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动能定理是物理学中的一条重要定理,它不仅在力学中有广泛应用,还可以渗透到电学、热学、光学之中。但有相当一部分同学由于对动能定理的理解不深,造成使用不当或出现错解现象。动能定理中的合外力做功所涉及的位移和动能变化量中所涉及的速度都应相对同一惯性参照系,通常取地面为参照系。同学往往忽视这一点而导致错解。
The kinetic energy theorem is an important theorem in physics. It not only has a wide range of applications in mechanics, but also penetrates into electricity, thermals, and optics. However, a considerable number of students did not understand the kinetic energy theorem deeply, resulting in improper use or misunderstanding. In the kinetic energy theorem, the displacement and kinetic energy involved in the external force work involved in the work should all be relative to the same inertial frame of reference. Usually, the ground is taken as the reference frame. Classmates often overlook this and lead to misunderstandings.