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本研究目的：描述、演示体育运动中抛体运动─抛点高于落点（推铅球等）。抛点低于落点（投篮等）、抛点落点同高的最佳抛投角变化特点规律及演示仪的原理和结构。本演示仪利用体育运动与机械运动共同的力学性质，以流体压强差为动力，通过连续流体喷射点角度变化，观察不同抛落位置相应的最大射程和最佳抛射角。教学实践证明该演示仪能将体育运动中难以观察的快速抛投器械运动的力学原理、特点、规律很好地显示出来，直观效果好，设计有创新性，其力学原理学生可直观接受。
The purpose of this study is to describe and demonstrate the projectile movement in sports ─ throwing point is higher than the landing point (putting shot, etc.). Polishing point is lower than the landing point (shooting, etc.), throwing point with the best throwing angle changes the characteristics of law and presentation of the principle and structure. Based on the common mechanical properties of sports and mechanical motions, this demo instrument uses the fluid pressure difference as a driving force and observes the corresponding maximum range and the optimum projectile angle at different drop locations through the angle changes of continuous fluid injection points. The teaching practice proves that the demonstrator can display the mechanics principle, characteristic and rule of rapid throwing equipment movement difficult to be observed in sports. The visual effect is good, the design is innovative, and its mechanics principle students can intuitively accept.