Bifilar Pendulum

Product Code : LSK-AM-11098

Bifilar Pendulum (SKU LSK-AM-11098) hangs a heavy cast iron plate on two strings of equal length, so that it twists about a vertical axis midway between them. Timing these oscillations lets students find the moment of inertia and radius of gyration of the plate in B.Sc. physics, engineering physics and diploma mechanics labs. The apparatus is a Science Lab Supplies product, made at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, and offered by the factory to schools, colleges, contractors and distributors.

Specifications

The rigid support is a heavy T-shaped clamp with two split chucks, mounted on a heavy base, from which the plate hangs by two equal strings. The plate is cast iron, 15 x 10 x 1.5 cm, with six holes: two on the top face, two on the front and two on a third side.

Applications and Experiments for the Bifilar Pendulum

The bifilar suspension is used to determine the moment of inertia of the rectangular plate from its period of torsional oscillation, string length and string separation. With holes on three faces, the plate can be hung in different orientations, so students can compare moments of inertia about different axes in one practical session.

• B.Sc. physics: moment of inertia and radius of gyration of a plate by bifilar suspension.
• Studying how the period changes with string length and separation.
• Engineering mechanics: checking the calculated moment of inertia of a rectangular body.

Standard Scope of Supply

The Bifilar Pendulum is supplied with the 15 x 10 x 1.5 cm cast iron plate carrying its six holes and the heavy T-shaped clamp with two split chucks on its heavy base. Any additional items your practical needs can be listed on the quotation.

Packing, MOQ and Lead Time

Pricing can be requested for one pendulum or for a number of sets to equip every group in a mechanics lab. Your quotation will state packing, delivery time and price for that quantity, and other physics lab equipment in India from this range can be added in the same request.

Operating with an Importer-Exporter Code, Science Lab Supplies can ship to buyers in Nepal, Bangladesh, Zambia, Rwanda, South Africa and Qatar. Get in touch on the contact page, shortlist items in the enquiry cart, or consult the lab tender page for institutional tenders.

Frequently Asked Questions

What does a bifilar pendulum measure?
It measures the moment of inertia of a body, here a cast iron plate, about a vertical axis. The plate is twisted slightly and released, and its period, together with the string length and separation, gives the moment of inertia.

Why does the plate have six holes?
There are two holes on each of three faces. This lets the plate be suspended with different faces uppermost, so moments of inertia about different axes of the same plate can be measured and compared.

What size is the plate?
The plate is heavy cast iron, rectangular, measuring 15 x 10 x 1.5 cm. When it hangs freely, the two strings are equally inclined to its horizontal face.

Who is the manufacturer of this pendulum?
Science Lab Supplies is. Both the plate and the T-shaped support are produced at the company's plant in Saha, Ambala, India, so orders and technical queries are handled by the maker itself.

Related Moment of Inertia Apparatus

The four items below cover the same moment of inertia and oscillation topics as the bifilar pendulum. They use different bodies and methods, which helps students compare results and understand rotational dynamics more fully, and any of them can be added to the quotation for this set.

• Inertia Table — moment of inertia of an irregular body.
• Fly Wheel — balanced cast iron wheel on ball bearings.
• Kater's Reversible Pendulum — compound pendulum with two knife edges.
• Torsion Pendulum — brass disc and ring on a suspension wire.

Browse the full Applied Mechanics range or all physics lab equipment.

Last updated: 25 September 2026