考点16 实验:探究动能定理 验证机械能守恒定律
《金版教程》高考总复习首选用卷·物理(旧高考)考点16 实验:探究动能定理验证机械能守恒定律 题组一 基础与经典题1.“探究功与速度变化的关系”的实验装置如图甲。当小车在1条橡皮筋的作用下弹出时,橡皮筋对小车做的功记为W;当用2条、3条……完全相同的橡皮筋进行第2次、第3次……实验时,由于每次实验中橡皮筋的拉伸长度相同,因此第2次、第3次……实验中橡皮筋对小车做的功分别为2W、3W……,每次实验中小车获得的最大速度可由打点计时器所打出的纸带求出。(1)关于该实验,下列说法正确的是________。(填选项字母)A.打点计时器可以用干电池供电B.必须平衡摩擦力...
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