  # Mechanics  [ 11 Topics ]

1. #### Physical Quantities and Their Measurement 8 Videos

The analysis of physical phenomena and processes requires the measurement of physical quantities. A physical quantity is measured in terms of a small part of it. The small part is conventionally adopted as a unit of measurement of the quantity. We can choose such a unit for every quantity independent of other quantities. However, it is helpful to first establish the units of a few quantities which are called base or fundamental quantities. The corresponding units are called base or fundamental units. The units of the remaining physical quantities are expressed in terms of these base units. These quantities are called derived quantities and their units, derived units. To firm up your basic knowledge we have videos on Base and Derived Quantities and Their Units, Principle of Homogeneity of Dimensions, Order of Magnitude Calculation, Uses of Dimensional Analysis etc.

Base And Derived Quantities And Their Units 29:07 Basic
Base And Derived Quantities And Their Units II 34:45 Basic
Base And Derived Quantities And Their Units III 1:03:09 Basic
Dimensions And Principle Of Homogeneity 39:12 Basic
Order Of Magnitude Calculation 41:32 Basic
Problems On Dimensional Analysis 35:21 Basic
Problems On Dimensional Analysis II 54:47 Basic
Uses Of Dimensional Analysis 57:16 Basic
2. #### Vectors 16 Videos

A quantity which is completely specified by a number with an appropriate unit is called a scalar. A scalar has only magnitude but no direction. Some scalars like volume and mass are always positive. Other scalars like temperature and electric charge can be either positive or negative. A quantity which is completely specified by a number with an appropriate unit and direction is called a vector. Thus, a vector has both magnitude and direction. Examples of vectors are velocity, acceleration, force, momentum, torque etc. We have video lectures on Addition of Vectors, Subtraction of Vectors, Resolution of Vectors, Product of Vectors and other aspects of vector with suitable examples and problems.

Addition Of Vectors By Resolution 1:06:46 Basic
Examples Of Vector Addition And Subtraction 49:20 Basic
Problems On Scalar Product Of Vectors 35:34 Basic
Problems On Scalar Product Of Vectors II 36:21 Basic
Problems On Vector Product Of Vectors 43:01 Basic
Resolution of a position vector in space 1:20:27 Basic
Resolution Of Vector 57:58 Basic
Scalar Product Of Two Vectors 1:22:27 Basic
Some Important Definitions On Vector 1:00:04 Basic
Subtraction Of Vectors 38:49 Basic
Vector Product Of Two Vectors 1:33:10 Basic
Concept Of Vector 1:02:58 Basic
3. #### Motion In One and Two Dimensions 24 Videos

Mechanics can be divided into two parts: dynamics and statics. Dynamics is the study of motion of a body under one or more forces. Statics is the study of the condition of rest of a body under a number of forces. Dynamics is further divided into kinematics and kinetics. Kinematics is that part of dynamics which deals with motion without reference to the forces that cause it or the properties of the body in motion. Kinetics is that part which relates the motion of a body to its mass and the casual force(s). The subtopics covered in the present topic such as Projectile Motion, Translational Motion, Graphical Analysis of Rectilinear Motion, Rectilinear Motion with Constant Acceleration, Rectilinear Motion under Gravity etc. fall within the scope of kinematics.

Advanced-Level Problems On Motion In One And Two Dimensions I 1:05:48 Advance
Advanced-Level Problems On Motion In One And Two Dimensions II 1:05:03 Advance
Advanced-Level Problems On Motion In One And Two Dimensions III 1:11:12 Advance
Advanced-Level Problems On Motion In One And Two Dimensions IV 1:01:05 Advance
Advanced-Level Problems On Motion In One And Two Dimensions VI 1:08:18 Advance
Analysis Of Rectilinear Motion By Calculus 30:46 Basic
Graphical Analysis Of Rectilinear Motion 57:17 Basic
Kinematic Equation By Integration 28:46 Basic
Kinematic Equations By Graphical Method 23:29 Basic
Motion Of A Boat In A River 58:10 Basic
Problems On Motion In One And Two Dimensions (CE) 1:21:28 Advance
Problems On Motion In One And Two Dimensions II (CE) 1:14:11 Advance
Problems On Motion In One And Two Dimensions III (CE) 1:09:09 Advance
Problems On Motion In One And Two Dimensions IV (CE) 1:12:24 Advance
Problems On Kinematic Equations 1:02:21 Basic
Problems On Rectilinear Motion Under Gravity 27:35 Basic
Problems On Relative Velocity And Relative Acceleration 1:53:39 Basic
Projectile Motion 1:02:33 Basic
Rectilinear Motion Under Gravity 50:08 Basic
Rectilinear Motion With Constant Acceleration 31:45 Basic
Relative Velocity And Relative Acceleration 38:57 Basic
Rest And Motion 56:19 Basic
Some Terms Associated With Translational Motion 1:18:15 Basic
Advanced-Level Problems On Motion In One And Two Dimensions V 1:07:34 Advance
4. #### Newton's Laws of Motion 26 Videos

