专题08 力学中三大观点的综合应用

目录

01动量与能量观点的综合应用 2

考向一 子弹打木块 滑块与滑板 滑块与弹簧类问题 2

02 力学三大观点的综合应用 10

考向一 力学三大观点的综合应用 10

01动量与能量观点的综合应用

考向一子弹打木块 滑块与滑板滑块与弹簧类问题

4．（2023·山东潍坊·统考模拟预测）（多选）如图所示，劲度系数为k的轻弹簧下端悬挂一质量为M的托盘，处于静止状态。现将一质量为m的粘性小球自距盘面高度为h处无初速释放，与盘发生碰撞后未反弹，碰撞时间极短。不计空气阻力，重力加速度为g，运动过程中弹簧始终处于弹性限度内。下列说法中正确的是（ ）

5．（2023·四川攀枝花·统考一模）（多选）如图所示，滑块A、B用轻质弹簧连接后静止在光滑水平面上，滑块A与左侧竖直固定挡板接触。现对滑块B施加一水平推力F使滑块B问左缓慢运动到某一位置后保持静止，一段时间后撤去推力F。弹簧始终处于弹性限度内，关于弹簧和滑块A、B，下列说法中正确的是（ ）

A．推力F做的功等于弹簧增加的弹性势能

B．当弹簧恢复原长时，滑块A开始离开挡板

C．从撤去推力F到滑块A离开挡板的过程中，弹簧和滑块A、B组成的系统动量守恒

D．从滑块A离开挡板到滑块A、B共速的过程中弹簧对A、B两滑块做功的大小相等

11．（2023·黑龙江·校联考模拟预测）如图甲所示，在光滑水平面上静止的小物块A和长木板B质量均为m=2kg，小物块A位于长木板B的左端，二者之间的动摩擦因数μ=0.1。t=0时刻小物块A获得水平向右、大小为v0=7m/s的初速度，同时给小物块A施加如图乙所示的水平向右的作用力。5s时长木板B与其右侧竖直挡板发生第1次碰撞。5s后撤去小物块A所受的水平作用力，最终小物块A没有从长木板B上滑下。长木板B与竖直挡板的碰撞均为弹性碰撞，碰撞时间极短，碰后长木板B的速度大小不变，方向相反。重力加速度g取10m/s2，求：

（1）0~5s内水平作用力的冲量大小；

（2）t=0时刻长木板B右侧与竖直挡板的距离；

（3）长木板B与竖直挡板第2次碰撞前的速度大小，并通过计算分析是否会发生第3次碰撞。

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专题08 力学中三大观点的综合应用

古雁融3589一根弹簧原长10cm悬挂10N重物时长度为12CM当挂9N的重物时弹簧伸长到多少.弹簧的劲度系数是多少啊 -
那肩欧18993226008 ______[答案] 由力F等于kx,k为弹簧的劲度系数.所以10N等于k乘以0.02米,求出弹簧的劲度系数为500N每米,所以当悬挂9N的重物时弹簧伸长1.8厘米.

古雁融3589一根轻质弹簧,当他受到十牛顿劲的拉力时长度为12㎝,当它受25牛顿的拉力时长度为15㎝,问弹簧不受力的自然长度为多少?该弹簧的劲度系数为多大? -
那肩欧18993226008 ______[答案] 设劲度系数k,自然长度l,则k(12-l)=10 K(15-l)=25,联立以上两式的K=5N/m,L=10cm

古雁融3589关于弹簧的劲度系数 -
那肩欧18993226008 ______ 弹簧的劲度系数与其匝数和长度成反比,可以举一个例子: 把两个相同的弹簧串联起来,给它们一个力,则它们的伸长量是一个弹簧时的两倍,所以它们两个组成的弹簧的劲度系数是原来的一半.

古雁融3589用10牛顿的力拉一根弹簧,弹簧伸长了2cm,弹簧的劲度系数是多大,倘若弹簧伸长3.5cm,需要多大 -
那肩欧18993226008 ______ 所以当x=3.5cm时,F=0.035x500=17.5N.希望对你有所帮助 还望采纳~~

古雁融3589什么是弹簧的劲度系数?怎么计算? -
那肩欧18993226008 ______ F=kx劲度系数为k

古雁融3589弹簧劲度系数大小如何算出的
那肩欧18993226008 ______ 弹力 除以 拉长或缩短的弹簧程度= 弹簧劲度系数

古雁融3589关于劲度系数劲度系数是什么意思 -
那肩欧18993226008 ______ 劲度系数=弹力/长度的变化量 它的含义是:弹簧单位长度变化时弹簧产生的弹力

古雁融3589弹簧弹力的大小与哪些因素有关
那肩欧18993226008 ______ 弹簧弹力的大小只和两个因素有关系:一是材料的硬度,物理上用劲度系数表示;二个形变量的大小,形变量越大,弹力越大.如果是弹簧则有F=KX,即弹簧的弹力大小和长度的变化量成正比(不是长度),其中的K就是材料的劲度系数,弹簧中径等于弹簧外径.

古雁融3589弹簧的劲度系数为什么大于1 -
那肩欧18993226008 ______[答案] 劲度系数是物质性质决定的,它反应的是弹簧每伸长一米会产生多大的力,也就是俗说的弹簧越紧,系数越大,这个系数是大于零的任一值,所以可以大于一.

古雁融3589弹性劲度是什么 -
那肩欧18993226008 ______ 劲度系数的定义 它描述单位形变量时所产生弹力的大小,k值大,说明形变单位长时需要的力大,或者说 弹簧“硬”.劲度系数又称刚度系数或者倔强系数.劲度系数在数值上等于弹簧伸长(或缩短)单位长度时的弹力.劲度系数的公式 胡克...