![]() ![]() In translational dynamics, a body is represented as its CM, where all forces on the body are attached and no torques appear. Also note that a free-body diagram for an extended rigid body that may undergo rotational motion is different from a free-body diagram for a body that experiences only translational motion (as you saw in the chapters on Newton’s laws of motion). Without the correct setup and a correct diagram, you will not be able to write down correct conditions for equilibrium. Note that setting up a free-body diagram for a rigid-body equilibrium problem is the most important component in the solution process. Also, you may independently check for your numerical answers by shifting the pivot to a different location and solving the problem again, which is what we did in Example 12.1. If they do not, then use the previous steps to track back a mistake to its origin and correct it. Your final answers should have correct numerical values and correct physical units. ![]() Evaluate the expressions for the unknown quantities that you obtained in your solution. ![]() If the number of unknowns is larger than the number of equations, the problem cannot be solved. Keep in mind that the number of equations must be the same as the number of unknowns. At this point, your work involves algebra only.
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