Traffic jam attraction. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Traffic jam attraction. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Place two identical pieces of cork on the surface of clean water. Point the tip of the match to the middle of the cup. As soon as the distance between the plugs decreases to half a centimeter, this water gap between the plugs will itself be reduced, and the plugs will quickly attract each other.

But traffic jams tend not only to each other. They are also willingly attracted to the edge of the cup, one has only to bring them closer to it at a short distance.

The attraction of traffic jams

Why is this happening? Water wets the corks or the wall of the cup well and gradually rises up them. The surface of the water is shrinking. In a narrow gap, this contraction is more noticeable, and it pulls the plugs together or to the wall of the cup.

Author: Rabiza F.V.

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Robot lizard travels through the sand 05.04.2013

A robot lizard with C-shaped legs, created by a group of American scientists, can become a champion in moving on sand, gravel and other loose surfaces. In addition, it will help scientists in creating a full-fledged mathematical theory that describes movement on surfaces with the properties of both a liquid and a solid body.

In an article published in the journal Science, Daniel Goldman of the Georgia Institute of Technology and his colleagues note that movement on a loose surface is mathematically more complex than movement in a liquid. Scientists have developed the basic provisions of "terradynamics" and tested them in the experiment: using a 3D printer, they printed various forms of "legs" for an experimental robot weighing about 150 g.

“While the legs are convex, the robot has a large step with little body resistance, and therefore it can run fast. When the shape of the robot’s limbs is flat or concave, the performance drops,” Goldman cites the article. According to him, during the experiments it became clear that the laws of this movement are common to all loose media, including those consisting of poppy seeds, glass beads or natural sand.

Scientists believe that the advantageous form of limbs they have found for a robot can later be used to create a promising apparatus for search and rescue operations, as well as in the study of Mars.

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