Replacing one friction with another. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Replacing one friction with another. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

There are two types of motion friction: sliding friction and rolling friction. Rolling friction is much less than sliding friction. Therefore, in technology, sliding bearings are being replaced by ball or roller bearings.

If you put a round pencil on a slightly tilted book, it rolls off easily. But if you put it along the book, then in order for it to slip, the book must be tilted more strongly.

Replacing one friction with another

To move a thick book on the table with one finger, you need to make some effort. And if you put two round pencils under the book, which in this case will be roller bearings, the book will easily move from a slight push with your little finger.

Author: Rabiza F.V.

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Random news from the Archive

Microwaves for drugs 11.06.2013

It turns out that microwave radiation, familiar to us from home microwave ovens and used to heat food, can be useful for the pharmaceutical industry. Researchers from the University of Bradford (UK) have found that the use of microwaves can provide a fast and environmentally friendly way to produce medicines.

Microwave radiation, as first proven by scientists in the UK, can be effectively used for co-crystallization, a process that creates single crystals built from two compounds. Drugs obtained in this way can outperform their competitors in terms of shelf life, water solubility and, importantly, absorption into the blood, that is, fewer doses will be needed to achieve the desired effect.

As an example, scientists used caffeine and maleic acid. These substances were not taken by chance - they have different degrees of solubility, and this often creates problems in the manufacture of drugs, forcing the use of a large amount of not always safe solvents.

During an experiment using microwaves, the researchers were able to achieve 100% crystallization in just one minute. At the same time, as a special achievement, it is noted that the amount of solvents used was minimal, which is safe for the environment, in contrast to traditional methods for the production of pharmaceutical products.

Best of all during the experiment, such solvents as water and methanol showed themselves - they transfer heat from microwave radiation most efficiently, and acetone, ethyl acetate and toluene did not show themselves in the best way.

So far, the experiment on cocrystallization using microwaves has been carried out only in laboratory conditions, but the curators of the study are confident that the procedure can be repeated on an industrial scale and completely change the pharmaceutical production process. It is microwave radiation that should be considered as one of the promising ways to create cocrystals with minimal use of unsafe solvents.

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