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Relative Position Vector
±
Position of car A
relative to car B is
given by the vector
subtraction equation
•
is the position of car A as
measured by E
•
is the position of car B
as measured by E
•
is the position of car A as
measured by car B
AE
r
r
BE
r
r
AB
r
r
Relative Velocity
Classical Mechanics
±
Describes the relationship between the
motion of objects in our everyday world
and the forces acting on them
±
Conditions when Classical Mechanics
does not apply
±
very tiny objects (< atomic sizes)
±
objects moving near the speed of light
Newton’s First Law
±
An object moves with a velocity
that is constant in magnitude and
direction, unless acted on by a
nonzero net force
±
The net force is defined as the vector
sum of all the external forces exerted
on the object
Inertia
±
Is the tendency of an object to
continue in its original motion
Mass
±
A measure of the resistance of an
object to changes in its motion due
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 Spring '06
 Buchler
 Physics

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