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中学体育教学中推铅球技术较难较复杂,但在高考中它作为体育专业考试的一项素质,对普通体育生来讲则显得更为重要。然而由于教师只强调推铅球的力量和动作的速度而忽视了力的作用距离,学生在训练中只想加力和快速出手,没有力的作用距离的概念。有的学生身体没转到投掷方向就发力出手:有的铅球还没达到高速就出手;还有的手臂没伸直就出手,从而导致缩短了力的作用距离而成绩不理想。大家都知道在影响推铅球远度的诸多因素中,除重力因素外,铅球的出手速度是决定铅球远度的重要因素。因此,如何增加铅球的出手速度成为教学和训练的重点。在这里先阐述几个概念:(1)动量:表示运动物体运动特性的一种物
It is harder and harder to put shot put in middle school physical education, but it is more important as an exam of PE major in college entrance examination. However, because teachers only emphasize the speed of putting the shot put and the speed of action, they neglect the range of force. In the training, students just want to force and quickly shot, and they have no concept of the range of action. Some students did not go to the throwing direction to force their shots: some shots did not reach high speed on the shot; there is no arm straight shot, resulting in shortened the force of the distance and the result is not satisfactory. We all know that in many factors that affect the shot put distance, in addition to gravity, shot shot speed is an important factor in the determination of shot ball far away. Therefore, how to increase the shooting speed of shot put has become the focus of teaching and training. Here are several concepts: (1) Momentum: a kind of object that indicates the movement characteristics of a moving object