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Circular motion. About angular motion. Which angle is bigger?. 5 degrees 5 radians 5 revolutions. Is rotating my arm quickly an example of angular acceleration?. Yes no. In class, a red ball was moved in a circle by a motor. The ball started at rest. The motor turned on. - PowerPoint PPT Presentation
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Circular motion
About angular motion
Which angle is bigger?
0
0
0 1. 5 degrees
2. 5 radians
3. 5 revolutions
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Is rotating my arm quickly an example of angular acceleration?
0
0 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?
0
0 1. Yes
2. no
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Does the red dot experience alpha ever after turning motor on?
0
0 1. Yes
2. No
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Does the red dot experience alpha ever after turning motor off?
0
0 1. Yes
2. No
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After turning off the CCW (counter-clockwise) motor, is ang. Accel…
0
0 1. Positive
2. negative
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After turning off the CW (clockwise) motor, is ang. Accel…
0
0 1. Positive
2. negative
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Is the red ball angularly accelerating? [moving in circle,
constant speed]
0
0 1. Yes
2. No
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Is the red ball accelerating? [moving in circle]
0
0 1. Yes
2. No
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Which direction is the tangential velocity at the top of a CCW circle
Up
Down
Lef
t
Rig
ht
0 000
1. Up
2. Down
3. Left
4. Right
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Which direction is the tangential velocity at the bottom of a CCW circle
Up
Down
Lef
t
Rig
ht
0 000
1. Up
2. Down
3. Left
4. Right
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Blank slide
Which direction is the centripetal acceleration at the bottom of a CCW circle
Up
Down
Lef
t
Rig
ht
0 000
1. Up
2. Down
3. Left
4. Right
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Which direction is the centripetal acceleration at the top of a CCW circle
Up
Down
Lef
t
Rig
ht
0 000
1. Up
2. Down
3. Left
4. Right
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Which way is the constant-speed object accelerating in a circle? (on left, moving CCW)
Up
Down
Lef
t
right
0 000
1. Up
2. Down
3. Left
4. right
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Which way to turn the car to make your date slide towards you?
0
0 1. Right
2. Left
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Which force is bigger at bottom of a vertical circle?
0
0
0 1. T
2. Mg
3. same
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Have you listened to any podcasts?
0
0 1. Yes
2. No
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