Introduction

On the Internet, you can find claims that gravity does not exist. This is due to the fact that the gravitational interaction is extremely weak.

It is much more difficult to claim that there is no electrical interaction. Charged objects interact with great force. Anyone can do a simple experiment to prove the reality of this interaction. All you need to do is take an empty plastic bottle and rub it on your hair (the bottle and hair should be dry and clean). You'll create a charge on the bottle's surface, and it'll start attracting small objects (like pieces of paper or hairs).

In addition, there are many other experiments that can confirm the existence of an electrical interaction.

It's even easier with magnetic interaction. Most people have held magnets in their hands at some point, so the interaction between magnets is well known.

The book you are reading contains a description of experiments that can only be explained by the force of gravity.

You can try to repeat some of these experiments yourself. However, it should be noted that experiments with gravity require more effort and cost than experiments with electricity and magnetism.

And one more very important point. Carelessness during some experiments can lead to injury. Do not endanger yourself or others. Follow the safety rules.

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