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Announcements
1. HW8 due March 17
(after spring break)
.
2. Week of March 16 and 18 (after spring break)
Prof. Detweiler will give lectures
Profs. Chan and Hirschfeld will not hold office
hours during that week
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View Full Document Last time: rotational motion
s
r
t
t
measured in rad
“”
in rad/s
“”
in rad/s
2
angle
angular velocity
angular acceleration
t
v
t
v
t
v
directions of tangential velocity
v
t
and angular frequency
Right Hand Rule
Angular velocity is a
vector
out of screen
R
V
t
R
V
t
magnitude
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View Full Document A 0.5 kg ball that is tied to the end
of a 1.5m light cord is revolved in
a horizontal plane, with the cord making
a 30 deg angle with the vertical.
a) Determine the ball’s speed
b) Now the ball is revolved so
that it’s speed is 4.0 m/s.
What
angle does the cord make with
the vertical?
Example: horizontal circle (from HW!)
t
a
c
a
• The tangential component
of the acceleration
is due
to changing speed
• The centripetal component
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This note was uploaded on 09/07/2011 for the course PHY 2053 taught by Professor Buchler during the Spring '06 term at University of Florida.
 Spring '06
 Buchler
 Physics

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