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Upthrust in Fluids, Archimedes' Principle and Floatation — PHYSICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9PHYSICSUpthrust in Fluids, Archimedes' Principle and Floatation2 Marks
Question
Why is a force needed to keep a block of wood inside water?
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Answer

Upthrust due to water on block when fully submerged is more than its weight. Density of water is more than the density of cork; hence, upthrust due to water on the block of cork when fully submerged in water is more than its weight.

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