在抛体运动问题中,我们经常遇到一些典型曲线的曲率半径问题。曲率半径在数学上有严格的意义和表达式,在曲线方程已知的情况下,需要利用二阶导数。而在物理中的应用比较简单,分析该类题目的基本思路是首先选择在此轨道上的一种运动,然后在此运动下给出轨道上研究点的运动速率和法向加速度,最后由表达式得到研究点的曲率半径。平面曲线的曲率就是针 In the motion of the projectile, we often encounter the curvature radius of some typical curves. The radius of curvature has a strict mathematical meaning and expression. In the case of a known curve equation, the second derivative needs to be used. However, its application in physics is relatively simple. The basic idea of ​​analyzing such topics is to first select a motion on this orbit and then give the velocity and normal acceleration of the research point on the orbit under this motion. Finally, Find the radius of curvature of the study point. The curvature of the plane curve is the needle