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共点力作用下物体的动态平衡问题是力学中的一类典型问题,用常规方法求解这类问题, 过程复杂,结果容易出错,若运用图像法求解此类问题,则能优化解题思维,简化解题过程,提高解题的准确度,请看下面的实例。例1 如图1,物体的质量为m,若保持θ不变,将水平绳OB的B端逐渐上移,则绳OB 的拉力将() (A) 逐渐减少(B) 逐渐增大
The problem of dynamic balance of objects under the action of common point forces is a typical problem in mechanics. Solving such problems by conventional methods has a complicated process and results in errors. If image problems are used to solve such problems, problem solving can be optimized. Simplify the problem solving process and improve the accuracy of problem solving. Please see the following examples. Example 1 As shown in Fig. 1, the mass of the object is m. If the constant θ is maintained and the B-end of the horizontal rope OB is gradually moved upward, the tension of the rope OB will gradually decrease () (A) and gradually increase (B).