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INTERVIEW INTERVIEW INTERVIEW ON INCLINED PLANE ON THE UNIVERSITY

If we go back in time you ask a man of the seventeenth century: "How did the universe?", You'd reply that consists of seven concentric spheres of crystal. In the largest
the Sun is embedded in successively smaller than the other fixed stars. (For fixed stars, then it means the planets of the solar system). He adds: "By creating melodious sounds, the spheres with their planets revolve around the Earth, who sits motionless in the center." Amazed, you ask him this question: "Why do you believe this?", And he, if he were Catholic, you say: "Why the Church teaches" if it were Protestant I would say, "Why Teach the Bible." And if you pursue us with more questions, I would say that a biblical passage in the jew leader Joshua says, "sun stopped" and that, if you must stop, it means that you are muovendo.Queste unshakable certainty, born during the Middle Ages, were destroyed by Galileo Galilei. After building a telescope, invented by copying and enhancing the optical Dutch, he observed the sky and proved experimentally that the situation was precisely the opposite: it was the Sun to be the center of the system, while the Earth and other planets revolved around him. On the motion of planets around the star gave them the name that was used then to indicate the location of a circular body revolution. Then he proved that by turning around the Sun, Earth and the planets were making a turn on themselves and called rotation. The demonstration of what Galileo confirmed Copernicus, a Polish mathematician, had suggested some ten years earlier but failed to draw definitive conclusions. Now it is prevalent among the scholars, and convinced them radically changed the direction of their research. It was not however accepted by the Inquisition, after a fierce internal debate, forced Galileo to recant his theory of self-proclaimed "godless" and "criminal conviction." Was consumed as the great divide between the Church and the "new science". In 2000 alone, thanks Pope John Paul II, the Church has apologized for errors and then re-enabled the great Italian scientist.

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How did you determine the value of the 'acceleration due to gravity? Or rather, what is the acceleration due to gravity?

's acceleration of gravity is the value of the quantity that governs the motion of bodies falling toward the center of the Earth, just as attracted by the force of gravity exerted by the planet Earth. I could us studying and observing the fall of well-polished ball down an inclined plane, also well polished. We can describe it?

Therefore, the motion of the ball depends on the angle of inclination of the plane and simple measurements at different angles are able to calculate and obtain a value slightly less than what we now know (g = 9.8 m / s ²).

This occurs in the absence of friction, however, when the latter is what happens?

If the friction is not negligible, the acceleration can be calculated taking into account the component perpendicular to the inclined plane. Indeed, it is responsible for the presence of friction.

There can you please describe his experiment on an inclined plane?

With the experiment I changed radically inclined plane of the Aristotelian idea of \u200b\u200bmotion, focusing on speeding, a level of motion ignored by Aristotle and most of his successors. I said:-In a straight edge, or vogliàn current dir, of wood, about 12 long arms, and off to one side arm and half for the other three fingers, this was less a sunken trench width, slightly larger d 'a finger tiratolo dead-straight, and to have it clean and smooth, incollatovi into a tusk and glazed parchment to you, you made it down in a bronze ball hard, well rounded and clean. " With all these points I wanted to make negligible the effects of friction. Rise above the horizontal plane one end (of regulation) an arm or two at will, was left off for that channel the ball, noting that the time consumed in entire scroll, repeating the same note many times to make good the amount of time. Facts and establish precisely this, we did go down the same ball for only a fourth of the length of its channel, and measured the time of his descent, he was always punctual to be half the other. " Repeating the measurement for different distances, I deduced that the distance traveled is always proportional to the square of the time taken to travel. In other words, if times are represented by 1, 2, 3, 4, 5 ... the distances traveled are respectively represented by 1, 4, 9, 16, 25 ... This is the first description of the motion defined by my time on, "uniformly accelerated" ..

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SULL'ISOCRONISMO

When he became interested all'isocronismo?

My first interest in the pendulum was a time I was in the Cathedral of Pisa for a religious function. As my mind distracted followed the long sermon, I saw a priest holding a candlestick. The chandelier hung from the ceiling by a long rope and the priest pulled him aside. When he finished the sermon, the priest left that the chandelier began to sway. I looked at him and began to consider the time it takes to make a swing full circle. To measure time, swing sfruttai the beat of my wrist, and while the oscillations gradually decreased in size, I made an amazing discovery: he had the same swing every time, even though each had a width less than the previous year. Not sure what the eyes and the pulse of the wrist were proving to me, I ran home to repeat what I had seen in the Cathedral. Semplificai the experiment by replacing the chandelier a pendulum, a simple small weights tied to a string. What he discovered in 1602? In 1602 I made the greatest discovery about the pendulum. I discovered that the time of oscillation depends on the extent of the arc is not completed (isochrone). I found out by producing two pendulums of equal weight with different initial elongation, and counting the number of complete oscillations in the same period of time. To my amazement I saw that the pendulum with an initial elongation of 5 degrees had the same period of oscillation with the initial elongation of 45 degrees.

She is really a genius! I wonder how many people will be taught these things?

"We can not teach anybody anything, but we can help everyone make their own discoveries. In scientific matters, the authority of thousands of people worth the humble reasoning of a single individual. "

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INTERVIEW INTERVIEW FOR INTERVIEW ON THE SCIENTIFIC METHOD

It 's true that she was the first Italian to introduce the scientific method?

