Science

Why Do Wheels Turn The Opposite Way On Film?

Have you ever watched a car commercial and noticed how even though the car is moving forward, its wheels appear to be turning backward? That's due to the stroboscopic effect, a strange phenomenon that comes from the interplay of the wheel's movement and the camera's frame rate. See it in action in the video below.

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The Stroboscopic Effect

Watch this effect in action with a paper plate and a jet of water.

Levitating Water Experiment

See how a strobe light can make water appear to levitate.

Resonance Pattern Experiment

Discover what happens when you put sand on a flat surface and then make it vibrate with musical tones.

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