This 8 range sensor is a must for every Physics department. It is highly accurate and capable of measuring a variety of motions including: pendulum, angular, and linear.

The sensor can be used on its own or coupled with the linear rack and another sensor, such as light, to investigate the Inverse square law.

This sensor, when used for measuring motion, is best used with the Dynamics System. See also the Rotary Motion Accessory Kit.


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Activities and Curriculum: 

Physics Investigations with Dataloggers CLICK HERE for Sample 


  • Motion with kinetics trolley
  • The study of pendulum motion
  • Simple harmonic motion When used with the Accessory Kit
  • Conservation of Angular momentum
  • Moments of inertia
  • Pendulum investigations
  • Gravitational rotational energy
  • Frictional torque
  • Rotational collisions
  • Rotational inertia
  • Newton’s Second Law in its rotational form
  • Tracking movement in a circle
  • Linear displacement of an object

Biology and Chemistry: When used with the Accessory Kit 

  • Linear movement of gas syringe plunger
  • Angular Position: 0-360 degrees (Resolution: 0.1 degree)
  • Angular velocity (revs.): ±4 revolutions per second (Resolution: 0.01 rev.)
  • Angular velocity (rads.): ±40 radians per second (Resolution: 0.1 rad.)
  • Linear distance (uses the Linear rack accessory): ±200 mm (Resolution: 0.1 mm)
  • Distance using the 11 mm Pulley: ±200 mm (Resolution: 0.1 mm)
  • Distance using the 31 mm Pulley: ±2000 mm (Resolution: 1 mm)
  • Distance using the 49 mm Pulley: ±2000 mm (Resolution: 1 mm)
  • Pendulum: ±20 degrees (Resolution: 0.1 degree)

The Rotary Motion sensor has is a low friction bi-directional position sensor, which can be used to perform a variety of investigations into rotational mechanics. It contains an optical encoder, which gives a maximum of 1 024 counters per revolution of the sensor’s shaft.

This sensor can be used to measure directly:

  • Linear displacement by using any of the pulley ranges or the linear rack accessory.
  • Angular displacement using the angular position or pendulum range
  • Angular velocity using either the revolutions or radians per second range.

A spoked pulley (3177) can be used with this sensor to convert movement from one angle to another.

Works with the following Dataloggers:

VHub4 and VHub8


Rotary Motion Sensor

Steel Rod