Lecture5

Lecture5 - Lecture
5:
Newton’s
Laws
 Ph
1a



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Unformatted text preview: Lecture
5:
Newton’s
Laws
 Ph
1a

 October
13,
2010
 Newton’s
Laws
 •  First
Law:
Every
body
con>nues
in
its
state
of
rest,
or
of
 uniform
mo>on
in
a
straight
line,
unless
it
is
compelled
 to
change
that
state

by
forces
impressed
upon
it
 •  Second
Law:
The
change
of
mo>on
of
an
object
is
 propor>onal
to
the
force
impressed;
and
is
made
in
the
 direc>on
of
the
straight
line
in
which
the
force
is
 impressed.
 •  Third
Law:
To
every
ac>on
there
is
always
opposed
an
 equal
reac>on;
or,
the
mutual
ac>ons
of
two
bodies
 upon
each
other
are
always
equal,
and
directed
to
 contrary
parts.
 Transla>on
 •  First
Law:

 •  Second
Law:

 •  Third
Law:

 a = 0 if F = 0 F = ma F12 = −F21 F •  Student:
what
is





?
How
do
I
calculate
it
?
 •  Physicist:
It
might
be
weak,
or
strong;
perhaps
electric
or
 magne>c;
some>mes
aOrac>ve
and
some>mes
repulsive;
 or
a
maOer
of
gravity
 –  In
other
words:
I
wish
I
knew….
 –  Our
knowledge
of
forces
at
a
fundamental
level
is
incomplete
 –  
Gravity
+
E&M
are
enough
for
most
prac>cal
problems
 ...
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