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.
Key Topics to Revise
Buoyancy and Upthrust
- Upthrust (FB) is the upward force exerted by a fluid on a body immersed in it
- Buoyancy is the property of fluids to exert upward force on immersed bodies
- Upthrust increases as more volume of the body is submerged
Archimedes' Principle
- When a body is immersed in a fluid, it experiences upthrust equal to weight of fluid displaced
- Applies to both liquids and gases
- Loss in weight of body = upthrust = weight of displaced fluid
Relative Density and its Measurement
- Relative Density (R.D.) = Density of substance / Density of water at 4°C
- R.D. is unitless (pure ratio)
- For C.G.S. system: R.D. = numerical value of density in g cm⁻³
Principle of Floatation
- Principle: Weight of floating body = Weight of liquid displaced by submerged part
- For floating body, apparent weight = 0
- Volume fraction submerged: v/V = ρs/ρL
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