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作匀速圆周运动的物体在Δt时间由A沿圆周运动到B,具有速度增量Δ=_B-_A,物体的向心加速度为向心加速度的方向与Δt→0时Δ的方向相同,因此,确定匀速圆周运动向心加速度的方向,关键在于确定Δ的方向。
The object moving at a constant circular velocity moves circularly from A to B at time Δt and has a velocity increment of Δ = _B-_A. The centripetal acceleration of the object is the direction of centripetal acceleration and the direction of Δ when Δt → 0 Therefore, the key to determining the direction of the centripetal acceleration of a constant circular motion is to determine the direction of Δ.