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PHYS1000: Chapter 2 
Newton’s 1st Law
Motion & Sir Issac Newton
•
Newton was born in 1642, just a few months after Galileo’s death.
•
As we discussed previously, while many others (Galileo, Kepler, etc.)
had discovered the various rules of motion, but no one had put all of the
pieces together.
•
In 1687, Newton wrote the
Principia Mathematica Philosophia Naturalis
(Mathematical Principles of Natural Philosophy) which provided an
overall picture of motion.
•
In
Principia
, Newton presented the
three laws of motion
AND the
mathematical framework for
calculus
.
•
Newton’s laws are amazingly
elegant and simple
and work for a vast
range of physical systems  ranging from the cellular level (10
6
m) to
planets (10
8
m).
Galileo and Inertia
Galileo’s “thought” experiments on inertia
Is a
PUSH or PULL
keeping the balls in motion?
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Newton’s 1st Law of Motion 
Law of Inertia
The first law is direct result of Galileo’s ideas about inertia.
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 Spring '08
 Thomas
 Physics, Force, Sir Issac Newton

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