English Essay on "The Forces of Nature"
Scientists used to say that what we call nature, that is the whole universe, was made up of matter and force but nowadays they find that they atoms that make up the matter are really force so that matter itself is only a form of force. But it will be convenient to use the word force in its usual sense of energy, and to give as illustrations of the forces of nature such great powers as light, heat electricity, gravitation, and life.
The study of the first four of these forces is called the science of Physics; and Physicists have discovered a great deal about them. But we can only speak here of a few ot the more obvious effects of these forces, especially as far as they have been found useful to man.
Take the force of gravitation. The effect of gravitation is one of the most familiar experiences in everyday life, as we know when we fall down, and when we see anything that is thrown into the air fallback again to the earth. Yet no one knows exactly what this force is, Isaac Newton, the great English mathematician, discovered the law of gravitation that is the rule by which this force always seems to work; but even he could not explain what it really is. All he could say was that if seemed to be force of attraction that tends to drawn masses of matter towards each other in a certain way, namely in direct proportion to their mass and in inverse proportion to the, square of their distance. Hence the earth on which we live draws all smaller objects near it towards its centre, so that, as we say everything tends to fall on to the earth; hence the sun draws the earth towards itself, and keeps it revolving round it. But for gravitation, all the things of the surface of the earth would be flung off the earth itself would fall to pieces, and rush off in fragments into space.
Men have always been familiar with lightning; but it is only in modern times that they have identified it with electricity, and found ways of producing it and making it useful to them, in such forms as the telegraph, telephone and wireless, and harnessed it to drive engines and tram-cars, and to give them light and heat. In fact it is non supposed that solid matter itself is really a form of electricity, because the atoms of matter are composed of electrons, which are really electrical energy.
Times fails to speak of light and heat, expect to say that without them the most wonderful and mysterious force of all namely life, would be impossible. Biologists can tell us a lot about living organisms plants and animals but no one can tell us exactly what life is. All we known is that it is the force to make the seed grow into a’ great tree, and the tiny baby in a strong man: and that enables plants and animals to produce other plants and animals.
