction force that opposes the direction of motion of an object that occurs when solid surfaces slide over one another. • Examples: • Writing – pencil point and paper • Combing your hair – surface of comb and strands of hair
• 12. Fluid Friction • The force that tries to slow objects down when they move through a liquid or a gas. It's also known as "drag", or "air resistance". • All gases and liquids are fluids. • Fluid Friction increases as the speed of the object increases. • An airplane and a swimmer both experience fluid friction.
• 13. Rolling Friction • Rolling friction is friction that occurs between surfaces in motion that are rolling in which one of the surfaces is a wheel, roller, or ball. • Examples: • Riding a bike – tires and ground • Bowling – ball and lane
• 14. Static Friction • Static friction is friction that occurs when the surfaces in contact are at rest (not in motion). • Examples: • A book resting on a desk. • A potted plant sitting on a sidewalk.
• 15. Ways to Reduce Friction • Smooth the surface – less hills and valleys and not as deep. • Replace sliding with rolling (Use Wheels) • Add a lubricant like oil, wax, or grease – Fills in the hills and valleys. • Less force pushing together – The hills and valleys are not pushed together as hard so they have less contact.
• 16. Ways to Increase Friction • Rough the surface – more hills and valleys • Replace rolling with sliding • More force pushing together – The hills and valleys are pushed together harder so the hills and valleys are in closer contact.
• 17. Friction Song •What is friction? •Friction Video
• 18. Glass Forces: Friction Surfaces that may cause more friction. Sandpaper Carpet Gravel ICE Tile Surfaces that may cause less friction
• 19. Forces: Friction Friction is both harmful and helpful.
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