003弹力的突变问题 精讲精练-2022届高三物理一轮复习疑难突破微专题
003弹力的突变问题一.要点精讲1.绳产生的拉力、物体产生的支持力、杆产生的支持力或拉力本质都是因形变而产生弹力。2.加速度可发生突变,度的变化需要一个过程的积累,不会发生突变。3.处理加速度突变的理论依据是牛顿第二定律。根据牛顿第二定律,F=ma,加速度a与物体受到的合力F对应同一时刻,即a为某时刻的加速度时,F为该时刻物体所受的合力;加速度与合力具有瞬时对应关系,二者总是同时产生、同时变化、同时消失。4.区分两种模型瞬时加速度瞬间变化常见的模型是通过绳、杆、弹簧把两个或多个物体连接在一起构成连接体模型。5.求解瞬时加速度的一般思路⇒⇒二.精选例题1.绳力发生突变1003弹力的突变问题(多选...
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