Physics Practicals Class 11

Parallelogram Law of Vector Addition

  • Teach science experiments in a gamified way
  • Boost conceptual clarity and knowledge retention
  • Aligned with National Education Policy 2020
  • Helpful in getting NAAC accreditation
  • CBSE, ICSE, and state boards aligned curricula
  • Engaging simulations with easy-to-teach instructions

About Simulation

  • Through the simulation, you will gain a comprehensive understanding of how to determine the mass of an object by utilizing the parallelogram law of vector addition.
  • By engaging with the simulation, you can acquire the skills needed to measure the mass of an object by tracing a parallelogram using a geometric compass and marking equilibrium through the balancing of weights on hangers.
  • At the conclusion of the simulation, you will learn the functioning of Grave Sand's apparatus.
  • You will also grasp the principles behind the parallelogram law of vector addition.

Physics Practical Class

  • Additionally, you will develop the ability to determine the mass of an object, trace a parallelogram using a geometric compass, and calculate the resultant of two forces.

Simulation Details

Duration – 30 Minutes
Easily Accessible
Languages – Odia & English
Platforms – Android & Windows


Grave Sand’s apparatus:
It consists of a wooden board fixed vertically on two wooden pillars. Two pulleys P1 and P2 are provided on its two sides near the upper edge of the board. A thread carrying hangers for addition of slotted weights is made to pass over the pulleys so that two forces P and Q can be applied by adding weights to the hangers. By suspending the given object, whose weight is to be determined, in the middle of the thread, a third force X is applied.

Physics Practical Class

Parallelogram law of vector addition:
The law states that “when two forces act simultaneously at a point and are represented in magnitude and direction by the two adjacent sides of a parallelogram, then the resultant of forces can be represented both in magnitude and direction by the diagonal of the parallelogram passing through the point of application of the two forces.”

Let P and Q be the magnitudes of the two forces and θ the angle between them. Then the resultant R of P and Q is given by,

Physics Practical Class

Requirements for this Science Experiment

  • Grave Sand’s apparatus
  • White paper
  • Drawing pins
  • Pencil, string
  • Wooden block
  • Protractor
  • Weight hanger
  • Slotted weight
  • Scale
  • Thin mirror strip
  • Geometry compass

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