045四种类型的验证机械能守恒定律实验设计及数据处理 精讲精练-2022届高三物理一轮复习疑难突破微专题
045四种类型的验证机械能守恒定律实验设计及数据处理一.必备知识精讲(一)常规实验原理与操作1.实验目的: 验证机械能守恒定律。2.实验原理(1)在只有重力做功的自由落体运动中,物体的重力势能和动能互相转化,但总的机械能保持不变。若物体某时刻瞬时速度为v,下落高度为h,则重力势能的减少量为mgh,动能的增加量为mv2,看它们在实验误差允许的范围内是否相等,若相等则验证了机械能守恒定律。(2)速度的测量:做匀变速直线运动的物体某段位移中间时刻的瞬时速度等于这段位移的平均速度。计算打第n点速度的方法:测出第n点与相邻前后点间的距离xn和xn+1,由公式vn=计算,或测出第n-1点和第n+1点与起始...
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