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Chapter 5.2 Friction at the Sochi Winter Olympics
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Friction friction is the force that opposes motion.
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Causes of friction Surfaces have tiny hills and valleys on both sides. As the surfaces slide across each other the hills and valleys grind against each other.
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Causes of friction Friction depends on both surfaces. http://news.discovery.com/adventure/videos/science-friction-all-about-the-physics-of-curling-video.htm
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Types of Friction Static friction - friction force that resists motion between surfaces that are not moving.
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Types of Friction Sliding friction - the friction force that resists the motion of an object moving across a surface.
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Types of Friction rolling friction - opposes motion of a rolling object.
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Types of Friction air friction - a force of the surrounding fluid (air) working against motion
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Types of Friction
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Motion through water - viscous friction works much like air friction.
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Effect of weight on friction Adding weight to a sliding or rolling object adds friction between the two surfaces. Which takes more force to push?
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Decreasing Friction 1. Lubrication - such as oil 2. ballbearings 3. Magnetic Levitation
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Increasing Friction 1. cleats
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Increasing Friction 2. Race tires vs Street Tires - Street Tires increased friction in wet conditions. - Race tires increased friction on dry roads.
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