(b) Use the free-body diagram to write a correct equilibrium condition Figure for force components in the y-direction. (a) Use the free-body diagram to write a correct equilibrium condition Figure for force components in the x-direction. Set up the equations of equilibrium for the object. In the selection of the pivot, keep in mind that the pivot can be placed anywhere you wish, but the guiding principle is that the best choice will simplify as much as possible the calculation of the net torque along the rotation axis. On the free-body diagram, indicate the location of the pivot and the lever arms of acting forces-you will need this for correct computations of torques. (b) Choose the location of the rotation axis in other words, choose the pivot point with respect to which you will compute torques of acting forces. A minus sign (-) means that the actual direction is opposite to the assumed working direction. A plus sign (+) means that the working direction is the actual direction. For an unknown force, the direction must be assigned arbitrarily think of it as a ‘working direction’ or ‘suspected direction.’ The correct direction is determined by the sign that you obtain in the final solution. Label all forces-you will need this for correct computations of net forces in the x– and y-directions. As you do this for each force, cross out the original force so that you do not erroneously include the same force twice in equations. When suitable, represent the forces in terms of their components in the chosen reference frame. Draw a free-body diagram for the object, including only the forces that act on it. (a) Choose the xy-reference frame for the problem. Set up a free-body diagram for the object. In realistic problems, some key information may be implicit in the situation rather than provided explicitly. Identify the information given in the problem. Identify the questions you need to answer. Identify all forces acting on the object. For some systems in equilibrium, it may be necessary to consider more than one object. Problem-Solving Strategy: Static Equilibrium
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