牛顿运动定律单元复习题内容摘要:
合外力不为零时,一定做变速运动 C 物体受到的合外力为零时,一定处于静止状态 D 物体的运动方向就是物体受到的合外力方向 8.质点由静止开始做直线运动,所受外力大小随时间变化的图象如图所示,则有关该质点的运动,以下说法中错误的是( ) A 质点在前 2s 内匀加速,后 2s 内变减速 F/N B 质点在后 2s 内加速度和速度都越来越小 C 质点在后 2s 内加速度越来越小,速度越来越大 10 D 设 2s 末和 4s 末质点的速度分别为 v2和 v4,则 质点在后 2s 内的平均速度等于 2 42 vv 0 2 4 t/s 9.一质量为 1kg 的物体受到两个大小为 3N 和 4N 的共点力作用,这 两个共点力的夹角为 900,则这个物体产生的加速度是。牛顿运动定律单元复习题
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