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lecture chapter 6 part 1 friction

# lecture chapter 6 part 1 friction - Force of Friction Use...

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1 Force of Friction: Use lower case f to represent it. Two types: Static friction (when object is at rest on a surface) Direction: Against “desired”, “possible” motion Kinetic friction ( when object is in motion on a surface ) Direction: Against actual motion At any given time, only has one of these two. Surface roughness: µ s , µ k coefficient of friction Static friction: A variable amount f s can be from 0 to µ s N to prevent slipping. f s always matches pulling force, but only up to the limit µ s N, f smax = µ s N is the point of setting object in to motion Kinetic friction: constant size f k = µ k .N (always) f s = F pull (always) Opposite direction vs. pull (always) f without vector hat, only mean the size of the force

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2 2. Up to some limit. F pull is too big for fs (static friction) to balance, When F pull > f s (max) = µ s N , object starts to move. The upper limit of f s(max) is determined by ------N (support force=press force) ------ µ s (surface roughness) 3. When it is moving, there is only kinetic friction: f k
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