Parallelogram Law Apparatus | Gravesande
Product Code : SCL-PLE-11752
Quick Answer: The Parallelogram Law Apparatus | Gravesande is a vertical force board with two ball-bearing pulleys and three sets of slotted weights with hangers, used to demonstrate the parallelogram law of forces for three concurrent forces in equilibrium.
Last updated: 18 October 2026
Key Features
- Two low-friction ball-bearing pulleys on adjustable clamps.
- Three sets of slotted weights, each with a hanger.
- Mirror strip and thread line for parallax-free tracing of force lines.
- Iron base with levelling screws.
Technical Specifications
| Specification | Value |
|---|---|
| Pulleys | Two, low-friction ball-bearing |
| Pulley mounting | Adjustable clamps for different angles |
| Weights | 3 sets of slotted weights with hangers |
| Tracing aid | Mirror strip and thread line |
| Base | Iron, with levelling screws |
| Principle | Vector addition of concurrent forces |
How It Is Used
Three threads are knotted together: two pass over the pulleys to hangers and the third hangs straight down. When the knot is at rest, the thread directions are traced onto paper on the board using the mirror strip, and two forces are drawn to scale as sides of a parallelogram. Its diagonal should match the third force in size and lie opposite to it.
Frequently Asked Questions
How many weight sets come with the Parallelogram Law Apparatus | Gravesande?
Three sets of slotted weights, each with its own hanger, one for each of the three forces.
How are the force directions marked on the Parallelogram Law Apparatus | Gravesande?
A mirror strip and thread line let each thread be traced without parallax onto paper fixed to the board.
Related Physics Lab Equipment
See the full physics lab equipment range, or these related statics and force apparatus:
- Force Board,wall type 750x600mm
- Moment of Force Apparatus
- Pulley, Bench mounting, ball bearing, nylon
- Slotted Weight 2.5Kg
- Inclined Plane Apparatus
JLab India accepts export orders for the Parallelogram Law Apparatus | Gravesande from Jordan, Malaysia, Democratic Republic of the Congo, Liberia and Yemen.
For a quotation on the Parallelogram Law Apparatus | Gravesande, contact JLab India on +91-8569909696.
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