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# HW6-7 - Oregon State University Physics 201 Fall Fall Term...

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Page 1 Oregon State University Physics 201 Fall Term, l 2009 HW6-7 This HW assignment, W due November 16, covers topics in Chapters o 4-8 (through section 8.2) of the text— freely mixed together (and you may need the basics of momentum and kinematics, too). Donʼt forget the extra credit point that is available. For each situation—either HW problem or exercise—use the provided page to make a full free-body dia- gram analysis and apply Newtonʼs Laws. Then , for each HW problem, follow the recommended format for solutions, using SI units unless directed otherwise and 3 significant digits in all numerical answers. Do not try to solve the equations and find solutions only on the same page as the FBD analysis—take plenty of paper/space—whatever you need—to do your algebra, showing all steps! Unless indicated otherwise, assume the magnitude of local gravitational acceleration is that of Earthʼs: g = 9.80 m/s 2 . There are 16 actual HW problems. Most problems have space provided for Free-Body Diagrams (FBD) analysis, just as you have done in Lab 6—use that space fully and as intended. HW problems 1-3 con- tain situations similar to those you have already analyzed in Lab 4. Problems 7 and 8 pertain to gravi- tational force and donʼt need much diagramming (but draw a general picture if you need to). The others pertain to rotational dynamics; or some are combination problems—some with numbers, at least one without (a “no-solve” problem). Problems 4-7 each contain some element of circular motion, which you have not yet practiced with the exercise format of Lab 6. So, at least for problems 4-6, there are some other FBD exercises that precede each problem. Do the correspondingly numbered FBD exercises before those problems (i.e. in the order presented). Note that, as usual, when you do the FBD exercises, you donʼt need to solve the equations you develop—just diagram fully and set up the equations. (You do need to get full solutions for the HW problems themselves.) For this assignment, two HW problems will be graded, but they will not receive full credit unless the correspondingly numbered FBD exercises preceding them (if any) are also completed.

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Page 2 x-analysis—situation (a) y-analysis—situation (a) FBD of m coord. axes m F T1 θ 1 HW PROBLEM 1: The block ( m = 30 kg) is on a level surface with friction coefficients μ s = 0.750 and μ k = 0.500. If F T1 = 100 N, θ 1 = 40.0°, and θ 2 = 25.0°, find F T2 so that: (a) the block is still at rest but “just about” to start sliding to the right. (b) the block slides to the right at constant velocity. F T2 θ 2 x-analysis—situation (b) y-analysis—situation (b)
Page 3 x-analysis y-analysis FBD of m coord. axes HW PROBLEM 2: A 90-kg man boards an elevator and stands on an accurate bathroom scale (which just happens to be there).

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