1
Chap 2
Motion along a straight
line
Note – this is an outline of the lecture, print this
and take notes on it in lecture It is not the
and take notes on it in lecture. It is not the
complete lecture.
You should attend lecture to
get the complete notes
Images taken from Halliday/Resnick/Walker,
Fundamentals of Physics, 7
th
Edition, John Wiley
and Sons Inc., by permission.
Hints on HW
19 (c) When you differentiate
x
(
t
)
to find its maximum
value you will end up with a quadratic equation.
This equation has two solutions.
Choose the
correct one!
31. Read off
x
0
directly from the graph.
Now apply
x
x
=
v
+½
a
2
to two other points (you should get
–
0
=
0
t
+ ½
at
to two other points (you should get
two equations that you can solve for
a
and
v
0
).
61. Integrate
v
= d
x
/
d
t
to find distance
Position and Displacement
Displacement (1d) = final position
 initial position
1
2
x
x
x
−
=
Δ
Average velocity (1d)
1
2
1
2
t
t
x
x
t
x
v
avg
−
−
=
Δ
Δ
=
Average speed
t
s
avg
Δ
=
distance
total
Example
Position of armadillo
as a function of time
Example
m/s
2
s
3
m
6
=
=
Δ
Δ
=
t
x
v
avg
For
t
= 1 – 4 s
distanc
tota
They are the
same
m/s
2
s
3
m
6
distance
total
=
=
Δ
=
t
s
avg
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Drive along a straight road for 8.4 km at 70
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 Spring '08
 oshea
 Acceleration, Velocity, Dave Munday, Savg, Constant acceleration summary

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