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Uniform Circular Motion
Uniform circular motion is the
motion of an object traveling at
In a uniform circular motion the
(instantaneous)
acceleration
points
Uniform circular motion is the motion of an object traveling at a
constant speed
v
on a circular path of radius
r
.
motion of an object traveling at
a constant speed
v
on a
circular path of radius
r
.
a
1
a
2
toward the center,
r
a
c
2
v
and its magnitude is
Sometimes speed
v
is not given directly. Instead, period T is given.
e.g. a ball revolves twice every second.
Period T: time to complete one revolution.
T
r
v
2
Previously, Average acceleration for a car traveling in a circle
with constant speed
a
av
v
t
i
f
v
v
v
i
f
v
v
v
What is the average acceleration?
X
Velocity is a vector, with
magnitude
and
direction
. If one of these two factors
0
i
f
v
v
changes, then the vector changes.
i
f
v
v
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CPS Question
•
A car travels at a constant speed around a circular
track. Which statement is true concerning this car?
(a) The car is characterized by constant velocity.
(b) The car is characterized by constant acceleration.
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This note was uploaded on 11/06/2010 for the course PHYSICS 1220 taught by Professor Yung during the Fall '09 term at Missouri (Mizzou).
 Fall '09
 yung
 Physics, Circular Motion

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