# Quiz 5 - M= X*Fy – Y*Fx Show units C(5 points Find the...

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QUIZ # 5 Class 7 September 20 2007 Name _______________________________________ Team__________ Problem 1. (15 points) Show all work. ( The size of the grid square is 1cm x 1cm.) A) (5 points) For the object above, find the moment of the 5 N force around the point O. Use definition of the moment: The magnitude of the turning action about a point = perpendicular distance from pivot (point O) to the line of action of the force times the magnitude of the force. Show units! B) (5 points) For the object above, find the moment of the 10 N force around the point O. Use formula:
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Unformatted text preview: M= X*Fy – Y*Fx. Show units! C) (5 points) Find the net moment (sum of the moments of all three forces). Show units! Problem 2. (5 points) Show all work. Consider the truss. External force P is applied at point D. A) (5 points) Draw the free body diagram for the truss. Problem 3. (5 points) Show all work. What angle (marked as θ) does the resultant force of F 1 and F 2 make with the x-axis? Hints: 1) Express F 2 in terms of unit vectors i and j . 2) Find the resultant force vector in terms of unit vectors i and j. Now you can easily find the angle....
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