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动量定理,动量守恒定律;动能定理,机械能守恒定律是解决力学问题的两把钥匙;需要深刻理解、熟练掌握。但学生运用时又往往混杂不清,因此有必要安排小结课理顺脉络,下面是以对比法上好小结课的几点作法。 1 从对比中同中求异,分清标量、矢量 初速度大小相同的物体,若合外力作功相等,末动量相同吗?动量改变相同吗?
Theorem of momentum, the law of conservation of momentum, the theorem of kinetic energy, and the law of conservation of mechanical energy are the two keys to solve the problem of mechanics; they need to be deeply understood and mastered. However, when students use them, they are often confused. Therefore, it is necessary to make arrangements for the conclusion of the lesson, and the following points are based on the points of comparison. 1 From the same point in the comparison, we need to distinguish between objects with the same magnitude of scalar and vector initial velocity. If the external force is equal to work, is the end momentum the same? Does the momentum change the same?