MIT Physics Demo -- Wave Superposition

A single pulse creates two waves of one-half amplitude. When the waves pass each other they add constructively to create the original pulse.

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Entropy - Sixty Symbols

Broken vases, cups of tea and a scientist's tombstone - welcome to the world of entropy.

Source:  Sixty Symbols

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Follow-up:

JJ Thomson's Plum Pudding Model of the Atom

JJ Thomson proposed the first model of the atom with subatomic structure. He had performed a series of experiments and was credited with the discovery of the first sub-atomic particle, the electron. He therefore proposed a new model of the atom called the plum pudding model. In this model, the plums represent negatively charged electrons which can be plucked out of the atom, leaving behind some positively charged pudding. In this film, cherry tart is used as a delicious substitute for plum pudding.

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Synchronization of Metronomes

Five metronomes are set to 176 bpm and placed on a Foam Core board. When empty cans are placed underneath, the board is free to move from side to side and the metronomes are able to influence each other into synchronization. When the cans are removed the metronomes are no longer physically coupled and some of them begin to fall out of step.

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Variation of the electric current in a DC motor

The current drawn by a simple motor may vary in time depending on what the motor does at any given instant.

Source:  Horatiu Pop

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Quick Demo: Variation of the electric current in a DC motor from Horatiu Pop on Vimeo.