Newton’s three laws of motion are fundamental to the study of Kinetics. Kinetics is the study of how motion of a body is related to its mass and the force(s) acting on it. The force represents the interaction of a body with its environment. In general, the environment consists of nearby bodies and the effect of distant bodies may be ignored. The mass of a body is a measure of its inertia which is the tendency to resist acceleration under a force. The theory of motion was developed by English physicist Sir Isaac Newton (1642 – 1727) in the 17th century. We have video lectures on various subtopics such as Newton’s Laws of Motion, Concept of Force, Free Body Diagrams, Applications of Newton’s Laws, Pseudo Force, Comparison of Inertial Frame And Non-Inertial Frame etc. to provide an in-depth knowledge in an extremely skillful way.

Problems On Application Of Newtons Laws Part 50:10 Basic
Problems On Application Of Newtons Laws Part II 1:00:17 Basic
Comparison Of Intertial-Frame And Non-Intertial-Frame Methods 46:49 Basic
Concept Of Force 1:12:00 Basic
Constrained Motion Of Pulley-Block System 1:37:07 Basic
Constrained Motion Of Wedge-Block System 37:10 Basic
Free Body Diagram 1:00:37 Basic
Newton's First Law Of Motion I 48:50 Basic
Newton's First Law Of Motion II 30:17 Basic
Newton's Second Law Of Motion 1:15:50 Basic
Newton's Third Law Of Motion And Units Of Force 58:18 Basic
Pseudo Force With Examples 1:08:44 Basic
Problems On Newton's Laws Of Motion (CE) 1:08:48 Advance
Problems On Newton's Laws Of Motion II (CE) 1:23:12 Advance
Problems On Newton's Laws Of Motion III (CE) 1:18:11 Advance
Problems On Newton's Laws Of Motion IV 1:07:35 Advance
Study Of Wedge-Block System By Pseudo-Force Method 44:45 Basic
Application Of Newton's Law 1:02:48 Basic
Applications Of Newton's Laws II 38:17 Basic
Problems On Pulleys And Wedge-block System 36:09 Basic
Problems On Pulleys And Wedge-block System II 54:21 Basic
5. #### Friction 16 Videos

We often simplify problems by assuming that the motion of bodies takes place on “frictionless” surfaces. Strictly speaking, there is no such surface. In real life all motions happening around us are affected by the force of friction. Therefore, a realistic approach to any mechanical problem requires that we identify the frictional forces acting on the system and include them in the respective equations of motion. That is precisely what you will learn to do in the present topic. You will find video lectures on Static and Kinetic friction, Angle of Repose, Angle of Friction, Examples of Motion on Rough Surfaces, Rolling Friction, Drag Force etc. explained and supported by suitable applications and numerical examples.

Angle Of Repose And Angle Of Friction 1:06:42 Basic
Drag Force 50:02 Basic
Examples Of Motion On Rough Surfaces I & II 49:14 Basic
Examples Of Motion On Rough Surfaces III 1:01:19 Basic
Problems On Drag Force 31:27 Basic
Problems On Motion On Rough Surfaces 52:27 Basic
Problems On Motion On Rough Surfaces II 1:09:32 Basic
Problems On Motion On Rough Surfaces III 45:08 Basic
Rolling Friction 1:01:54 Basic
Static And Kinetic Friction 1:02:11 Basic
Examples Of Motion On Rough Surfaces IV 1:11:34 Basic
6. #### Circular Motion 18 Videos

In the present topic, the same motion will be discussed in greater detail. The topic deals with the kinematics of circular motion without any reference to the forces that cause it as well as the contribution of the forces acting on a particle, causing its circular motion. The study of circular motion is not only important in itself, but also an essential precondition for the study of rotational motion. When a rigid body rotates about an axis, every particle of it describes a circle whose centre lies on the axis of rotation. Therefore, the kinematic equations that we develop in this topic will also be useful to study rotational motion. This topic consists of video lectures on Angular Quantities in Circular Motion, Circular Motion with Constant Angular Acceleration, Two Accelerations of Non-Uniform Circular Motion, Problems on Circular Motion and many more to provide a thorough knowledge and to guide students to develop the problem-solving skill.

