# lecture16 - Statics Examples(Serway 12.1-12.3 Practice...

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1 Physics 1D03 Statics (Serway 12.1-12.3) • Examples Practice Problems: Chapter 12, problems 9, 11, 19, 21, 41, 45 Physics 1D03 Example: w 2 φ = 30 ° A B C 5 / 6 L 1 / 6 L Steps: 1) Free-body diagram for the beam. The forces will be the weights w 1 and w 2 , and the forces from the supports at A and C . 2) Net force = 0 (2 equations), net torque =0 (1 equation). 3) Solve for up to 3 unknowns. uniform beam AC: weight w 1 = 100 N length L = 3.00 m hinge at A, cable from B to C w 2 = 200 N Find: tension in BC , force at A .

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2 Physics 1D03 Note the force P from the wall. The hinge at A prevents translational motion in any direction, so it may exert a force P in any direction. The unknowns are: tension T , force | P | , and angle θ ; or , T , P x and P y . θ 30 ° P T w 2 w 1 Forces on beam: A P x P y C Physics 1D03 Quiz How can you generate equations for P x and P y which don’t involve the tension T? θ
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lecture16 - Statics Examples(Serway 12.1-12.3 Practice...

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