2020版高考物理一轮复习第二章第5节实验:探究弹簧形变与弹力的关系课件.ppt

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第5节,实验:探究弹簧形变与弹力的关系,一,实验基础掌握牢,二,实验创新领悟好,目 录,实验基础掌握牢,绘制Fx图像,便于实验数据处理,坐标纸,检查刻度尺是否竖直,实验创新领悟好,二,实验器材的创新,1.弹簧水平放置,消除弹簧自身重力对实验的影响。,1.用橡皮筋代替弹簧做实验。,2.改变弹簧的固定方式,研究弹簧弹力大小与压缩量之间的大小关系。,2.拉力传感器显示的拉力F与橡皮筋的弹力并不相等,仅为橡皮筋弹力在水平方向的分力。,1.用压力传感器测物体B所受支持力的大小,但与弹簧弹力大小并不相等,二者差值为m0g。,2.物体C下移的距离x为弹簧压缩量的变化量,即Fm0gk(x0x)m0gkx0kx,故Fx图线斜率的大小为弹簧的劲度系数。,图2: 利用浮力对弹簧弹力大小的影响,探究弹簧的劲度系数及钩码浮力的大小。,

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