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Physics_1112_Spring_2009__Co_op_5

Physics_1112_Spring_2009__Co_op_5 - P axis(e A 150-N brick...

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Name:__________________ Partners:______________________________ Physics 1112, Spring 2009 Cooperative Problems, Week 5 1. [based on Y&F 5.28] In a laboratory experiment on friction, a 300-N block resting on a horizontal table is pulled by a horizontal wire. The pull P gradually increases until the block begins to move and continues to increase thereafter. The figure shows a graph of the friction force f on this block as a function of the pull. (a) On the graph, identify where the friction is static and where it is kinetic. (b) Find the coefficients of static and kinetic friction between the block and the table. (c) Why does the graph slant upward in the first part but then level out? (d) Draw a graph showing the acceleration a x of the block as a function of P . (Use g 10 m/s 2 .) Label axes with numerical values of importance. ( E.g. in the f vs P graph above, you’d label 50 and 75 N on the f axis and 75 N on the

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Unformatted text preview: P axis.) (e) A 150-N brick is fastened to the top of the block and the experiment is repeated. Draw the graph of f vs P for this case. Label axes with numerical values as in (d). 2. A wedge with mass M rests on a horizontal tabletop. A block with mass m is placed on the wedge and a constant horizontal force F is applied to the wedge. Both the wedge-tabletop surface and the wedge-block surfaces are frictionless. (a) Draw FBDs for the block, for the wedge, and for the system block+wedge. F m α M (b) What must the magnitude of F be if the block is to remain at a constant height above the tabletop? Express your answer in terms of M, m, α , and g. (c) Optional challenge: Describe how your answer to (b) would change if there were friction at the wedge-tabletop surface, at the wedge-block surface, or both. In each case, is there a unique value of F for the block to remain at constant height?...
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Physics_1112_Spring_2009__Co_op_5 - P axis(e A 150-N brick...

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