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物体由于运动而具有的能力 叫做动能 这个很好理解吧
势能是物体在高处具有能量意思是由于有重力的存在 因为物体会受到重力使他有个向下的运动趋势 试想如果你用手抓住一个球然后轻轻放掉 它肯定会下落吧? 但是放的时候你并没有给它初始的动能 那他越来越快的速度哪里来的呢? 当然就是势能了 球的初始位置越高 到地上的速度就越快吧 所以高度越高 势能就越大的 而且你要记住势能是个相对值哈 要看你以什么为参考面来觉得(上面说的重力势能 当然弹性势能也一样 只不过考虑物体收到力不是重力了 而是弹簧的弹力了)
螺旋桨转动当然是动能了 因为它在动嘛 呵呵
另外动能和势能统称为机械能
动能肯定物体要有运动 而势能则跟物体是否运动无关 也就不存在静止不静止
动能是因为物体在运动中所具有的能量
势能是因为物体所在的位置所具有的能量,包括了重力势能和弹性势能
螺旋桨转动,是东西在旋转,螺旋桨的外部在运动中,所以具有的是动能啊。。
参考资料:团队 我最爱数学
动能是因为物体在运动中所具有的能量
势能是因为物体所在的位置所具有的能量,包括了重力势能和弹性势能
并不是说某个物体只有动能或势能 比如 飞行中的飞机具有动能,和势能
螺旋桨转动,是东西在旋转,螺旋桨的外部在运动中,所以具有的是动能啊。
研究势能时必须设定参考值,比如说地面处的势能为0,这样才能算其他物体的势能。
动能是物体因为运动而且有的能量,比如子弹,因为高速运动,且有强大破坏力,是因为有动能,而重里势能是一种相对而言的,比如高处的物体当你选的“地面”不同,重力势能势能也不同
在地面上的球,膨胀后重心是升高的,而悬挂的球膨胀后,重心是下降的,所以地面上的球后来的重心高,重力势能较大
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