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Static Equilibrium - Physics

SE-1 3/26/2009 University of Colorado at Boulder Static Equilibrium An object is in Static Equilibrium (it is not moving) IF 1) it is not translating (not moving up, down, left, or right) AND 2) it is not rotating (not spinning CW or CCW) (We are talking about motion in a 2D plane here.) If a stationary mass is acted on by several forces 123F , F , F ,.. , then in order to NOT translate, the net force must be zero. nettotal123 FFFFFF0 1x2x3x1y2y3yFFF0 , FFF0 xyF0 ,F0 Equilibrium possible, but not guaranteed. Even though the net force is zero, the object might not be in Static Equilibrium .

Then the tension force does not produce any torque (since the lever arm is zero), and the (unknown) variable T does not appear in our torque equation. 0 S B wy LL m g m g LF 0 42 (L's cancel) S B wy mg mg F 42 (Still have to get F wx using method I above.) What is the magnitude of the total force on the bar from the wall? 22

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