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做匀速圆周运动的物体具有一定的向心加速度,从而也必然有一定的合外力作用于物体。使物体产生向心加速度的合外力方向也一定是指向圆心的。因此,通常称之为向心力,其关系为:ΣF=ma_n=m(V~2/r)=mω~2γ=4π~2f~2γm这是根据理论导出。它是否符合实际?对中学生来说,最好通过演示验证。如果教学安排是首先从实验测得向心力,然后根据牛顿第二定律导出匀速圆周运动公式,那就更需要有较为精确的实验才能得到
The objects that make a uniform circular motion have a certain centripetal acceleration, and therefore must also have a certain external force acting on the object. The direction of the external force that causes the body to generate centripetal acceleration must also point toward the center of the circle. Therefore, it is usually called the centripetal force, and its relationship is: ΣF=ma_n=m(V~2/r)=m[omega]~2[gamma]=4[pi]~2f~2[gamma]m This is derived from theory. Is it realistic? For middle school students, it is best to demonstrate by demonstration. If the teaching arrangement is to first measure the centripetal force from the experiment and then derive the uniform circular motion formula according to Newton’s second law, then more accurate experiments are needed to obtain it.