Moments Disc Apparatus
Product Code : EL-AM-10332
Quick answer: The Moments Disc Apparatus is a machine-turned, well-balanced aluminium disc turning on ball bearings, clamped on a tripod stand in a vertical plane. Pins with scale pans fit into holes anywhere on the disc, and a horizontal graduated mirror glass scale with plumb line measures the lever arms. It is used to verify the principle of moments. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Component | Specification |
|---|---|
| Disc | Aluminium, machine turned, well balanced |
| Bearing | Rotates about its axis on ball bearings |
| Mounting | Clamped on a tripod stand in a vertical plane |
| Holes | Several, for two pins carrying scale pans at any position |
| Supplied with | Horizontal graduated mirror glass scale, plumb line |
How the principle of moments is verified
The moment of a force about an axis is the force multiplied by the perpendicular distance from the axis to its line of action. On the disc, each scale pan hangs vertically from its pin, so the lever arm is the horizontal distance between the axis and the vertical line through the pin, not the distance measured along the disc. The disc comes to rest when the sum of the clockwise moments equals the sum of the anticlockwise moments.
- Clamp the disc on the tripod stand in a vertical plane and check that it turns freely when unloaded.
- Insert the two pins in chosen holes and hang the scale pans with known loads.
- Let the disc turn freely and come to rest.
- Hang the plumb line through each pin and read its horizontal distance from the axis on the mirror glass scale, lining up the thread with its image to avoid parallax.
- Compare W1 x d1 with W2 x d2, and repeat with other holes and loads.
Key features
- Machine-turned aluminium disc, well balanced about its axis
- Ball-bearing mounting for free rotation in a vertical plane
- Several holes let the two pins and scale pans be placed at any position
- Horizontal graduated mirror glass scale for parallax-free readings
- Plumb line for locating the vertical line of action of each load
- Clamps on a tripod stand
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the moments disc apparatus 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
- Fletcher Trolley (EL-AM-10331)
- Universal Force Table (EL-AM-10333)
- Parallelogram Force Apparatus (EL-AM-10330)
- Wheel and Axle, on Stand (EL-AM-10334)
- Inclined Plane Economy (EL-AM-10329)
- Maxwell Wheel (EL-AM-10335)
The full range is in the Applied Mechanics section of the Physics Lab range.
Frequently asked questions
What does the Moments Disc Apparatus demonstrate?
The principle of moments: at equilibrium the clockwise and anticlockwise moments of the loads about the axis are equal.
Why does the moments disc have a mirror scale and plumb line?
The plumb line marks the vertical line of action through each pin, and the horizontal mirror glass scale measures its distance from the axis without parallax.
How is the moments disc mounted?
On ball bearings, clamped on a tripod stand so that the disc turns in a vertical plane.
What is the price of the moments disc apparatus?
Prices are not published on the website. Add the moments disc apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-AM-10332 and the quantity, to receive a quotation.
Does Lab Exports manufacture the moments disc apparatus?
Yes. Lab Exports manufactures the moments disc apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-AM-10332.
Request a quote
Email [email protected] with the house code EL-AM-10332 and the quantity, or add the moments disc apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