Angular Quantities In Circular Motion 1:11:16 Basic
Circular Motion With Constant Angular Acceleration 31:51 Basic
Derivation Of Centripetal Acceleration 42:19 Basic
Examples Of Nonuniform Circular Motion 1:04:17 Basic
Examples Of Uniform Circular Motion 42:49 Basic
Examples Of Uniform Circular Motion II 47:42 Basic
Problems On Circular Motion 33:45 Basic
Problems On Circular Motion II 57:52 Basic
Problems On Circular Motion III 34:51 Basic
Problems On Circular Motion With Constant Angular Acceleration 32:47 Basic
Relations Between Linear And Angular Quantities 38:28 Basic
Two Accelerations Of Nonuniform Circular Motion 53:04 Basic
7. #### Work and Energy 26 Videos

Until now we used terms like velocity, acceleration, force etc. which mean more or less the same thing to a physicist and a layman. The term work is an exception. In ordinary conversation the word may mean a wide variety of activities, but in the domain of physics, its use is far more restricted. The concept of energy is closely associated with that of work. Be it a physicist or a common man, everyone has an awareness of energy and what it truly means. We shall mostly be dealing with Mechanical Energy which is further classified into two types: Kinetic Energy and Potential Energy. Through our video lectures on Definition of Work, Work Done by a Varying Force, Concept of Energy and Derivation of Work-Energy theorem, Principle of Conservation of Mechanical energy and Some Applications, Equivalence of Mass and energy, Conservative and Non-Conservative Forces, Potential Energy Function, Principle of Conservation of Mechanical Energy and Some Applications etc. we elaborately illustrated the topic for a crystal clear understanding and application.

Concept Of Energy And Derivation Of Work-Energy Theorem 32:05 Basic
Conservative And Non-Conservative Forces 44:15 Basic
Conservative Force From Potential Energy Function, And Energy Diagrams 53:41 Basic
Definition Of Work 35:15 Basic
Definition Of Work II 1:10:34 Basic
Equivalence Of Mass And Energy 35:40 Basic
More Applications Of Mechanical Energy Conservation Principle 36:17 Basic
Problems On Work And Energy (CE) 1:08:28 Advance
Potential Energy 41:39 Basic
Potential Energy Function 50:42 Basic
Power 44:06 Basic
Principle Of Conservation Of Energy, And Some Applications 1:13:26 Basic
Principle Of Conservation Of Mechanical Energy, And Some Applications 55:25 Basic
Problems On Conservative And Non-Conservative Forces 33:38 Basic
Problems On Kinetic Energy And Work-Energy Theorem 1:01:29 Basic
Problems On Principle Of Mechanical Energy Conservation 58:20 Basic
Problems On Work And Energy (CE) 1:08:28 Advance
Problems On Work And Energy II (CE) 1:03:45 Advance
Work Done By A Varying Force 39:40 Basic
Work Done By Spring Force 39:33 Basic
8. #### Impulse, Collision, and centre of Mass 30 Videos

As the title suggests, this topic can be broadly divided into three sections. In this topic we have defined impulse of a force, the impulse-momentum theorem, the principle of conservation of linear momentum etc. You have already been introduced to the concept of momentum in the topic 4 (Newton’s Laws of Motion). But it needs more than that brief introduction to have a stronger grasp on the topic. The most useful application of the momentum principle is the study of collision between two bodies. The definition of the centre of mass of a system of particle will show the motion of a system of particles is equivalent to the motion of one representative particle located at the centre of mass. You will develop a clear concept of the topic through the video lectures on Impulse and Impulse-Momentum Theorem, Motion of a Body of Variable Mass, Principle of Conservation of Linear Momentum, Collision in One Dimension, Collision in Two Dimensions, Finding Centres of Mass of Uniform Rigid Bodies, Motion of a System of Particles etc.

