Types of waves

Waves play an extremely important role in many areas of our lives.

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Forces

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

Rock-paper-scissors

In rock-paper-scissors, the least popular choice of players is paper. But is it really the...

Torsion balances

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

Thermal expansion of bridges

The length of the metal frameworks of bridges change when the temperature changes.

Kepler´s laws of planetary motion

The three important laws describing planetary motion were formulated by Johannes Kepler.

Re-lighting a candle

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

Suction pumps and direct action pumps

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

The magic chain

A spectacular optical illusion using a chain of closed rings.

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