Quick Answer: Assorted Metal Bob Collection is a set of 6 solid spherical bobs, one each in brass, aluminium, copper, zinc, iron and lead, each with a small suspension hook and offered in 12 mm, 18 mm or 25 mm diameter.
Last updated: October 2026
Key Features
6 solid turned spherical bobs
One bob each of brass, aluminium, copper, zinc, iron and lead
Diameter options: 12 mm, 18 mm or 25 mm
Small hook on each bob for pendulum thread
Technical Specifications
Specification
Value
Quantity
Set of 6 bobs
Metals included
Brass, aluminium, copper, zinc, iron and lead
Shape
Solid turned sphere
Available diameters
12 mm, 18 mm or 25 mm
Suspension provision
Small hook on each bob
About This Product
Because every bob in a chosen size has the same shape but a different metal, students can weigh them to compare mass and density, or swap them on a pendulum of fixed length and release angle to see whether the period changes. As mechanics lab equipment for Applied Mechanics and properties-of-matter work, the set includes a lead bob that should be handled with gloves under adult supervision and kept away from food.
Frequently Asked Questions
Q1. Are all six bobs the same mass? No. They are made from different metals, so their masses differ; weigh and record each one for the chosen diameter.
Q2. What precautions apply to the lead bob? Use it only under trained adult supervision, wear suitable gloves, avoid scratching its surface, keep it away from food and wash hands after handling.
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