Advanced-Level Problems On Impulse, Collision, And Centre Of Mass I 1:06:39 Advance
Advanced-Level Problems On Impulse, Collision, And Centre Of Mass II 55:49 Advance
Advanced-Level Problems On Impulse, Collision, And Centre Of Mass III 1:04:40 Advance
Advanced-Level Problems On Impulse, Collosion, And Centre Of Mass V 1:03:21 Advance
Advanced-Level Problems On Impulse, Collision, And Centre Of Mass VI 59:53 Advance
Advanced-Level Problems On Impulse, Collision, And Centre Of Mass VII 1:21:44 Advance
Advanced-Level Problems On Impulse, Collision, And Centre Of Mass VIII 1:20:36 Advance
Advanced-Level Problems On Impulse, Collision, And Centre Of Mass XI 1:26:16 Advance
Centre Of Mass 55:41 Basic
Collision 34:47 Basic
Finding Centres Of Mass Of Rigid Bodies By Integration 48:59 Basic
Finding Centres Of Mass Of Rigid Bodies By Integration II 1:16:27 Basic
Finding Centres Of Mass Of Uniform Rigid Bodies By Inspection 43:07 Basic
Impulse And Impluse-momentum Theroem 47:10 Basic
Mathematical Study Of One Dimensional Collision II 1:05:02 Basic
Mathematical Study Of One Dimensional Collision 1:00:42 Basic
Mathematical Study Of Two-Dimensional Collision 1:07:16 Basic
More Problems On Collision 1:07:53 Basic
Motion Of A Body Of Variable Mass 49:46 Basic
Motion Of A Rocket 31:59 Basic
Motion Of A System Of Particles 1:13:15 Basic
Principle Of Conservation Of Linear Momentum, And Some Applications 51:20 Basic
Problems On Impulse, Collision, And Linear Momentum Conservation II (CE) 52:07 Advance
Problems On Impulse, Collision, And Linear Momentum Conservation (CE) 1:01:21 Advance
Problems On Impulse, Collision, And Linear Momentum Conservation III (CE) 1:01:52 Advance
Problems On Motion Of A Rocket 48:01 Basic
Problems On Principle Of Linear Momentum Conservation 45:01 Basic
Advanced-Level Problems On Impulse, Collosion, And Centre Of Mass IX 53:03 Advance
Advanced-Level Problems On Impulse, Collosion, And Centre Of Mass X 1:27:01 Advance
Advanced-Level Problems On Impulse, Collosion, And Centre Of Mass IV 1:03:04 Advance
9. #### Rotational Mechanics 44 Videos

When a rigid body performs rotational motion, the individual particles follow different paths and process, different linear velocities and accelerations at any particular instant. The study of rotational motion in the present topic requires that we treat the body as an assemblage of many particles, connected firmly to one another and each moving with its own velocity and acceleration. To strengthen your concept and consolidate your problem-solving skill we offer you video lectures on Kinematics of Rotation about a Fixed Axis, Equation of Rotational Motion of Rigid Body, Torque of a Force Acting on a Particle, Two Important Theorem on Moment of Inertia, Equation of Rotational Motion of a Rigid Body, Over Turning of Vehicles at a Bend, Angular momentum of a Particle and Its Relation with Torque and many more.

A Cylinder Falling At The End Of An Unwinding String 41:25 Basic
Angular Momentum Of A Particle And Its Relation With Torque 57:10 Basic
Applications Of Parallel And Perpendicular Axes Theorems 46:50 Basic
Calculation Of Moments Of Inertia For Various Bodies II 49:23 Basic
Combined Translational And Rotational Motion As Pure Rotation 58:52 Basic
Equation Of Rotational Motion Of A Rigid Body 44:58 Basic
Kinematics Of Rotation About A Fixed Axis 59:52 Basic
Moment Of Inertia, And Its Calculation For Various Bodies 56:08 Basic
More Problems On Angular Momentum 59:10 Basic
More Problems On Equation Of Rotational Motion Of Rigid Body 47:57 Basic
Overturning Of A Vehicle At A Bend 53:58 Basic
Problems On Rotational Mechanics (CE) 1:04:17 Advance
Problems On Rotational Mechanics II (CE) 1:12:42 Advance
Problems On Rotational Mechanics III (CE) 1:06:48 Advance
Problems On Rotational Mechanics IV (CE) 1:04:12 Advance
Principle Of Conservation Of Angular Momentum, And Its Applications 34:47 Basic
Problems on angular impulse 43:31 Basic
Problems On Angular Momentum Of A Particle 1:03:24 Basic
Problems On Moments Of Inertia Of Various Bodies 41:14 Basic
Problems On Moments Of Inertia Of Various Bodies II 53:40 Basic
Problems On Principle Of Angular Momentum Conservation 1:01:03 Basic
Problems On Rolling Motion At The End Of Unwinding String 49:40 Basic
Problems On Rolling Motion Down An Incline 1:12:27 Basic
Problems On Rolling Motion On Horizontal Floor 1:05:44 Basic
Problems On Rotating Pulley Of Non-Negligible Mass 37:59 Basic
Rolling Motion Of A Rigid Body Down An Incline 49:48 Basic
Rolling Motion Of A Rigid Body On Horizontal Floor 1:08:46 Basic
Rotational Kinetic Energy, And Comparison Between Translation And Rotation 58:40 Basic
Torque Of A Force Acting On A Particle 44:39 Basic
Torque Of Coplanar Forces And Of A Couple 44:48 Basic
Two Important theorems On Moment Of Inertia 30:42 Basic
Work And Power In Rotational Motion 28:46 Basic
Angular Momentum Of System Of Particles And Angular Impulse 32:23 Basic
10. #### Statics of Rigid Bodies 14 Videos

