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Upthrust in Fluids and Archimedes Principle and Floatation — Syllabus

ICSE · Class 9 · Physics

What Upthrust in Fluids and Archimedes Principle and Floatation covers in ICSE Class 9 Physics: 4 topics, for the 2026-27 session.

42 questions32 flashcards15 formulas & key relations5 concepts

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A diagram illustrating a body partially or wholly immersed in a fluid, showing the upward buoyant force (upthrust) acting on it, opposing its weight. Include an empty can being pushed into water as an
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4 Topics · ICSE Class 9 Physics · 2026-27

Topics in Upthrust in Fluids and Archimedes Principle and Floatation

1

Upthrust, Buoyancy, and Their Nature

  • Upthrust is the upward force exerted by the fluid on a body immersed in it.
  • Buoyancy is the property of a liquid to exert an upward force on a body immersed in it.
  • When a body is partly or wholly immersed in a liquid, two main forces act on it: weight downward and upthrust upward.
2

Archimedes' Principle and Its Verification

  • Archimedes' principle states that when a body is immersed partially or completely in a liquid, it experiences an upthrust equal to the weight of the liquid displaced by it.
  • This principle applies to liquids and gases.
  • The apparent loss in weight of a body in a fluid is equal to the upthrust on the body.
3

Floatation and Conditions for Floating or Sinking

  • A body sinks if the maximum upthrust when fully immersed is less than its weight.
  • A body floats if the maximum upthrust is equal to or greater than its weight.
  • If maximum upthrust equals weight, the body floats fully submerged with apparent weight zero.
4

Density and Relative Density

  • Density is mass per unit volume.
  • Density is represented by ρ or d.
  • SI unit of density is kg m^-3 and CGS unit is g cm^-3.

Key Concepts

Central concept: Upthrust and floatation in fluids

Upthrust or Buoyant ForceBuoyancyArchimedes' PrincipleFloatationDensityRelative DensityCentre of BuoyancyCentre of Gravity

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Frequently Asked Questions

What are the important topics in Upthrust in Fluids and Archimedes Principle and Floatation for ICSE Class 9 Physics?
Key topics in Upthrust in Fluids and Archimedes Principle and Floatation include Upthrust, Buoyancy, and Their Nature, Archimedes' Principle and Its Verification, Floatation and Conditions for Floating or Sinking, Density and Relative Density. Study these first, then practise questions on each for Class 9 exams.
How should I revise Upthrust in Fluids and Archimedes Principle and Floatation for Class 9 exams?
Learn the core ideas first, then work through the 42 practice questions on Upthrust in Fluids and Archimedes Principle and Floatation. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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