1
Announcements
1. HW6 due March 4.
2. Midterm1:
if you want to look at your scantron,
see Prof. Chan
before end of today
3. Solutions to even number questions in textbook
starting Chapter 6, numerical values will be posted in
the HW solutions page (after HW6 is due).
The Radian
•
The radian is a unit of
angular measure
•
The radian can be
defined as the arc
length s along a circle
divided by the radius r
•
s
r
θ
=
Average Angular Speed
•
The average angular
speed,
ω
, of a rotating
rigid object is the ratio
of the angular
displacement to the
time interval
f
i
av
f
i
t
t
t
θ
θ
θ
ω
−
∆
=
=
−
∆
Unit: rad/s
Average Angular Acceleration
•
The average angular acceleration
of an
object is defined as the ratio of the change
in the angular speed to the time it takes for
the object to undergo the change:
α
f
i
av
f
i
t
t
t
ω
ω
ω
α
−
∆
=
=
−
∆
Unit: rad/s
2
Relationship Between Angular and
Linear Quantities
• Displacements
• Speeds
• Accelerations
•
Every point on the
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 Spring '06
 Buchler
 Physics, Force, average angular acceleration

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