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: SCUOLI Name: Section Day: M T WR Section Time: 2 PM SPM Answer the following questions. (Assume g -9.80 m/s.) 1. Suppose a block of mass 25.0 kg rests on a horizontal plane, and the coefficient of static frictior between the surfaces is 0.220. What is the maximum possible static frictional force that could act on the block? 2. What is the actual static frictional force that acts on the block if an external force of 25.0 N acts hori- zontally on the block? 3. A 5.00 kg block rests on a horizontal plane. A force of 10.0 N applied horizontally causes the block to move horizontally at constant velocity. What is the coeflicient of kinetic friction between the block and the plane? 4. For either type of coefficient of friction, what is generally assumed about the dependence of the value of the coefficient on the area of contact between the iwo surfaces? 5. Suppose a block of mass Mlies on a plane inclined at an angle 0. Let be the maximum angle at which the mass can remain static on the plane. Let , be the angle at which the block slides down the incline at constant speed. Show that the coefficient of static friction is tane, and that the coefficient of kinetic friction is, -tan (Provide a force diagram.)

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