When engineers construct buildings and flyovers and designers design small items like scissors, forks, ect, they keep two things in mind. First, the conditions under which the bodies, presumed to be rigid, remain in mechanical equilibrium under the action of external forces and their torques. And second, the conditions under which the bodies continue to remain rigid under the said forces and torques.The branch of physics which studies the condition of equilibrium of a body at rest is called statics. All bodies which attain equilibrium under a set of forces are deformed to a certain extent. However, if these forces are comparatively small, the deformation is also small and the conditions of static equilibrium remain unaffected. At this point, it will be tacitly assumed that the bodies under investigation remain perfectly rigid when a set of forces and torques act on them. You will enjoy the topic while learning through the video lectures on Stability of Static Equilibrium, Various Cases of Static Equilibrium In Two Dimensions, Equilibrium of A Leaning Ladder, Centre of Gravity of a Rigid Body and many more.

Centre Of Gravity Of A Rigid Body 1:14:42 Basic
Conditions Of Static Equilibrium Of A Rigid Body 44:30 Basic
Equilibrium Of A Leaning Ladder 1:08:23 Basic
More Problems On Equilibrium Of A Leaning Ladder 1:06:36 Basic
Stability Of Static Equilibrium 1:02:10 Basic
Various Cases Of Static Equilibrium In Two Dimensions II 1:22:55 Basic
Various Cases Of Static Equilibrium In Two Dimensions 1:20:40 Basic
11. #### Gravitation 32 Videos

We told you in topic 4 that the gravitational force is one of the three fundamental forces of nature, the other two being the electromagnetic force and the nuclear force. The nuclear force operates inside an atomic nucleus and does not make its presence felt in everyday life. The electromagnetic force is often disguised as various forms of contact force. But whether it is the orbital motion of a planet round the sun or the free fall of an apple from a tree, the effect of the gravitational force is easy for all to feel. For your easy understanding of the subject and to increase your level of command to crack and solve the variety of numerical problems, we have video lectures on Newton’s Law of Universal Gravitation, Determination of the Gravitational Constant G, Kepler’s Laws of Planetary Motion, Gravity, Gravitational Field, Gravitational Potential Energy, Gravitational Potential, Escape Speed, Natural and Artificial Satellites of Motion, Mechanical Energy of Satellite-Earth System, etc.

Determination Of Gravitational Constant G 38:51 Basic
Escape Speed 47:07 Basic
Gravitational Field And Potential Due To Some Extended Bodies 51:39 Basic
Gravitational Field And Potential Due To Some Extended Bodies II 39:09 Basic
Gravitational Field 45:32 Basic
Gravitational Potential Energy 1:00:14 Basic
Gravitational Potential 45:04 Basic
Gravity 47:34 Basic
Kepler's Laws Of Planetary Motion 48:45 Basic
Mechanical Energy Of Satellite-Earth System 1:02:11 Basic
More Problems On Escape Speed And Gravitational Potential 1:05:27 Basic
More Problems On Mechanical Energy Of Satellite-Earth System 52:36 Basic
Natural And Artificial Satellites Of Planets 54:26 Basic
Newton's Law Of Universal Gravitation 32:23 Basic
Problems On Escape Speed 53:31 Basic
Problems On Gravitational Field And Potential Due To Extended Bodies 1:11:17 Basic
Problems On Newton's Law Of Gravitation 1:05:22 Basic
Problems On Orbital Motion Of Satellites 01:07:09 Basic
Problems On Variation Of Acceleration Due To Gravity 1:00:27 Basic
Problems On Gravitation (CE) 1:11:03 Advance
Problems On Gravitation II (CE) 1:04:50 Advance
Problems On Gravitation III (CE) 1:22:47 Advance
Variation Of Acceleration Due To Gravity I 58:19 Basic
Variation Of Acceleration Due To Gravity II 57:07 Basic

