Floating bodies
Kerala Board · Class 9 · Science
Quick revision notes for Floating bodies — Kerala Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Density and Relative Density
- Density is mass per unit volume, measured in g/cm³ or kg/m³
- Objects with density greater than water (1 g/cm³) tend to sink, while those with lower density tend to float
- Relative density compares an object's density to water's density - it has no units
Pressure in Fluids
- Atmospheric pressure = 1.01 × 10⁵ N/m² = 1 atmosphere = 76 cm of Hg
- Pressure in liquids increases with depth due to weight of liquid column above
- Pressure at depth h in liquid: P = P₀ + hρg
Buoyancy and Archimedes' Principle
- Buoyant force acts upward on any object immersed in fluid
- Archimedes' Principle: Buoyant force equals weight of fluid displaced
- For floating objects: Weight of object = Weight of displaced fluid
Conditions for Floating and Sinking
- Object floats if: Density of object < Density of fluid
- Object sinks if: Density of object > Density of fluid
- Object neutrally buoyant if: Density of object = Density of fluid
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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