Submarine operation

Submarines submerge and surface by changing the average density of the hull.

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Suction pumps and direct action pumps

Direct action pumps and suction pumps are among the simplest water pumps.

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A force can be measured by measuring the twisting of the torsion wire in a torsion balance.

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Learn how to pierce a balloon without popping it.

The faithful cork

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Forces

The animation shows the way forces act on wheeled vehicles and vehicles with runners.

The clever karate master

Can we break a stick with the weight of only a few sheets of paper?

Re-lighting a candle

Can a candle be re-lit if the flame of the match does not even touch it?

Beverage machine - Part 1

Is it possible to turn pure water into a soft drink in a few seconds?

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