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Newton's Three Laws
of Motion
Let us begin our explanation of how Newton changed our understanding of the
Universe by enumerating his Three Laws of Motion.
Newton's First Law of Motion:
I. Every object in a state of uniform motion tends to
remain in that state of motion unless an external force
is applied to it.
This we recognize as essentially
Galileo's
concept of inertia, and this is often
termed simply the "Law of Inertia".
Newton's Second Law of Motion:
II. The relationship between an object's mass
m
, its
acceleration a, and the applied force
F
is
F = ma
.
Acceleration and force are vectors (as indicated by
their symbols being displayed in slant bold font); in
this law the direction of the force vector is the same as
the direction of the acceleration vector.
This is the most powerful of Newton's three Laws, because it allows quantitative
calculations of dynamics: how do velocities change when forces are applied.
Notice the fundamental difference between Newton's 2nd Law and the dynamics
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This note was uploaded on 12/04/2011 for the course ANT ANT2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.
 Fall '10
 MonicaOyola
 Anthropology

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