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FORCES IN FLUIDS

SCERT CLASS IX PHYSICS PART 1 CHAPTER 1

TermDefinition
BUOYANCY When a body is immersed completely or partially in a fluid, the fluid exerts an upward force on the body.
ARCHIMEDES PRINCIPLE When an object is immersed partially or completely in a fluid, the buoyancy experienced by it will be equal to the weight of the fluid displaced by it.
PRINCIPLE OF FLOATATION Weight of a floating body is equal to the weight of the fluid displaced by it.
RELATIVE DENSITY Ratio of the density of the substance to the density of water.
HYDROMETER Device used to measure the relative density of a liquid.
PASCAL'S LAW The pressure applied at any point of a liquid at rest in a closed system will be experienced equally at all parts of the liquid.
BASIS OF PASCAL'S LAW Volume of liquid cannot be changed using pressure.
DEVICES CONSTRUCTED ON THE BASIS OF PASCAL'S LAW Hydraulic brake of vehicles, Hydraulic jack and Hydraulic press
CAPILLARITY The rise or depression of a liquid in a narrow tube or a minute hole.
COHESIVE FORCE The attraction between the molecules of the same type.
ADHESIVE FORCE The force of attraction between molecules of different types of substances.
CAPILLARY RISE OCCURS When the adhesive force is greater than the cohesive force.
CAPILLARY DEPRESSION OCCURS When the cohesive force is greater than the adhesive force.
VISCOUS FORCE Between the layers of a liquid in motion, there is a frictional force parallel to the layers which try to prevent the relative motion between the layers.
VISCOSITY Characteristic property of a liquid to oppose the relative motion between its different layers.
Created by: Aneena
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