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Upthrust in Fluids and Archimedes Principle and Floatation

ICSE · Class 9 · Physics

Quick revision notes for Upthrust in Fluids and Archimedes Principle and Floatation — ICSE Class 9 Physics. Key concepts, formulas, and definitions for last-minute revision.

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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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Key Topics to Revise

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.

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Full Notes

Key Concepts

The upward force exerted onBuoyancy is the property ofWhen a body is immersed partiallyDensity is the mass per unitRelative density is the ratio

Frequently Asked Questions

What are the important topics in Upthrust in Fluids and Archimedes Principle and Floatation for ICSE Class 9 Physics?
Upthrust in Fluids and Archimedes Principle and Floatation covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Upthrust in Fluids and Archimedes Principle and Floatation — ICSE Class 9 Physics?
Understand the core concepts first, then work through the 42 practice questions available for this chapter. Revise formulas and 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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