The World Is Wicked. Goals Make Physics Easy

Sometimes nature it is very difficult to analyze.

Heck, if you take a tennis ball and throw it in the room, though this is very difficult. When it gets out of your hands, the ball has a gravitational pull with the Earth, causing it to accelerate to the ground. The ball rotates as you move, which means that there may be more pulling on one side of the ball than the other. The ball also strikes with other molecules of oxygen and nitrogen in the air — and others these molecules can interact with each other more air. The air itself is not stable – its frequency changes as the ball rises to the surface, and the air can move. (We often call it the wind.) And as soon as the ball hits the ground, even the floor is not flat. Yes, it looks smooth, but it is on the surface of a spherical planet.

But all is not lost. We can still copy this thrown tennis ball. What we need is a good idea. This is a myth that turns an impossible problem into a problem that can be solved.

In the case of tennis, we can assume that the whole mass is centered (in other words, that the ball has no precise dimensions) and that the only force acting on it is constant gravity. . Why is it best to overlook all such experiences? It’s because they don’t just make a big difference (or even measurement).

Is this acceptable in court of physics? Well, science only deals with the process of making colors, including the equations of the tennis ball method. At the end of the day, if the test indicators (where the ball is falling) match the pattern (predict where it will arrive), then we are good to go. In terms of tennis, it all works out very all right. Instead, the physics of throwing a ball becomes a test question in the first class of physics. Some goals are complex, such as trying to determine the Earth’s orbit just by looking at it The longest terminal at Atlanta airport. But astronomers do that on a regular basis.

Perhaps the most famous suggestion was made by Galileo Galilei during his study of his movement. He was trying to find out what would happen to the moving object if you had no control over it. At that time, almost everyone followed the teachings of Aristotle, who said that if you did not use force, you would stop and stop breathing. (Even though his work was about 1,800 years old, it was thought that Aristotle was far from perfect.)

But Galileo refused. He thought it would continue to move fast.

If you want to learn a moving object, you need to measure all that has time so that you can calculate its speed, or its proportions divided by time changes. But there is a problem. How do you accurately measure the time of things moving very fast over a short distance? When you drop something even smaller, about 10 feet, it takes less than two seconds to reach the ground. And back in the 17th century, when Galileo was alive, this was a particularly difficult time to measure. As a result, instead, Galileo watched the ball pass by.

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