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动量动能机械能守恒是高中考中的重要内容,也是考生经常出错的地方,下面以几个问题为例,希望对同学们有帮助.例1质量为M的汽车带着质量为m的拖车在平直公路上以加速度a匀加速前进,当速度为v0时拖车突然与汽车脱钩,到拖车停下瞬间司机才发现.若汽车的牵引力一直未变,车与路面的动摩擦因数为μ,那么拖车刚停下时,汽车的瞬时速度是多大?图1解析以汽车和拖车系统为研究对象,全过程系统受的
Momentum momentum conservation of mechanical energy is an important part of high school entrance examination, but also candidates where often mistakes, the following to a few questions, for example, I hope to help students.Example 1 mass M car with a mass m trailer in the flat When the speed is v0, the trailer suddenly decouples from the car and the driver just noticed until the trailer is stopped.If the traction force of the car has not changed and the dynamic friction coefficient between the car and the road is μ, Stopped, the instantaneous speed of the car is how much? Figure 1 Analysis of the car and trailer system for the study, the whole process of system by