The speed of the circular motion can be measured by the ratio of the arc length through which the object passes and the time used. If the object moves from M to N, a point t passes through point A. In order to describe the speed of movement through the vicinity of point A, it can be taken from this moment for a short period of time Δt, during which the object moves from A to B, and the arc length passed is ΔL. The ratio △ l / Δt reflects the speed of the object movement, called the line speed, expressed by v, that is, v = △ L / Δt. The line speed also has an average value and an instantaneous value. If the time interval taken is very small, the instantaneous line speed is obtained.

Note that when Δt is small enough, the arc AB is almost a straight line, and the length of the AB arc is almost the same as the length of the AB segment. At this time, Δl is the displacement of the object from A to B. Therefore, the v here is actually the instantaneous speed in linear motion, but it is now used to describe the circular motion. Line velocity is a vector, with size and direction, an object that makes a circular motion, its linear velocity direction changes momentarily, and always points to the tangent direction of the point.

Peripheral speed calculator:

Line speed: V = 2PIr/T

Here:

r = radius

T = time period

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