Physics Lab Equipment

LEMI-21 Simple Harmonic Motion and Spring Constant

LEMI-21 Simple Harmonic Motion and Spring Constant


  • High accuracy timing device

  • High accuracy reading device

  • Affordable


This experimental apparatus integrates two innovative devices into a Jolly balance: a reading device using a pointer and a reflective mirror with a vernier; and a timing device using an integrated Hall switch sensor. Its performance has been greatly improved from conventional apparatus. Through these experiments, students can understand the law of a spring oscillator for simple harmonic motion, and learn how to measure vibrational period. It can be used for general physics teaching.


Using this apparatus, the following experiments can be conducted:


1. Verify Hooke's law, and measure the stiffness coefficient of a spring

2. Study the simple harmonic motion of a spring, measure the period, calculate the stiffness coefficient of the spring

3. Study the properties and use method of a Hall switch

The instruction manual contains experimental configurations, principles, step-by-step instructions, and examples of experiment results. Please click Experiment Theory and Contents to find more information about this apparatus.

Parts and Specifications

Jolly balance rulerRange: 0 ~ 551 mm; reading accuracy: 0.02 mm
Counter/ timerAccuracy: 1 ms, with storage function
SpringWire diameter: 0.5 mm; outer diameter: 12 mm
Integrated Hall switch sensorCritical distance: 9 mm
Small magnetic steelDiameter: 12 mm; thickness: 2 mm
Weight1 g (10 pcs), 20 g (1 pc), 50 g (1 pc)

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Schematic of system

1. Adjust knob, 2. Arm, 3. Hook, 4. Spring, 5. Initial weights, 6. Pointer, 7. Hook, 8. Mirror, 9. Weight tray, 10. Vernier, 11. Ruler, 12. Leveling screw, 13. Weights 14. Magnet, 15. Integrated Hall switch sensor, 16. Wiring socket, 17. Counter display, 18. Timer display, 19. Reset button, 20. Set/View button, 21. Trigger indicator LED.

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