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Atwoo d’s Machin e
Attach the 3-step pulley to the rotating shaft. Use the thumb screw to attach the
Rotary Motion Sensor to a ring stand. Attach each end of the string to a mass
and run the string over the pulley. Use the Rotary Motion Sensor to determine
the acceleration of the system.
Moment of In ertia of a Disk
(requires Rotational Motion Accessory Kit, see Accessories section)
Attach an Ultra Pulley to the Rotary Motion Sensor. Attach the 3-step pulley to
the rotating shaft. Attach the disk to the 3-step pulley. Attach a string to the
underside of the hub. Attach the Ultra Pulley to the Rotary Motion Sensor using
the U ltra Pulley Swivel Mount. Run the string over the Ultra Pulley and attach
a weight to the end of the string. Use the weight to apply a torque to the system
while the Rotary Motion Sensor measures the angular acceleration.
Vernier Rotary Motion Sensor
(Order Code RMV-BTD)
The Vernier Rotary Motion Sensor is a bidirectional angle sensor designed to
measure rotational or linear position, velocity and acceleration. It is used for a
variety of investigations, including measurement of rotational inertia and
verification of the conservation of angular momentum.
Additional experiments and innovative uses can be found at
www.vernier.com/rmv-btd
Note: Vernier products are designed for educational use. Our products are not
designed nor are they recommended for any industrial, medical, or commercial
process such as life support, patient diagnosis, control of a manufacturing
process, or industrial testing of any kind.
What's Included
l Rotary Motion Sensor
l Thumb screw
l 3-step pulley and mounting screw
l O-ring
Compatible Software
See www.vernier.com/manuals/rmv-bt d for a list of software compatible with the
Rotary Motion Sensor.
Getting Started
1. Connect the sensor to the interface (LabQuest Mini, LabQuest 2, etc.).
2. Start the appropriate data-collection software (Logger Pro, Logger Lite,
LabQuest App) if not already running, and choose New from File menu.
See the following link for additional connection information:
www.vernier.com/start/rmv-bt d
Using the Product
Example Experiments
The following examples show various ways to use the Rotary Motion Sensor.
Some of these examples use accessory products described below.
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Videos
View videos related to this product at www.vernier.com/rmv-btd
Configuring the Sensor
The 3-step pulley can be mounted on the rotating shaft in either of two
orientations: with the wide side of the pulley near the sensor body, or with the
narrow side of the pulley near the sensor body. The easiest way to insert the
3-step pulley on the Rotary Motion Sensor shaft is hold the shaft to prevent
rotation as you turn the pulley to align the key to the slot. The o-ring can be
slipped over the outer pulley to increase friction when the pulley is in contact
with a surface.
The thumb screw can be threaded into the back of the sensor allowing the
Rotary Motion Sensor to be attached to a ring stand.
The sensor also has a set of accessory mounting holes which allow it to connect
to existing accessories.
Moment of In ertia of Point Masses
(requires Rotational Motion Accessory Kit, see Accessories section)
Use the same set up as described in the previous section. This time attach a rod
with two masses to the 3-step pulley. Use the weight to apply a torque to the
system while the Rotary Motion Sensor measures the angular acceleration.
Con servation o f Angu lar Momentum
(requires Rotational Motion Accessory Kit, see Accessories section)
Attach the disk to the 3-step pulley. Give the disk a spin. While the system is
rotating, drop a second disk onto the first disk. Observe the change in the
angular velocity before and after the mass is added to the system.
Motio n of a Physical Pendu lum
(requires Rotational Motion Accessory Kit, see Accessories section)
Attach the 3-step pulley to the Rotary Motion Sensor with the small step next
to the sensor body. Attach the center of the rod with two masses to the pulley.
Position the masses so they are not symmetric. Position the sensor so the face of
the pulley is vertical. Start the pendulum swinging, and determine the angular
acceleration as a function of the angle.
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