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CAIE A-Level Physics 4.2.3 Vector Triangles for Three Forces

Practise representing three coplanar equilibrium forces with a closed vector triangle, finding unknowns and checking scale, orientation and physical meaning.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Represent coplanar forces in equilibrium with a vector triangle.
  • Construct or interpret the triangle to determine an unknown force, direction or resultant.
  • Check closure, scale, orientation and the physical equilibrium interpretation.

4.2.3—A vector triangle to represent coplanar forces in equilibrium question 1

[Maximum number: 1]

An object is held in equilibrium by three forces. The forces all act in the same plane. The diagram

shows two of the forces that act on the object.

The third force is missing from the diagram.

What is the third force?

A

Option A shown in diagram

B

Option B shown in diagram

C

Option C shown in diagram

D

Option D shown in diagram

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