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Re: Smart PASCO Pulley



Tim,

Is the disk perfectly balanced and is it rotating vertically? I noticed a
similar effect when using video analysis to analyze a vertically rotating
bicycle wheel. The angular velocity and angular momentum showed a slight
oscillation. When watching the video and the corresponding graphs, I
concluded that the wheel was not balanced.

Bob Carlson

In a message dated 97-03-28 23:59:30 EST, you write:

<< I was using the Smart PASCO Pulley today with Science Workshop Software.
The smart pulley is in constant contact with a rotating disk so that
as the disk spins the smart pulley spins.

The angular acceleration should be negative at all times during a
"spin down" of the disk (the angular velocity constantly decreases on
the table and graph of data). Instead there is an alternating pattern
of negative and positive angular accelerations on both the table and
the graph of the acceleration.

Is anyone familar with this equipment and results?

Writing this note makes me wonder if there is a data sampling rate that
needs tweaking...but the question is posed for assistance! Thanks.

Tim Burgess
>>