# Elasticity and Fluid Mechanics  [ 4 Topics ]

1. #### Elasticity 15 Videos

While studying conditions of static equilibrium under Mechanics, we conveniently assumed that the bodies under investigation remained perfectly rigid under a set of forces and torques. In reality, no solid body is perfectly rigid. So, when a system of balanced forces or couples acts on a solid body at rest, the body gets deformed. In other words, though the body does not exhibit any translational or rotational motion as a whole, different parts within it change their relative positions with respect to each other. A light wire, attached to the ceiling and holding a load at its free end, stretches in length. A book lying on a table, subjected to a tangential force on the top cover, changes in shape. A metal sphere taken to the depths of the sea shrinks in volume, albeit by a tiny fraction. The common word for any such change is deformation. The property by virtue of which a body resists any change in its size, shape or both and tends to regain its configuration on withdrawal of the deforming forces is known at the elasticity of the body. To impart in-depth knowledge on the theory of elasticity and to develop skill in solving problems based on this topic, we offer a series of video lectures titled Internal Forces and Stress, Strain, Hooke's Law and Young's Modulus, Shear Modulus, Bulk Modulus, Stress Versus Strain Graph, Elastic Potential Energy of a Deformed Body, and so on.

Bulk Modulus & Relations Among Elastic Constants 1:01:41 Basic
Hooke's Law And Young's Modulus 58:42 Basic
Internal Forces And Stress 58:07 Basic
More Problems On Elastic Potential Energy 56:19 Basic
More Problems On Shear Modulus And Bulk Modulus 46:27 Basic
More Problems On Young's Modulus 58:14 Basic
Problems On Elasticity (CE) 1:07:42 Advance
Shear Modulus 53:48 Basic
Strain 33:25 Basic
Stress Versus Strain Graph And Elastic Potential Energy Of A Deformed Body 1:09:29 Basic
2. #### Fluid Statics 31 Videos

Matter can be classified into three types: solids, liquids and gases. A solid can withstand shear stress; it has definite volume and shape. Liquids and gases cannot withstand static shear stress and begin to flow under it; hence they are collectively referred to as fluids. None of the fluids has any definite shape of its own and eventually takes the shape of the vessel in which it is kept. While a liquid occupies a definite volume almost unaffected even by very high pressure, a gas can be compressed easily. Because of these distinctive features, we can tell a solid from a fluid in most cases. But there are exceptions such as asphalt. It looks so much like a solid but, in reality, it is a fluid that flows very, very slowly. A single substance may remain in any one of the three states under varying physical conditions. As you all know, if the substance is H2O, the states are named ice (solid), water (liquid) and water vapour (gas). The mechanics of fluids is governed by a number of physical principles which are based on Newton's laws of motion and other force laws. Fluid statics is that part of Fluid Mechanics which discusses fluids at rest. We shall impart a comprehensive knowledge on this topic through a series of video lectures titled Pressure at a Point, Variation of Pressure in a Static Fluid, Measurement of Pressure, Pascal's Principle, Buoyancy and Archimedes' Principle, Equilibrium of a Floating Body, and many more.

Problems On Buoyant Force II 1:00:05 Basic
Problems On Density 34:40 Basic
Problems On Pressure 1:08:24 Basic
Problems On Pressure II 1:04:52 Basic
Problems On Hydrostatics (CE) 1:04:40 Advance
Problems On Hydrostatics II (CE) 1:07:50 Advance
Density 43:48 Basic
Pressure At A Point 46:10 Basic
Variation Of Pressure In A Static Fluid 48:05 Basic
Variation Of Fluid Pressure In An Accelerated Vessel 57:19 Basic
Measurement Of Pressure, And Pascal's Principle 01:06:05 Basic
Buoyancy And Archimedes' Principle 37:30 Basic
Problems On Buoyant Force I 01:21 Basic
Problems On Buoyant Force III 01:07:49 Basic
Immersion And Flotation, Equilibrium Of A Floating Body 01:02:11 Basic
Problems On Equilibrium And Stability Of A Floating Body 01:05:22 Basic
Problems On Buoyant Force IV 1:29:51 Basic
Problems On Pressure III 1:32:50 Basic
Problems On Measurement Of Pressure 1:37:58 Basic
Problems On Dam And Hydraulic Press 1:29:20 Basic
3. #### Surface Tension 18 Videos

