Circular motion
About angular motion
Which angle is bigger?
1. 5 degrees
2. 5 radians
3. 5 revolutions
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Is rotating my arm quickly an
example of angular acceleration?
1. Yes
2. no
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In class, a red ball was moved in a
circle by a motor.
• The ball started at rest.
• The motor turned on.
• The ball sped up until it reached the
motor’s “maximum” velocity.
• The motor was turned off.
• The ball slowed down until it stopped.
Does the red dot experience alpha (angular
acceleration) after revolving a while, while
the motor is still on?
1. Yes
2. no
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Does the red dot experience alpha
ever after turning motor on?
1. Yes
2. No
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Does the red dot experience alpha
ever after turning motor off?
1. Yes
2. No
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After turning off the CCW (counterclockwise) motor, is ang. Accel…
1. Positive
2. negative
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After turning off the CW (clockwise)
motor, is ang. Accel…
1. Positive
2. negative
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Is the red ball angularly
accelerating? [moving in circle,
constant speed]
1. Yes
2. No
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Is the red ball accelerating?
[moving in circle]
1. Yes
2. No
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Which direction is the tangential
velocity at the top of a CCW circle
Up
Down
Left
Right
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D
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t
6
ig
h
5
0
R
4
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ft
3
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ow
n
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U
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p
0
Le
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40
Which direction is the tangential
velocity at the bottom of a CCW circle
Up
Down
Left
Right
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ig
h
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ft
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ow
n
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p
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Le
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Blank slide
Which direction is the centripetal
acceleration at the bottom of a CCW circle
Up
Down
Left
Right
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ig
h
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ft
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ow
n
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p
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Le
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Which direction is the centripetal
acceleration at the top of a CCW circle
Up
Down
Left
Right
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ig
h
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Which way is the constant-speed object
accelerating in a circle? (on left, moving CCW)
Up
Down
Left
right
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ht
5
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r ig
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Which way to turn the car to make
your date slide towards you?
1. Right
2. Left
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Which force is bigger at bottom of a
vertical circle?
1. T
2. Mg
3. same
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Have you listened to any
podcasts?
1. Yes
2. No
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