Six-Metal Pendulum Bob Set
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Product Code : SCL-AM-12098
Six-Metal Pendulum Bob Set (SKU SCL-AM-12098) contains six 25 mm spheres made of aluminium, brass, copper, iron, lead and zinc, each with a steel eyelet for the string. Because size is identical and only mass changes, students can show that a pendulum’s period does not depend on bob mass, and compare densities. It suits school and college physics labs. Science Lab Supplies makes the set at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, supplying institutions, tender contractors and distributors directly.
Specifications
All the technical details of the set are tabulated below. In short, six spheres of different metals share a uniform 25 mm diameter, weigh roughly 23 g to 96 g each depending on density, hang from integrated steel eyelet hooks and are stored in a rigid polymer case with fitted compartments.
| Specification | Value |
|---|---|
| SKU | SCL-AM-12098 |
| Number of bobs | 6 |
| Shape | Sphere |
| Diameter | 25 mm, uniform across all bobs |
| Metals | Aluminium, brass, copper, iron, lead and zinc |
| Mass per bob | Approx. 23 g to 96 g, varying with metal density |
| Suspension | Integrated steel eyelet hook at the top of each sphere |
| Machining | Precision machined to tight dimensional tolerance |
| Finish | Finely finished, polished surfaces |
| Storage | Rigid polymer case with form-fitted compartments |
| Guide | Quick-start guide with baseline material density data |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the Pendulum Bob Set
The set is used to prove that the period of a simple pendulum depends on string length and gravity but not on the mass of the bob, and to compare metal densities from mass and volume. Equal diameters keep air resistance the same for every bob, so mass is the only variable.
- CBSE Class 11 practical: comparing the period of pendulums of the same length using bobs of equal size but different mass, hung from a Retort Stand with Boss Head and Clamp.
- Class 11: plotting length against period squared to find g, timing ten swings on a Digital Stopwatch.
- Class 9 and 11: finding the density of each metal from its mass and the volume of a 25 mm sphere, checked with an Electronic Digital Vernier Caliper.
Keep the swing angle small, under about 15 degrees, for simple harmonic motion. Handle the lead bob only under supervision and wash hands afterwards.
Standard Scope of Supply
One set comprises six 25 mm spherical pendulum bobs, one each of aluminium, brass, copper, iron, lead and zinc, each with its steel eyelet hook, a fitted compartmented polymer storage case and a quick-start guide listing baseline material densities. String and a support stand are not included.
Packing, MOQ and Lead Time
Request a quote for one bob set or for enough sets for every pendulum station in your lab. Science Lab Supplies lists packing, delivery time and price on each quotation for that exact quantity, and stands, clamps or stopwatches may be quoted at the same time.
As a holder of an Importer-Exporter Code, Science Lab Supplies is able to ship to buyers in Egypt, Iraq, Nigeria, Kenya, Ghana and Ethiopia. Contact the company through its contact page, use the enquiry cart for a multi-item list, or check the lab tender page.
Frequently Asked Questions
Why are all six bobs the same diameter?
Identical 25 mm diameters keep air resistance the same for every bob, so when students swap metals on the same string length, any change in period could only come from mass. In practice the period stays the same.
Is the lead bob safe for students?
Lead is toxic, so the lead sphere should be handled only under teacher supervision. Wear gloves for long handling, avoid hand-to-mouth contact, and wash hands thoroughly after every practical session.
Can the bobs be used for density experiments?
Yes. Each bob is a 25 mm sphere, so its volume is the same for all six; weighing them gives masses of roughly 23 g to 96 g and a direct comparison of metal densities.
Is Science Lab Supplies the manufacturer or a trader?
Science Lab Supplies is the manufacturer of this bob set. It is machined and assembled at the company’s own factory in Saha, Ambala, India, and the factory itself prepares each quotation.
Related Pendulum and Density Apparatus
These products cover pendulum timing and metal density from other angles, including bobs in more sizes, metal cylinders and cubes, complete pendulum stands and compound pendulums, so they combine well with this set and can be added to one quotation from Applied Mechanics and Properties of Matter.
- Pendulum Bobs or Spheres — six-metal sets with hooks, offered in 12 mm, 18 mm and 25 mm sizes.
- Metal Cylinder — solid cylinders of aluminium, brass, zinc, copper, iron and lead for density work.
- Metal Cubes — cubes of different metals for specific gravity measurement.
- Pendulum Set — 300 x 200 mm front plate with 90–0–90 degree scale, 1 m cord, steel and aluminium balls.
- Mathematical Pendulum Demonstration Apparatus — mild steel base and rod, 50 cm ruler and digital stopwatch.
- Kater’s Reversible Pendulum — 120 x 1.2 cm brass bar with two sets of adjustable knife edges.
- Overflow Vessel (Eureka Can) — G.I. sheet can with flared top edge for Archimedes experiments.
Browse the full Applied Mechanics range, the Properties of Matter range for density apparatus, or all physics lab equipment.
Last updated: 9 October 2026
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