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FRICTION

FRICTION. Friction: Definition. Force that opposes the motion of an object Happens because most surfaces are not perfectly smooth. Example: If you slide a wooden block down a ramp it is slowed by friction. Friction makes motion possible Examples walking keeping a car on the road.

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FRICTION

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  1. FRICTION

  2. Friction: Definition • Force that opposes the motion of an object • Happens because most surfaces are not perfectly smooth. • Example: If you slide a wooden block down a ramp it is slowed by friction.

  3. Friction makes motion possible • Examples • walking • keeping a car on the road

  4. Friction also makes it hard to move objects • Example: a hockey puck on ice has less friction than a hockey puck on the road

  5. Sources of Friction: 1. Downward force As downward force increases, the friction increases

  6. Roughness of the surface The rougher the surface, the greater the friction

  7. Kinetic Friction • When two objects move over one another. “Moving Friction” • Example: Books being slid over the desk top

  8. Types Of Friction • Sliding Friction • the source of friction is one object sliding over another • ex. Sliding a book across a desk • SoftSLide

  9. Types of Friction • Rolling Friction • friction of one object rolling over another • ex. Wheels

  10. Types of Friction • Fluid Friction • Friction when one object goes through or over gases or liquids • ex. Boat through water, car through air • open up link in tab

  11. Static Friction • Caused when a force is applied to an object that does not cause it to move • Example: Book sitting on the desk

  12. Reducing friction - makes it easier to move objects • putting wax on skis • Putting oil on wheels or machine parts

  13. Increasing friction - makes it harder to move objects • adding weight (downward force) • Create a rougher surface

  14. Explain how friction is used in this sport • Friction of Curling

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