加速度是描述质点速度变化快慢的物理量,其定义式为a=ΔvΔt.由牛顿第二定律可知,对于质量为m的质点所受合外力为F时,有a=Fm,此为加速度的决定式.在运动学中,加速度保持不变的运动是典型的匀变速运动,然而,实际中质点的运动是复杂的,加速度往往随时间或位移发生变化.由于该类问题的定量研究涉及微积分知识,因此,在中学阶段这类问题一般以图象形式呈现,结合图象来考查变加速运动.下面以加速度 Acceleration is a physical quantity that describes the speed of particle velocity change, which is defined as a = ΔvΔt. It can be seen from Newton’s second law that a = Fm is the external force subjected to mass point m of mass m, which is the determinant of acceleration In kinematics, the motion with constant acceleration is a typical uniform velocity motion, however, the motion of particle is complicated in practice, and the acceleration often changes with time or displacement. Because the quantitative research of this kind of problem involves the knowledge of calculus Therefore, in the secondary stage of such problems are generally presented in the form of images, combined with the image to examine variable acceleration movement below the acceleration