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动能定理既适用于可视为质点的物体,也适用于由质点构成的质点系;用动能定理解决质点系问题与解决质点问题有什么不同呢?一、F合=0,W合不一定为零例1一辆总质量为M的列车,在平直轨道上以V匀速行驶,突然后一节质量为m的车厢脱钩,假设列车受到的阻力与车重成正比,牵引力不变,则当后一节车厢刚好静止的瞬间,前面列车的速率为多大?解析以脱钩后前面列车和后面车厢为系统,设系统在水平方向所受的牵引力F,后面车厢受到的摩擦力为f1,前面列
Kinetic energy theorem applies not only to objects that can be considered as particles, but also to particles of particles formed by particles; What is the difference between solving kinetic energy theorem and particle problem? First, F is equal to 0, W is not necessarily Zero Example 1 A train with a total mass of M runs at a uniform velocity V on a straight track with a sudden mass m behind the car. If the train’s resistance is proportional to the weight of the vehicle and the tractive force remains constant, After a carriage just static moment, in front of the train speed? Analysis to decoupling the front of the train and the rear compartment for the system, set the system in the horizontal direction of traction F, the rear compartment by the friction force f1, the front column