A piece of camphor dances on the surface of water without any obvious provocation. A water spider can skate on a pond without wetting its legs. A container with a small hole at the bottom can manage to hold mercury. Great effort is required to separate two flat glass plates if there is a thin layer of water between them. When a narrow glass tube open at both ends is dipped into water, water rises in the tube. All these events can be explained by the fluid property called surface tension. Surface tension is a molecular phenomenon which occurs at the surface of separation between two phases such as a liquid and a solid, a liquid and a gas, or a solid and a gas. We shall teach you the basics of surface tension first, and then follow up with a large number of problems at both simple and challenging levels. Our video lectures on this topic are titled Theory of Surface Tension, Angle of Contact and Shape of Meniscus, Excess Pressure within Liquid Drop and Soap Bubble, Force between Two Plates Separated by a Liquid Film, Rise or Fall of a Liquid in a Capillary Tube, and much more.

Problems On Surface Tension (CE) 1:07:54 Advance
Rise Or Fall Of A Liquid In A Capillary Tube 01:34:58 Basic
Theory Of Surface Tension 1:24:58 Basic
Examples Of Surface Tension 1.1GB Basic
Angle Of Contact And Shape Of Meniscus 50:49 Basic
Problems On Theory Of Surface Tension And Angle Of Contact 1:24:58 Basic
Excess Pressure Within Liquid Drop And Soap Bubble 45:00 Basic
Problems On Excess Pressure Within Liquid Drop And Soap Bubble 50:49 Basic
Experimental Determination Of Surface Tension, And Factors Affecting Surface Tension 34:00 Basic
Force Between Two Plates Separated By A Liquid Film 1:04:49 Basic
Problems On Rise Or Fall Of A Liquid In A Capillary Tube 1:38:25 Basic
4. #### Fluid Dynamics and Viscosity 24 Videos

While the motion of rigid bodies is rather uninteresting, the motion of fluids observed in nature can indeed be pleasing to the eye. The flow of a gurgling stream, the eruption of molten lava, the swirl of hot gases from a burning tinder, ocean waves – all these and more are the subject of fluid dynamics. While each particle of the fluid follows Newton's laws of motion, we find it convenient to describe the properties of the fluid at each point on its path as a function of time. The motion of a real fluid is complex and not yet fully understood. Therefore, we often make matters simple by assuming an ideal fluid which is non-viscous and incompressible. Further, the flow of the ideal fluid is assumed to be steady and irrotational. However, in the latter part of the topic, we discuss viscosity and steady flow of a viscous fluid. The students will acquire a commanding grip on the topic and will learn to solve a variety of problems – simple to moderate to difficult – through a series of video lectures titled Equation of Continuity, Bernoulli's Equation, Some Applications of Bernoulli's Equation, Viscosity, Poiseuille's Law, Critical Speed and Reynolds Number, Motion of a Solid Body in a Viscous Fluid, et cetera.

Problems On Hydrodynamics (CE) 1:02:10 Advance
Problems On Hydrodynamics II (CE) 1:07:37 Advance
VISCOSITY 01:07:05 Basic
Steady Flow And Turbulent Flow, Equation Of Continuity 1:08:25 Basic
Bernoulli's Equation 43:35 Basic
Problems On Bernoulli's Equation 43:53 Basic
Some Applications Of Bernoulli's Equation 1:33:18 Basic
Problems On Applications Of Bernoulli's Equation I 1:24:14 Basic
Problems On Applications Of Bernoulli's Equation II 1:24:07 Basic
Problems On Viscosity 46:07 Basic
Poiseuille's Law On Laminar Viscous Flow In A Pipe 1:32:38 Basic
Calculus-based Proof Of Poiseuille's Law 1:38:58 Basic
Critical Speed And Reynolds Number 33:09 Basic
Motion Of A Solid Body In A Viscous Fluid 1:25:16 Basic
More Problems On Viscosity 42:19 Basic

# Thermal Physics  [ 3 Topics ]

1. #### Thermal Expansion 17 Videos

In general, all bodies expand when they are heated and contract when cooled. The expansion or contraction, as the case may be, is small in solids, larger in liquids, and the largest in gases.

The increase in length, width or height of a solid is called linear expansion; the increase in area is called surface expansion; the increase in volume is called volume or cubical expansion.

A liquid or a gas has only volume expansion. We have video lectures on various subtopics such as expansion of solids, relation among coefficients of expansion, variation in density with temperature, effects of thermal expansion, apparent and real expansions of a liquid, anomalous expansion of water, expansion of gases, equation of state of an ideal gas etc to provide in-depth knowledge in an unmatched way.

