Is Mechanical Properties of Solids and Fluids So Important For NEET?


Class 11 Physics Chapter 10 Mechanical Properties of Fluids is part of Unit 7, which is Properties of Bulk Matter, according to the current CBSE syllabus. This unit will consist of 20 questions worth a total of 20 points. Mechanical Properties of Fluids review notes on Doubtnut will help you understand all of the essential ideas and theories presented in this chapter. According to the curriculum for the forthcoming CBSE Class 11 test, our subject matter experts have highlighted the major subjects of Chapter – 10 Mechanical Properties of Fluids below. Fluids, such as liquids and gases, are substances that can flow. It doesn’t have a defined form. The fluid typically exerts a force on an object’s surface when it is submerged in a liquid at rest. The liquid push is what it’s called. Pressure is the push experienced per unit area of a liquid’s surface while it is at rest.

Fluids Mechanics

The term “fluids” is used to describe both liquids and gases. To put it another way, fluids are substances that have the ability to flow. The assumption is that fluids are incompressible (i.e., the density of liquid is not dependent on the variation in pressure and remains constant). Non-viscous fluids are also assumed (i.e., the two liquid surfaces in contact are not pressing any tangential force on each other).

Atmospheric Pressure

Atmospheric pressure is the force exerted by the earth’s atmosphere. At sea level, the normal atmospheric pressure is 1 atmosphere (atm), which is equivalent to 1.013 105Pa. Gauge pressure is the pressure that is higher than atmospheric pressure, whereas absolute pressure is the entire pressure. A barometer is a device that measures atmospheric pressure, whereas a U–tube manometer, often known as a manometer, is a device that measures gauge pressure.

Pascal’s Law

When applied to an enclosed fluid, a pressure change is transferred unequally to all parts of the fluid as well as the enclosing vessel’s walls. The hydraulic lift is a prominent application of Pascal’s law, which has numerous practical uses.

Archimedes Principle

Consider a body that has been half or completely submerged in a liquid. This body is subjected to a contact force from the fluid. The sum of these contact forces is referred to as buoyant force or upthrust. F is the weight of the fluid that the body has displaced. This force is known as buoyant force, and it operates vertically upwards (opposite to the body’s weight) through the displaced fluid’s centre of gravity. The weight of fluids expelled by the body = upthrust= perceived reduction in body weight. When the average density of a body is smaller than the average density of the liquid, it is said to float. The weight of the liquid displaced by the submerged section of the body should be equal to the body’s weight. The body’s centre of gravity and buoyancy centre should be on the same vertical line.

Fluid Dynamics

Fluid Dynamics is a term that refers to the steady Flow (Streamline Flow): A flow in which the velocity of fluid particles crossing a certain point remains constant at all times. Clearly, each particle takes the same route through that location as the preceding particle. Flow of information: The route taken by a particle in a moving liquid is known as the line of flow. It’s called a streamline when it comes to a constant flow. It is never claimed that two streamlines will intersect.

Bernoulli’s Theorem

The total of pressure energy per unit volume, potential energy per unit volume, and kinetic energy per unit volume is always constant for all cross-sections of a perfect fluid in a streamlined flow. Bernoulli’s equation is only valid for an incompressible steady flow of a viscous fluid. Velocity of efflux is an application of Bernoulli’s Theorem.


The property of a fluid that resists relative motion between its distinct layers is known as viscosity, and the force that comes into play is known as the viscous force.

Stoke’s Law

Stoke’s Law is a law that states that when a solid moves through a viscous medium, a viscous force opposes its motion, which is determined by the body’s velocity, shape, and size. The importance of Stoke’s law, With the aid of Millikan’s experiment, this law is used to determine the electronic charge. The production of clouds is the subject of this rule. This rule explains why raindrops travel slower than an item falling freely at a constant velocity from the height of the clouds. This legislation permits a person to use a parachute to fly down.

Reynold Number

The preservation of laminar flow stability is aided by viscous forces, according to the Reynold Number. When the rate of flow is high, however, laminar or constant flow is disturbed. At large flow rates, turbulence and irregular, unstable motion develop. Reynold’s number is a dimensionless number whose value gives an estimate of the flow rate, as well as whether it will be turbulent or not. Important question to practise: Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30^@ with each other. When suspended in a liquid of density 0.8gcm^-3, the angle remains the same. If density of the material of the sphere is 1.6gcm^-3, the dielectric constant of the liquid is

Also check

Related Articles

Leave a Reply

Your email address will not be published.

Back to top button