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加速度是用来描述运动物体速度随时间变化快慢的物理量.做圆周运动(曲线运动)的物体不仅线速度的大小可以发生变化而且线速度的方向时刻在变化,因而做曲线运动的物体必有加速度。很多同学认为曲线运动中线速度大小随时间的变化快慢用物体的切向加速度at来描述,而线速度方向随时间变化的快慢则由物体的法向加速度an(即物体的向心加速度)来描述;是这样的吗?下面来逐一分析以下的相关问题.
Acceleration is a physical quantity used to describe how fast a moving object’s speed changes with time. Objects that do circular motions (curve motions) can change not only their linear velocity, but also the direction of linear velocity. Therefore, objects that make curved motions must have acceleration. . Many students think that the linear velocity of a curve motion varies with time, as described by the tangential acceleration of the object, while the speed of the linear velocity changes with time is described by the normal acceleration an of the object (that is, the centripetal acceleration of the object). Is this the case? Let’s analyze the following related questions one by one.