Newton’s Laws

Previous: Brahe, Kepler, Galileo

Isaac Newton (1642-1727, English)

I do not know what I may appear to the world; but to myself I seem to have been only like a boy, playing on the seashore, and diverting myself, in now and then finding a smoother pebble or a prettier shell than ordinary, while the great ocean of truth lay all undiscovered before me.

He created classical mechanics with his three famous laws of motion. I’ll recall the 2nd and  the 3rd.

F = ma, force equal mass times acceleration. If the force is zero, the body is not accelerated (namely, 1st Newton’s Law).

F = mcan also be written (or I prefer to write) as:



F12 = –F21, forces come in opposite pairs.

Newton’s Laws were huge, because due to their wide applicability, among other things, earthly objects and heavenly objects were not perceived anymore as two things governed with different physical rules.

Combining Newton’s Laws and 3rd Kepler’s Law, Newton arrived at the formula for the gravitational force:

FG = GMm/r2

The local gravity and the orbits of planets are caused by the same force!

Next: Escape Velocity

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4 Responses to Newton’s Laws

  1. Pingback: Brahe, Kepler, Galileo | The Quantum Red Pill Blog

  2. Pingback: Escape Velocity | The Quantum Red Pill Blog

  3. Pingback: ISAAC NEWTON (1642-1727) | HISTORY OF SCIENCE

  4. Pingback: ISAAC NEWTON (1642-1727) | A History of Science

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