Lever/Force into Force Arm Apparatus

Product Code : EL-AM-10312

Specifications

How the principle of moments experiment is done

A lever balances when the moments about its pivot are equal: the load multiplied by its distance from the fulcrum equals the effort multiplied by its distance, or F1 x d1 = F2 x d2. With the pivot at the centre of the scale, each distance is read directly on its own side of zero.

1. Place the strip on the knife edge and check that it rests level without load.
2. Hang a known slotted weight from one hook and set it at a chosen distance on the scale.
3. Hang a second weight from the other hook and slide it until the strip balances again.
4. Read both distances from the 25-0-25 cm scale and record the weights.
5. Repeat with other weights and positions, and compare F1 x d1 with F2 x d2 each time.

Within reading error the two products agree, which verifies the principle of moments. Plotting force against 1/distance for a fixed moment gives a straight line, showing that the force needed falls as the force arm grows.

Key features

• Stone agate knife edge at the centre keeps friction at the pivot low
• Half-metre aluminium strip is light and rigid
• Screen-printed 25-0-25 cm scale with zero at the centre gives direct arm readings on both sides
• Two plastic hooks slide along the scale to vary the force arm
• Supplied on a sheet metal stand; slotted weights are ordered separately

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 lever 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

• Maxwell Vibration Needle (EL-AM-10313)
• Inertia Table (EL-AM-10314)
• Inertia Disc (EL-AM-10315)
• Fly Wheel (EL-AM-10316)
• Torsion Pendulum (EL-AM-10317)
• 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 does the lever apparatus demonstrate?

It demonstrates the principle of moments: at balance, force x force arm on one side of the pivot equals force x force arm on the other.

What is the scale range of the lever apparatus?

The screen-printed scale reads 25-0-25 cm with zero at the centre, directly above the knife edge.

Are weights included with the lever apparatus?

No. The apparatus is supplied on its sheet metal stand without weights; slotted weights are needed for the hooks.

What is the price of the lever apparatus?

Prices are not published on the website. Add the lever apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-AM-10312 and the quantity, to receive a quotation.

Does Lab Exports manufacture the lever apparatus?

Yes. Lab Exports manufactures the lever apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-AM-10312.

Request a quote

Email [email protected] with the house code EL-AM-10312 and the quantity, or add the lever apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.