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 Wagon Wheel 
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Wagon Wheel

The wheel rotation smoothly varies between standing still and a maximum speed of 120 rotations per minute (120 rpm, indicated at top right). The wheel rotation, however, looks quite different: it seems to slow down to standstill when the maximum speed of 120 rpm is indicated! It helps to know that the wheel is rendered with standard movie speed: 24 frames per second.

With the thumbs of the two vertical sliders you can set the speed, the right slider is for coarse adjustment. When you begin to adjust the speed yourself, auto run switches off. Now you can observe that increasing the rotation speed, starting from zero, indeed initially speeds up the wheel, but then it begins to slow down! Find the speed (120 rpm) where the spokes stand still (the left slider helps with fine adjustment) but observe that the centre, and certain cute irregularities around the wheel still move. This tells you that the wheel still rotates, but because of the simulated slow movie speed of 24 frames per second the spokes seemingly stand still, and can even go backwards if you speed up! There are additional standstills at higher speeds, here you can check around 240 rm.

This is what you may have observed in movies (especially in Westerns with prominent spoked wagon wheels). It never in daylight (though there is a little discussion in that respect).

Play Wagon Wheel Free Online at Arcade Boss Games.
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