Exercise 1.6 b: Manifestations of Newton’s Laws
•
Newton’s First Law:
Every object in a state of uniform motion tends to remain in that
state of motion unless an external force is applied to it.
•
Newton’s Second Law: The relationship between an object's mass
m
, its acceleration
a
,
and the applied force
F
is
F = ma
. Acceleration and force are vectors; in this law the
direction of the force vector is the same as the direction of the acceleration vector.
•
Newton’s Third Law: For every action there is an equal and opposite reaction.
•
Newton’s Law of Gravity: Every object in the universe attracts every other object with a
force, directed along the line of centers of the two objects, that is proportional to the
product of their masses and inversely proportional to the square of the separation
between the two objects.
Newton’s 3 Laws of Motion and the Universal Law of Gravity are listed above.
For each of the factual statements concerning observable phenomena below,
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This document was uploaded on 10/27/2011 for the course ASTR 104 at UNL.
 Fall '10
 Dr.MelissaBrucker
 Astronomy

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