Bicycle and rifle bullet. Fun physical experience at home

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Bicycle and rifle bullet. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

What do they have in common? Different sizes, different shapes, different purposes... And yet a bicycle and a bullet are related. They have a common relative gyroscope!

It is on the ability of the top to maintain the direction of the axis of rotation that the well-known balance of the bicycle is based. After all, each of its wheels is a spinning top lying on its side. A stationary bicycle immediately falls on its side, a rolling one keeps straight! In the circus you can often see acrobats performing all sorts of miracles on bicycles. But at the end of the last century, all bicycles were tricycles. Not only for children, but for adults too. It turns out that a children's tricycle is not the son of an "adult" bicycle. He's more like his grandfather!

And a rifle bullet also spins in flight like a top. After all, the rifle is called that because it has screw rifling in the barrel. Sweeping along the barrel, the bullet gets a quick rotational movement because of these rifling. Therefore, during the flight in the air, it will not tumble. The axis of the bullet will keep the direction that it had in the barrel. The sharp end will always look ahead!

The same is true of modern guns. Their shells also rotate like tops, and also fly with their sharp end forward. Therefore, they fly much further and hit the target much more accurately than the round balls of ancient smoothbore guns!

And smooth-bore guns, with which the infantry of all the armies of the world were armed at the beginning of the last century, are now produced only for hunting. After all, hunters shoot with shot, and at larger game - with buckshot. Slicing is useless here anyway.

Sometimes, however, a large lead bullet, the so-called zhakan, is also fired from smoothbore guns. But the range and accuracy are not great. Therefore, for hunting dangerous predators, they still use rifles, carbines and other rifled weapons.

Author: Galpershtein L.Ya.

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Technological forecasts for the next five years 21.12.2012

IBM has released its annual list of five innovations that will change our lives over the next five years. The report talks about technologies that can have a significant impact on the way we work, act in daily life and communicate with each other.

This time the company was interested in solutions related to the senses: touch, sight, hearing, taste and smell. So, the company's engineers are confident that within five years we will be able to "feel" textile materials and other objects at a distance, this will be possible thanks to tactile technologies, for example, vibration drives built into mobile devices. As for the visual aspect, the machines will learn to independently recognize objects in images without any auxiliary prompts, analysis of the categories in which the files are located and the tags assigned to these files.

IBM is confident that within five years computers will make a big breakthrough in terms of the ability to hear and "understand" sounds. Distributed systems of sensors that perceive sounds by elements, such as sound pressure, vibrations and sound waves of different frequencies, will help machines in this. Such systems will help predict various natural disasters, such as landslides.

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