Q1
What does Archimedes' Principle state?
AUpthrust equals weight of displaced fluid
BUpthrust equals the object's weight always
CUpthrust has no relationship to fluid
DObjects always sink regardless of upthrust
ICSEClass 9 (ICSE)PhysicsCh 5 · Topic 1
Upthrust in Fluids, Archimedes' Principle and Floatation
Upthrust is the upward force fluids exert on submerged objects, explained by Archimedes' Principle, determining whether objects float or sin
Core concept
Archimedes' Principle states that the upthrust on a submerged object equals the weight of fluid displaced by that object.
How it works
An object floats if its weight is less than or equal to the maximum upthrust (weight of fluid it can displace), and sinks if weight exceeds this.
Why it matters
The concept of density helps explain floatation - objects less dense than the fluid float, while denser objects sink.
Key detail
Understanding upthrust and floatation explains why ships (despite being heavy) float, and helps design vessels and swimming aids.
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Quick notes
• Archimedes' Principle: upthrust equals weight of displaced fluid.
• Objects float if weight ≤ maximum upthrust.
• Objects sink if weight exceeds upthrust.
• Density determines floatation.
• Less dense objects than the fluid float.
• Denser objects sink.
• This explains why heavy ships float.
• It helps design vessels and swimming aids.