Running track

Running track, The faster down line 

Demonstration effect: the two are the same size and quality of pellet respectively from two different shapes (a track is bent, a track is straight, two orbital highs and lows are same) rolling down the orbit, the phenomenon is: through the curved track balls to reach the lowest place, walk straight after the ball reached the lowest place.

Scientific principle: as the first half of the curve track than the straight line rail, small ball through the speed increase fast, so although than the straight line rail curve track, long or the curve balls on the tracks to the finish line first.Take the ball through the fastest, takes the shortest curve is cycloid, also called the MRT line or the brachistochrone.

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