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What is a required condition for a set of forces to be in equilibrium?

Strength of Materials MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Strength of Materialscivil-engineering-mcqs › strength-of-materials
Published
15 Jan 2019
Last updated
28 May 2026

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Explanation

For forces to be in equilibrium, they must be coplanar, meaning they all lie within the same plane. This is a fundamental requirement to ensure that their resultant can be zero.

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Practice related questions from the same subject.

  1. 1.In a third-class lever, how are the positions of the load (W), effort (P), and fulcrum (F) arranged?
  2. 2.What is the standard SI unit used to measure work or energy?
  3. 3.Identify the option that is not a unit used to measure pressure.
  4. 4.What is the term for forces that intersect at a single point but whose lines of action are not confined to the same plane?
  5. 5.Identify the quantity below that is not classified as a scalar.
  6. 6.Two forces act at different angles and produce different resultant magnitudes: when perpendicular, their resultant is √10 kg, and when the angle between them is 60°, the resultant measures √13 kg. What are the magnitudes of these two forces?
  7. 7.What is formed when two equal, parallel forces act in opposite directions but are not along the same line?
  8. 8.What does the law of the triangle of forces state?
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