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力学原理明确指出,腾空后的人体,是按一定角度向前上方腾起的。从原理上分析,最理想的腾起角度为45°,但在实践中腾起角度只有17°～25°。跳远的腾起角不能达到45°的原因是很多的,如地斜角的存在,人体用力的特点和后蹬用力方向等。但是,最重要的原因,还是由于水平速度大大超过垂直速度。这是因为水平速度只是在跳起的瞬间创造的。加之起跳时身体向上运动要比向前运动难得多(身体重力的影响),所以完成跳远起跳时的水平速度必然大于垂直速度,因而腾起角小于45°。 空中动作的任务是保持身体在空中平衡,并为更好地完成落地技术做好准备。平衡的身体部位才能保证身体平稳地向前飞进,它对延
Mechanics clearly pointed out that after the vacated body, according to a certain angle to the front of the rising. From the principle analysis, the most ideal angle of rise is 45 °, but in practice the angle of rise is only 17 ° ~ 25 °. The reasons for the long jump angle can not reach 45 ° is a lot of, such as the presence of bevel, the force of the human body and force the direction of the pedal. However, the most important reason is that the horizontal speed greatly exceeds the vertical speed. This is because horizontal speed is just created at the moment of jumping. In addition, when jumping, the body moves upwards much more than the forward movement (the effect of body weight), so the horizontal speed at the completion of long jump must be greater than the vertical speed, so the starting angle is less than 45 °. The mission of the air action is to keep your body in balance and to prepare for a better completion of the landing technique. Balanced body parts to ensure that the body flew forward smoothly, it is delayed