PASCO PS-2120A Rotary Motion Sensor - Manual (Page 10)

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R o t a r y M o t i o n S e n s o r E x p e r i m e n t 2 : R o t a t i o n a l I n e r t i a o f D i s k a n d R i n g
10 E x p e r i m e n t G u i d e
Setup
1. Mount the Rotary Motion Sensor (RMS) on a
support rod and connect the sensor to the inter-
face.
2. Mount the Super Pulley with Clamp to the end of
the RMS.
3. Tie one end of a thread to a Mass Hanger and the
other end of the thread to one of the levels of the
3-step Pulley on the RMS.
4. Drape the thread over the Super Pulley such that
the thread is in the groove of the Super Pulley
and the Mass Hanger hangs freely.
5. Adjust the Super Pulley with Clamp to an angle
so that the thread runs in a line tangent to the
point where it leaves the 3-step Pulley and is
straight down the middle of the groove on the
Super Pulley. See Figure 2.4.
6. Place the disk directly on the 3-step Pulley as shown in
Figure 2.3.
7. Place the ring on the disk, inserting the ring pins on the
bottom edge into the holes in the top of the disk as
shown in figure 2.5.
T
mg
a
Figure 2.3: Rotary Motion Sensor
Setup and Free Body Diagram
Mass Hanger
and mass
Support
rod
Thread
Disk
Hole for
Ring Pin
Figure 2.4: Super Pulley Position
Super Pulley
with Clamp
3-step Pulley
Figure 2.5: Setup for Disk and Ring
Rotary Motion
Sensor
Super Pulley
with Clamp
Ring