Yes, I was the first to formally introduce the scientific method, with which it has a set of criteria still valid: I think the book of nature is written in accordance with mathematical laws and understand them you need to experiment with the objects that it makes available to us. Later they will say that I have implemented a Scientific Revolution, that is a radical change, not a circular path where every time you return to the starting point, but a veritable explosion of human thought, thanks to you today as you come to the computer. Even today, modern science makes no distinction between the theoretical and experimental aspect, what do you think?

Neither one nor the other, are dominant, as it is part of the scientific method a theoretical model that explains an experimental observation advances and future observations. One of the basic points is the reproducibility of the experiments, namely the possibility that a given phenomenon can be replicated and studied in laboratories around the world.

is true that it is not always possible to reproduce some experimental observations of nature?

Yes, it is true, In fact, for example, in some sciences such as astronomy or meteorology, it is not possible to reproduce many of the observed effects and then resort to observations and digital simulations. Another example is the 'evolution of Charles Darwin, which would require to be verified by directly observing time so long as to be reproducible in the laboratory (except bacteria), in which case the experimental tests are based on generations, the fossils and experiment with micro-organisms whose reproductive cycles are extremely short.

His contemporary was Francis Bacon, who was he?

right, was my contemporary Francis Bacon, however, which belongs inductivist current, which then also join Newton. Bacon tried to build a rigorous method to which he wanted to bring all description and statement about the world and through which they can avoid the prejudices that hinder a real perception of the phenomena of nature.

short, we can describe this scientific method?

The scientific method proceeds in conformity with meaningful experiences and necessary demonstrations, one and the other supplementing and correcting each other, giving rise of scientific evidence, which does not consist in the bare and empty in the passive observation or theory. Experience is the scientific experiment. Aristotle also held in great account of the observation. I said myself that Aristotle puts the sensible experience to all speeches. In fact, while he writes to estimate the heavens unalterable, because none has seen something new generarvisi or dissolve the old, is implicitly makes clear when he had seen one of these accidents would have rated the opposite and placed on it, as appropriate, the sensible experience in natural speech. But my experiment is very different from the observation of Aristotle. Aristotle's observation is close to the experience of common sense, while the experiment is the methodical nature of the question, which presupposes a language in which to formulate questions and vocabulary to read and interpret the answers. My experience is a synthesis of scientific observation and rigorous reasoning. In my experiment, the mind is not passive, makes assumptions, extracts with severity of consequences and then goes to see if they are given or not in reality. The mind is not subject to scientific experience, makes and designs. And made to see if his assumption is true. The perceived reality is the result of a planned experiment, is an attempt to force nature to answer. We can summarize the scientific method with the pattern shown above.

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TELESCOPE

Mr. Galilei was she who invented the telescope?

No I have only improved. The first telescope was born in Holland in 1604. The inventors are not known because they wanted to keep their identity secret.

As the telescope is built?

I to build the telescope I used a piece of wood drained and cut in half and I put in two lenses at the end, two lenses that Molai making a concave and one convex with a focal length of 75-100 cm. I worked a lot, but eventually I managed to improve it and finally managed to power of 8, 20, 30 times.
In that year he appeared in Italy? There appeared

Only in 1608, four years after the discovery made by the Dutch.
There have been other discoveries of telescopes?
Not really, but in 1352 there is evidence on the use of eyeglasses.

which houses the telescope?

is preserved in the Museum of Science and Technology in Florence.

Why did you decide to build even the hydrostatic balance?

Why was attracted by some readings of Archimedes and some experiments for the measurement of specific gravity of bodies.

When he made the first scales?

was in 1586.

How was it built?

It consisted of a lever device. The end of the arm which was fixed a counterweight, was wrapped in a wire. The displacement of the counterweight, was determined very accurately by counting the number of turns of wire along which it moved.

There was a Treaty for this invention?

Yes, but it was published posthumously in 1586 .

When was the first example?

A copy of hydrostatic balance was built in 1608, after my death.

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The universe is this great book which stands continually open to our eyes

"Philosophy is written in this grand book which stands continually open to our eyes (I mean the universe), but it can not be understood without first learns to comprehend the language and know characters, it 'which is written. It is written in mathematical language, and its characters are triangles, circles and other geometric figures, without which means it is humanly impossible to understand a word without these one is wandering through a dark labyrinth. "
(The Assayer , Chapter VI)

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Family Conflicts

While Bella Proff is completing his project on conflict management for couples and families is disarmed applying it at home. The conflict had been simmering for last night, but the men of the house had been very good to avoid: one went to bed while the other came home, went out for a while to get to work the other rose, while playing a computer to the other comes home from work ... to dinner. The arguments begin generic type with the usual comments about the time television in the background. A background that becomes fatal when he starts talking about the controversy over the Inter-Lazio game yesterday. Light a fuse and detonate the bomb was one. Suddenly Bella Professors found that the child knows all the Lazio match in Rome did not allow any victory at Lazio: dates, players, fouls and penalties. Think back to the difficulties in studying it when he went to school and smiles. On the other hand, the outraged husband Romania continues to cry "shame" still unable to digest the bitter defeat because was one of those who had believed in the league. As the conflict turned into guerrilla warfare with the disappearance of his son with Lazio semisbattuta door, Bella Profs finished eating quiet trying to see if there might be good ideas to be proposed in its draft. There are conflicts can not be mediated: that between a son and a husband Lazio Roma player must fall in this species.