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动量守恒定律的应用是高考的重点和热点,在处理动量守恒中碰撞的问题时,建立动量守恒关系往往不是难点。学生感觉比较困难的是讨论碰撞过程中能量转化和在碰撞过程中的速度关系,例如质量为m1的粒子1以速度v0正碰静止的质量为m2的粒子2,试讨论碰后粒子2的速度v2的可能取值范围。对这一问题,有的学生甚至已经套关系式解得结果,但仍存有疑惑,关键是不清楚作用过程。本文就上述问题建立一个模型,帮助学生理解和分析这类问题。
The application of the law of conservation of momentum is the focus and hot spot of the college entrance examination. When dealing with the collision problem of conservation of momentum, it is often not difficult to establish momentum conservation relations. The students feel more difficult to discuss the relationship between energy conversion and collision speed in the process of collision. For example, particle 1 with mass m1 collides with particle m2 with mass m2 at velocity v0 and collides with it. Discuss the velocity of particle 2 after collision. Possible range of v2. On this issue, some students have even solved the results of the relationship equation, but they still have doubts. The key is not to understand the process of action. This article establishes a model for the above issues to help students understand and analyze such issues.