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ME 242
Dynamics
February 9, 2009
Eric Wang
Today’s Key Concepts
Chapter 3: Kinetics of a Particle
• Newton’s 2
nd
law:
In Cartesian Coordinates
F
=
d
dt
mv
( )
Newton’s 1st Law:
A body at rest, will remain at rest
unless acted on by a nonzero net
force
(a body moving in a straight line will continue
in a straight line).
F
∑
=
F
1
+
F
2
+
F
3
=
0
Newton’s 2nd Law:
When a body is acted upon by a
nonzero net force, the net force is
equal to the time rate of change of
the body’s linear momentum
F
∑
=
d
dt
XYZ
mv
( )
Newton’s 3rd Law:
For every action, there is an equal
and opposite reaction
Newton’s 2nd Law:
For constant mass system:
F
∑
=
d
dt
XYZ
mv
( )
F
∑
=
ma
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Cartesian Coordinates
sign with the
understanding that we always mean
the sum
F
∑
=
ma
F
x
=
ma
x
=
m
˙
˙
x
F
y
=
ma
y
=
m
˙
˙
y
F
z
=
ma
z
=
m
˙
˙
z
Vector form
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This note was uploaded on 09/19/2009 for the course ME 242 taught by Professor Kam during the Spring '06 term at Nevada.
 Spring '06
 KAM

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