Good Bye Party Experiments

Czech group ended the project with Good Bye - party with Skype connection with Polish partners. While we waited for the connection, we remembered some of our experiments.

Water goes up by Jiří and Vojta

Heat conductivity

Video made by Jiří´s brother

Find more videos like this on Have fun with simple experiments

Strong Czech Eggs

Experiments made by Jiří´s brother

Find more videos like this on Have fun with simple experiments

Potential Energy - Powered Car

Our car is powered by potential energy of a weight. Pull up the weight by rotating back wheels. Potential energy of the weight goes up. Release the weight, potential energy of the weight transforms into kinetic energy of the car. The car moves.

Soap-Powered Boat

1.Cut a boat out of the index card.
2.Cut a small slot in the rear of the boat for the engine. That's where the fuel (the dishwashing soap) will go.
3.Float the boat in the container of water.
4.Pour a few drops of dishwashing soap in the engine and watch it go.
Why did the boat move? The attraction between water particles at the water's surface produces surface tension. This gives the surface a skin-like quality. Think of this thin skin-like quality like a balloon. Adding liquid soap is like popping the balloon. You break the surface tension; the thin "skin" breaks and pulls away to the sides. If there's something floating on these water particles, like the boat, it goes along for the ride. After the whole "skin" breaks the boat sinks.

Snow and salt

Put snow into a pot. Take a glass plate and wash it. Sprinkle a spoon of salt into the pot. Be careful not to throw any salt on the plate. Wait for a while and look at the pot. The pot is frozen onto the plate.

The temperature of the snow has gone down. The salt destroy the crystals of snow and makes them melt. Lots of heat is needed to melt the snow. It is taken from everything around. That´s why the temperature drops.

Water rose

Cut out a flower shape from smooth colour paper. Fold the petals firmly inwards. Put the rose on the water. Paper consists mainly of plant fibre, which is composed of extremely fine tubes. The water rises in these so-called capillary tubes. The paper swells, and the petals of the paper rose rise up.

Ice hook

Put an ice cube in a glass of water.
Take a match, lay it across the ice and try to lift the ice up with the match.
Lay the match on the ice again and scatter a pinch of salt over the match.
Count to 10 and lift the match.

Salt water does not freeze as easily as ordinary water, and scattering salt on ice makes it melt. When a substance melts, heat is consumed at the same time. This heat is taken from the moisture under the match, where no salt fell, in this case – and it freezes.

Water and air pressure

The very first experiment from Adéla and Markéta

Bouncing coin

Making a sound with a glass

A homemade video from Czech girls

Air and water pressure

Buonacy

Home made video from Veronika

Vinegar and Baking Soda Experiment

Homemade video from Leonita and Aneta from the Czech team: