机械能守恒定律ppt是定律还是定理？

来源：蜘蛛抓取(WebSpider) 时间：2018-05-13 20:25 标签： 机械能守恒定理
机械能守恒定律是怎么得出来的，求推导过程_百度知道
机械能守恒定律是怎么得出来的，求推导过程
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质量为m的小球，从距地面h1处以速度v1下落，到达距地面高度h2处，速度v2(忽略空气阻力）由WG=mg(h1-h2)由动能定理得WG=1/2mv2^2-1/2mv1^2mgh1-mgh2=1/2mv2^2-1/2mv1^2mgh2+1/2mv1^2=mgh1+1/2mv1^2Ep2+Ek2=Ep1+Ek1E2=E1
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