Why when watching cars travelling at high speeds do the wheels appear to be going backwards?

Why when watching cars travelling at high speeds do the wheels appear to be going backwards?
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1 Answer

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answer:I’m guessing you mainly see it in movies or, less commonly, videos. It’s a stroboscopic effect related to the fact that moving pictures are actually a rapid sequence of still frames. If the frame rate is synched to the rotation of a wheel (or to some repeating feature like the spokes of a wagon wheel) then the wheel will appear to not move, or to move slowly forwards or backwards. Using normal vision directly, motion appears as a blur. You need a discrete frame rate to produce this effect.
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