10_1425_web_Lec_08_Friction

10_1425_web_Lec_08_Friction - Friction Physics 1425 Lecture...

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Friction Physics 1425 Lecture 8 Michael Fowler, UVa.
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Warm Up Question A brass cube and a flat brass disk of the same weight are on a flat board. The board is gradually tilted until sliding begins. Which slides first? A. The brass cube B. The flat brass disk C. Both at the same time
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Free Body Diagram for Block on Slope At maximum pre-slide angle : Note frictional force is parallel to surface . Forces on block must add to zero as vectors since it is at rest. Notice: θ mg N mg N fr F fr F fr tan FN =
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Coefficient of Static Friction The magnitude of the maximum static frictional force (just before sliding) is found to be directly proportional to the normal force : is called the coefficient of static friction . If is the tilt angle where sliding begins, ( ) fr max S FN µ = S fr tan S µθ = fr θ
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How Steep a Hill Can a Car Climb? Assuming a powerful engine, the incline is limited by the coefficient of static friction . The friction force from the road will push the car up the hill , provided: Bottom line:
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10_1425_web_Lec_08_Friction - Friction Physics 1425 Lecture...

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