1. Tight nut of starting disc, 2. Tight bolt of wire adjustment, 3. Wire adjustment knob, 4. Starting disc, 5. Wires, 6. Suspending disc, 7. Photoelectric receiver, 8. Receiver post, 9. Suspending arm, 10. Tight bolt of suspending arm, 11. Post, 12. Diode laser, 13. Adjustment feet, 14, Base, 15. Connection wire, 16. Counting timer, 17. Small cylindrical sample, 18. Disc sample, 19. Ring sample, 20. Light blocker.

LEMI-18

Apparatus of Rotational Moment of Inertia

Features

Optical rail for simple adjustments

High accuracy

Affordable

Introduction

Moment of inertia is a physical quantity for the representation of the inertial amount of a rotational object. It is dependent on the mass distribution and the shaft position of the rigid body.

This apparatus uses the three-string pendulum method to determine the moment of inertia of a rigid body. A photoelectric sensor combined with a time counting device is used to measure the torsional oscillation period of a hanging plate. Through the experiments, students can understand the physical principle of the moment of inertia and learn the measurement method with factors related to the amount of moment of inertia.

Using this apparatus, the following experiments can be conducted:

1. Measure the moment of inertia using the three-string pendulum method

2. Measure the moment of inertia of two objects of same mass but with different mass distribution

3. Verify the parallel axis theorem of moment of inertia

Specifications

Description	Specifications
String Length of the Pendulum	> 500 mm
Timing Resolution	1 ms
Preset Count Number	< 66
Specimen	small cylinder (2), circular disc (1), circular ring (1)

Part List

Description	Qty
Host Apparatus	incl base, slider, hanging arm, hanging disc, starting disc, pendulum strings
Laser Diode	1
Receiver	1
Counting Timer	1
Connection Wire	2
Circular Lever	1
Cylindrical Sample	2
Disc Sample	1
Ring Sample	1
Manual	1

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