论文部分内容阅读
我们已经学习了动能和势能,知道动能和势能统称为机械能.那么机械运动中,机械能是如何转化的,我们如何判断机械能的变化,以及如何利用机械能呢?机械能的转化在动能和势能的转化过程中,若不考虑转化过程中的能量损失,则机械能的总量保持不变;在转化过程中若有能量损失(如克服阻力做功)或其他形式能的补充,则机械能的总量将发生变化.如,在做滚摆实验时,可以看到滚摆从高处旋转下降,越转越快,它的重力势能转化成了动能;到达最低点后,滚摆转而上升,它越转越慢,滚摆的动能
We have learned kinetic energy and potential energy and know that kinetic energy and potential energy are collectively referred to as mechanical energy. So how does mechanical energy transform in mechanical motion? How can we judge the change of mechanical energy and how to use mechanical energy? Transformation of mechanical energy In the transformation of kinetic energy and potential energy , The total amount of mechanical energy remains unchanged if energy losses in the conversion process are not taken into account; the total amount of mechanical energy will change if there is an energy loss (such as overcoming resistance work) or any other form of replenishment in the conversion process For example, when doing a roll experiment, it can be seen that the roll swing descends from a higher position, and the faster it turns, the more its gravitational potential energy is converted into kinetic energy. After reaching the lowest point, the roll turns to rise, Slow, roll kinetic energy