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能量守恒定律是中学物理中的重要内容．在分析物理问题时,若系统能量守恒,则只需抓住系统在某一过程中的始末状态的能量相等来列式求解．用此方法解决问题简单、易懂．但是很多学生经常把光滑无摩擦、不计空气阻力、不计内阻等看做能量守恒的条件,一见题中有此类条件就冒然应用能量守恒去解题,不去分析物理过程,忽视了题目中隐含的细节——能量损失,造成错解．
The law of conservation of energy is an important part of middle school physics. When analyzing the physics problem, if the system energy is conserved, it is only necessary to hold the energy of the system in a certain process equal to the solution of the equation. Using this method to solve the problem is simple and easy to understand. However, many students often regard smoothness, frictionlessness, air resistance, and internal resistance as conditions for conservation of energy. If such conditions are found in the first question, they will use energy conservation to solve the problem and not analyze the physical process. Implicit detail in the title - energy loss, causing misunderstandings.