What's stopping you from falling? Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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What's stopping you from falling? Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

What falls faster: a coin or a piece of paper? Take a coin in one hand and a small piece of paper in the other. Release them at the same time, from the same height. The coin will immediately hit the floor, and the piece of paper will fall slowly, spinning or roaring from side to side. So heavy bodies fall faster?

Let's check. Take a 1 kg weight and a penny and repeat the experiment with them. They will fall at the same moment! But you remember that a penny weighs only 1 g, that is, a thousand times less than a weight. Turns out it's not about the weight!

And in what? Take two identical pieces of paper and crumple one, roll it into a ball, and throw the other whole. Of course, crumpled will fall faster.

You can do another experiment: cut out of paper two circles the size of a three-kopeck coin. Throw one of them simply, and put the other on the snout and throw this snout flat. A circle thrown separately will flutter for a long time, and a circle thrown with a coin will fall with it at the same time.

What's stopping you from falling?

So, the weight really has nothing to do with it. Something else is holding up the paper. Some kind of invisible person prevents her from falling. You probably already guessed that these are tricks of the air! When you crumpled the piece of paper, its weight did not change, but its surface area decreased. And immediately the invisible man had nothing to rest against, nothing to grab onto. The paper ball fell quickly.

In physical laboratories they show even more visual experience. A fluff and a lead bullet are placed in a long glass tube. Then air is pumped out of the tube and the hole is sealed. Invisible is no more, he is banished! And now, if the tube is sharply turned over, the fluff and the bullet fall at the same speed!

Author: Galpershtein L.Ya.

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Explosives will improve the safety of electric cars 01.10.2019

Bosch has developed a new system that is designed to reduce the risk of electric vehicle battery fire and electric shock to people in the event of an accident.

Many potential buyers of vehicles with an electric propulsion system have expressed concern that in the event of an accident, metal parts of the car body could be energized. And this can become an obstacle in the way of saving people. In addition, in such a situation, the risk of fire increases.

Bosch proposes to solve the problem by using small explosive packs. Such charges in the event of a traffic accident will instantly cut off entire sections of cables going to the battery pack. As a result, the car will be completely de-energized.

Explosive packages can be activated by signals from various on-board sensors - for example, from airbag sensors. The CG912 microchip, which was originally designed to control the airbags, will be able to control the operation of the system.

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