Leonardo's Notebooks by Leonardo da Vinci

Author:Leonardo da Vinci
Language: eng
Format: mobi, epub, pdf
Publisher: Black Dog & Leventhal Publishers
Published: 2013-01-07T00:00:00+00:00

Force arises from dearth or abundance; it is the child of physical motion, and the grandchild of spiritual motion, and the mother and origin of gravity.

IX. Physical Sciences and Astronomy

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Force I define as an incorporeal agency, an invisible power, which by means of unforeseen external pressure is caused by the movement stored up and diffused within bodies that are withheld and turned aside from their natural uses; imparting to these an active life of marvelous power it constrains all created things to change of form and position, and hastens furiously to its desired death, changing as it goes according to circumstances.

When it is slow its strength is increased, and speed enfeebles it. It is born in violence and dies in liberty; and the greater it is, the more quickly it is consumed. It drives away in fury whatever opposes its destruction. It desires to conquer and slay the cause of opposition, and in conquering destroys itself. It waxes more powerful where it finds the greater obstacle. Everything instinctively flees from death. Everything, when under constraint, itself constrains other things. Without force nothing moves.

The body in which it is born grows neither in weight nor in form. None of the movements that it makes are lasting.

It increases by effort and disappears when at rest. The body within which it is confined is deprived of liberty. Often also by its movement it generates new force.

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