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“用能量的观点和方法处理问题”是中学物理教学的重中之重。高一物理第七章《机械能》中主要涉及以下几种能量:动能、重力势能、弹性势能,三者又统称为机械能。那么如何通过能量角度来分析解决力学问题呢?必须先理解这几种能量变化的原因。一、动能的变化动能是物体由于运动而具有的能量。动能变化与合外力做功有关,外力对物体做的总功等于物体动能的变化,即W_总=△E_K=E_(K2)-E_(K1)。实际应用时,不必求合力,特别是在全过程的各个阶段受力有变化的情况下,只要把各个力在各个阶段所做的功都按照代数和加起
“Use of energy point of view and methods to deal with problems ” is the top priority of physics teaching in high school. The physics of the seventh chapter “mechanical energy” mainly involves the following kinds of energy: kinetic energy, gravitational potential energy, elastic potential energy, the three are collectively referred to as mechanical energy. So how to analyze and solve the problem of mechanics from the perspective of energy? You must first understand the reasons for these kinds of energy changes. First, the kinetic energy changes kinetic energy is the object has the energy. The change of kinetic energy is related to the work done by the external force. The total work done by the external force on the object is equal to the change of the kinetic energy of the object, that is, W_total = ΔE_K = E_ (K2) -E_ (K1). In actual application, it is not necessary to work together, especially under the circumstances that the force undergoes changes in all stages of the whole process, as long as the work done by each force at each stage is performed algebraically and additively