Articulo newton

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  • Publicado : 27 de octubre de 2010
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Sir Isaac Newton had a pet cat. Letting him in and out of the house required that he opens and closes the door each time this need arises.
Newton then cut a small hole at the bottom of the door, big enough to for the cat to go out and come in as he pleases.

The cat was pleased, really pleased.

In fact, the cat, standing stiff on all fours, lookedup at Newton's face, with its tail right up on full mast, and in sheer gratitude purred out a long "kr-rrr-ngyeaow."

Months later the cat had a kitten.
Newton's action then was to cut a smaller hole at the bottom of the door, adjacent to the one he had previously cut, so that the kitten could enter and exit the premises as freely as his mother.

"How very considerate of Isaac!" Thought thecat. Previously he had a hunch that Isaac was a highly intelligent homo sapien.

However, after this incident, the cat, although grateful, was somewhat confused, and remained that way for a while.


A major part of Newton's fame comes from having discovered the laws governing motion, and although these laws seem too obvious to some, application of these laws is necessaryto arrive at conclusions in problems concerning motion, especially in calculations which govern predicting positions of celestial bodies which are in motion.

The first of these laws states that every object is in a state of rest or uniform motion unless and until compelled by some external force to cause a change to this state of rest or motion.

Celestial bodies are in constant motion, and ifany noticeable change occurs to this consistency, then there is certainly an external cause. Astronomers and scientists are required to investigate. Changes which are measurable are usually attributed to changes in gravitational fields in the vicinity which in turn is caused by other events.

The key to detecting other events are triggered off when changes are noticed in the motion of certaincelestial bodies.


Newtons second law of motion would not seem too obvious to some or many. It simply shows the relationship of the mass of an object in motion with it's acceleration and the force which causes the motion. It states that the force causing the acceleration is equivalent to the mass of the object multiplied by it's acceleration.

The third law statesthat every action has an equal and opposite reaction. Here is my version of an example, an attempt to explain the third law.


An object weighing one pound is placed on a table. Now, if suddenly the table ceases to exist. The object will then fall to the ground. Well, the force that is causing the object to fall is its weight. In order to stop the object in its tracks, it isobvious that a force equivalent to the weight of the object should be applied in the direction exactly opposite to the motion of the falling body.

This is exactly what the table did. The table, merely by being there did not stop the object from falling. It exerted a force equal to the weight of the object in the direction opposite to the direction of the weight of the object.

If you hold an objectover the ground and then release your grip on it, the object falls until it hits the ground. What should you do in order to prevent the object from falling? You need to first determine what it is that is causing the object to fall, right?
Right! Its gravity of course! ... Isn't it?

Nonsense! Gravity has nothing to do with it! ...

Say what? ... What's up then?

Well, let me tell you, itis the weight of the object and nothing but the weight of the object!

It is indeed the weight of the object that is causing it to fall!

How come?

You see, if the weight of the object was zero, then gravity would not be able to influence it at all! You could place it in mid air and it would stay there till doomsday!

So, now that we know what causes the object to fall, we will be able...
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