Lecture 4
pls4.1
The Language of Motion
Media: 1.
Cart and track
2.
Tennis ball
1.
Key Kinematics Concepts
The subject of kinematics consists of the concepts of
time
t
assumed to progress at the same rate for all
observers
position
( )
t
r
r
(
( )
t
x
r
or
( )
t
y
r
for 1D motion)
( )
t
x
= scalar component along x axis
( )
t
y
= scalar component along y axis
velocity
( )
t
v
r
( )
t
v
x
= scalar component along x axis
( )
t
v
y
= scalar component along y axis
acceleration
( )
t
a
r
( )
t
a
x
= scalar component along x axis
( )
t
a
y
= scalar component along y axis
and the (mathematical) relationships between them.
Often we are ultimately interested in position
( )
t
r
r
.
Unfortunately,
Newton’s 2
nd
law directly relates forces to acceleration
( )
t
a
r
, and finding
( )
t
r
r
from
( )
t
a
r
is often a hard problem.
We will deal with this later.
We first concentrate on understanding position, velocity, and
acceleration so that we can precisely describe motion itself.
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Lecture 4
pls4.2
2.
1 Dimensional Motion
1 Dimensional (1D)
:
motion occurs along a straight line
.
Why study 1D motion?
i.
Because its description is simple.
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 Fall '11
 KODERA
 Physics, Velocity, TI

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