Inertia Disc
Product Code : EL-AM-10315
Quick answer: The Inertia Disc is a brass disc of about 15 cm diameter and 6 mm thickness with an arrangement for clamping a split chuck. Hung from a wire, it forms a torsion pendulum for moment of inertia experiments and for finding the rigidity modulus of the wire. It is supplied without a wall bracket. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Item | Specification |
|---|---|
| Material | Brass |
| Diameter | Approx. 15 cm |
| Thickness | 6 mm |
| Chuck | Split chuck clamping arrangement |
| Wall bracket | Not included |
How it is used
A uniform disc of mass M and radius R has a moment of inertia I = MR^2/2 about its central axis, so the brass disc gives a body whose moment of inertia is calculated from its measured mass and diameter. Clamped to a wire through the split chuck and hung from a rigid support, it becomes a torsion pendulum with period T = 2 pi sqrt(I/C).
From the period and the calculated I, the torsional constant C of the wire is found, and with the length l and radius r of the wire the modulus of rigidity follows from eta = 8 pi I l / (r^4 T^2).
- Weigh the disc and measure its diameter to calculate I = MR^2/2.
- Clamp the wire in the split chuck at the centre of the disc and fix the upper end to a rigid support or wall bracket.
- Twist the disc through a small angle and time 20 torsional oscillations.
- Measure the length of the wire and its radius with a screw gauge, then calculate the rigidity modulus.
Key features
- Solid brass disc for steady, repeatable torsional oscillations
- Approx. 15 cm diameter and 6 mm thickness, so I is calculated directly from the measured mass and radius
- Split chuck clamping arrangement to grip the suspension wire at the centre
- Suited to moment of inertia and torsion pendulum experiments
- Supplied without a wall bracket; a rigid support is needed for the upper end of the wire
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Inertia Disc at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Applied Mechanics products
- Inertia Table (EL-AM-10314)
- Fly Wheel (EL-AM-10316)
- Maxwell Vibration Needle (EL-AM-10313)
- Torsion Pendulum (EL-AM-10317)
- Lever/Force into Force Arm Apparatus (EL-AM-10312)
- Torsion Pendulum (Bridge Type) (EL-AM-10318)
The full range is in the Applied Mechanics section of the Physics Lab range.
Frequently asked questions
What is the Inertia Disc made of?
Brass. The disc is approximately 15 cm in diameter and 6 mm thick.
Is a wall bracket included with the inertia disc?
No. The disc is supplied with its split chuck clamping arrangement but without a wall bracket.
What experiments is the inertia disc used for?
Moment of inertia and torsion pendulum experiments, including finding the modulus of rigidity of the suspension wire.
What is the price of the Inertia Disc?
Prices are not published on the website. Add the Inertia Disc to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-AM-10315 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Inertia Disc?
Yes. Lab Exports manufactures the Inertia Disc at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-AM-10315.
Request a quote
Email [email protected] with the house code EL-AM-10315 and the quantity, or add the Inertia Disc to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
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