Seconds pendulum

How can this pendulum accurately measure time in seconds?

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Let's measure time!

This lesson presents timekeeping devices and the types and units of time measurement.

The Doppler effect

This lesson helps to understand the Doppler effect.

The brachistochrone problem

Find out whether the marble reaches the finish line faster on the straight or on the curved slope.

The Doppler effect

It is a well-known phenomenon that the sound of an approaching sound source is higher...

Putting a candle out with carbon dioxide

In this experiment we produce carbon dioxide with vinegar and baking powder.

String saw

In this experiment we prove that it is possible to cut a bottle with just a string.

Submarine operation

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

Kepler´s laws of planetary motion

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

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