Question

class 11 phy
mechanical properties of fluids...
notes pls!!​

Answer 1

Answer:

okk

• fluids are the sustances which can flow e.g., liquids and gases. It does not possess definite shape.

• When an object is submerged in a liquid at rest, the fluid exerts a force on its surface normally. It is called thrust of the liquid.

• Pressure

The thrust experienced per unit area of the surface of a liquid at rest is called pressure.



• When a liquid is in equilibrium, the force acting on its surface is perpendicular everywhere. The pressure is the same at the same horizontal level.

• The pressure at any point in the liquid depends on the depth (h) below the surface, density of liquid and acceleration due to gravity.

• Pascal’s Law

According to Pascal’s Law, the pressure applied to an enclosed liquid is transmitted undiminished to every portion of the liquid and the walls of the containing vessel.

• Hydraulic system works on Pascal’s law. Force exerted to area, ratio will be same at all cross¬sections.



Note: A large force is experienced in larger cross-section it a smaller force 4cross is applied in smaller by the relation section.

• A column of height h of a liquid of density p exerts a pressure P given



• If Pa be the atmospheric pressure then pressure in a liquid at a depth h from its free surface is given by P = Pa+ hρg. Relation is true for incompressible fluids only.

• The gauge pressure (Pg), is the difference of the absolute pressure (P) and the atmospheric pressure (Pa).

Absolute pressure (P) = Gauge pressure (Pg) + Atmospheric pressure (Pa)

Pg=P-Pa

• Archimedes Principle

When a body is partially or completely immersed in a liquid, it loses some of its weight. The loss

in weight of the body in the liquid is equal to the weight of the liquid displaced by the immersed

part of the body.

•

Answer 2

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