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Force and Laws of Motion Cheat Sheet (DRAFT) by

This is a cheat sheet for class 9, chapter force and laws of motion.

This is a draft cheat sheet. It is a work in progress and is not finished yet.
 

Archimedes principle

When a body is fully or partially immerged in a fluid, it experi­ences a weight loss which equals to the buoyant force (upward force/­upt­hrust) which is equal to the weight of fluid displaced by it.

Applic­ation of Archimedes principle

1) Used in designing ships and submar­ines.
2) In Lactom­eters to find the purity of milk.
3) In Hydrom­eters to determine the density of liquids.
 

Concept of float and sink

FLOAT:
realtive density
upthrust > weight of object
dfluid > dobject

SINK:
upthrust < weight of object
dfluid < dobject
density of substance is the mass per unit volume.