Because it ticks off the seconds. The first hand ticks off the hours, and the minute hand ticks off the minutes.
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The short hand is the hour hand. The longer hand is the minute hand. If there is a third hand, it is very thin and very fast. That would be the second hand.
Angular motion.
That motion is called angular motion. The angular speed of the second hand is 2pi radians per minute.
Because it counts seconds.
In many cases, there is a third hand that ticks on seconds