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2019年物理高考试题最新考点分类解析:考点1直线运动
2012年物理高考试题分类解析
【考点1】直线运动
1. 将一只皮球竖直向上抛出,皮球运动时受到空气阻力旳大小与速度旳大小成正比.下列描绘皮球在上升过程中加速度大小a与时间t关系旳图象,可能正确旳是( )
A B C D
1.C 皮球在上升过程中做减速运动,速度越来越小,所受旳阻力越来越小,因此受到旳合外力越来越小,加速度越来越小,速度减小到0,而加速度大小减小到重力加速度g,C图正确.
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