Effects Of Thermal Expansion Of Liquids 111 Basic
Expansion Of Gases 111 Basic
Expansion Of Gases II 111 Basic
Measurement Of Coefficients Of Expansion Of A Liquid 111 Basic
Problems On Expansion Of Gases 111 Basic
Problems On Thermal Expansion Of Liquids And Its Effects I 111 Basic
Thermal expansion of solids 1:37:16 Basic
Effects of thermal expansion of solids 1:02:06 Basic
Problems on thermal expansion of solids and its effects I 1:05:32 Basic
Thermal expansion of liquids 1:08:35 Basic
2. #### Calorimetry And Change Of Phase 14 Videos

Up to the middle of the 19th century, the majority of scientists wrongfully believed in the caloric theory of heat. That old theory now stands discarded, and we must define heat in modern terms with clear reference to (ordered and disordered) internal energy.

When a hot body is brought into contact with comparably cold surroundings, heat flows from the body to the surroundings until their temperatures become equal. The fundamental principle of calorimetry is: heat lost by hotter system is equal to heat gained by colder surroundings. The term "phase" means the state in which a substance exists, i.e. solid, liquid or gas.

When a substance changes phase, the heat flowing into or out of the system does not change its temperature, but the potential energy of the molecules (ordered part of internal energy). You will find video lectures on definition and units of heat, specific and molar heat capacities, principle of calorimetry, phase change and latent heat, equivalence between mechanical work and heat, various types of phase change etc, lucidly explained with applications and numerical examples.

Equivalence Between Mechanical Work And Heat, And Determination Of Mechanical Equivalent Of Heat 1:27:21 Basic
More Problems On Calorimetry And Error Correction 41:55 Basic
Problems On Latent Heat 1:04:33 Basic
Sources Of Error In Experiments Of Calorimetry 1:27:14 Basic
Various Types Of Phase Change 1:07:4 Basic
Latent Heat And Its Experimental Determination 222 Basic
Definition Of Heat And Types Of Heat Capacity 222 Basic
Principle Of Calorimetry, And Determination Of Specific Heat By Method Of Mixtures 222 Basic
Problems On Heat Capacity 111 Basic
3. #### Kinetic Theory Of Gases, And Properties Of Vapour 17 Videos

The experiments of James Joule during the 1840s proved beyond doubt that mechanical work and heat are equivalent. They also delivered the final blow to the caloric theory of heat.

The collapse of the caloric theory inspired three gentlemen – Rudolf Clausius, Clerk Maxwell and Ludwig Boltzmann – to develop the kinetic (or molecular) theory of gases. In the first decade of 20th century, investigation and explanation of Brownian motion of colloidal particles by Albert Einstein and Jean Perrin paved the way for the final acceptance of kinetic theory of heat. Although originally developed for gases, it can be extended to explain the thermal phenomena in solids and liquids as well.

This topic consists of video lectures on basic concepts of kinetic theory of heat, kinetic model of an ideal gas, pressure exerted by an ideal gas, root mean square speed (RMS speed), interpretation of temperature from kinetic theory, mean free path, Brownian motion, saturated and unsaturated vapours, properties of saturated vapour, phase diagrams, hygrometry etc.

Basic Concepts Of Kinetic Theory Of Heat, And Kinetic Model Of An Ideal Gas 32:29 Basic
More Problems On Pressure And Translational Kinetic Energy Of A Gas 1:20:54 Basic
Pressure Exerted By An Ideal Gas 1:38:17 Basic
Translational Kinetic Energy Of A Gas 1:02:19 Basic
Advanced-level Problems On Kinetic Theory Of Gases And Properties Of Vapour I 1:11:47 Advance
Advanced-level Problems On Kinetic Theory Of Gases And Properties Of Vapour II 1:11:47 Advance
Advanced-level Problems On Kinetic Theory Of Gases And Properties Of Vapour III 1:31:46 Advance
Advanced-level Problems On Kinetic Theory Of Gases And Properties Of Vapour IV 1:10:40 Advance
Brownian Motion, And Deviation From Ideal Gas Behaviour 1:13:07 Basic
Deduction Of Gas Laws From Kinetic Theory Of Gases 29:47 Basic
Distribution Of Molecular Speeds 1:01:33 Basic
Hygrometry 1:10:33 Basic
Mean Free Path 1:40:1 Basic
Phase Diagrams 44:25 Basic
Problems On Brownian Motion, And Deviation From Ideal Gas Behaviour 1:05:30 Basic
Problems On Hygrometry 57:18 Basic
Saturated Vapour And Its Properties 1:06:33 Basic

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