Newton’s three laws and provides a deep understanding of their implications. Starting with Newton’s First Law of Motion, also known as the Law of Inertia, we delve into how objects behave when at rest or in uniform motion.
Newton’s Second Law of Motion, we unravel the relationship between mass, acceleration and external forces.
Newton’s Third Law of Motion, shedding light on the concept of action and reaction.
Newton’s First Law of Motion
Newton’s first law of motion states that objects persist in their current state of motion unless compelled to do otherwise by an external force. Whether an object is at rest or in uniform motion, it will continue in that state unless a net external force acts upon it.
One crucial insight provided by Newton’s First Law is that the object will maintain a constant velocity in the absence of a net force resulting from unbalanced forces acting on an object.
If the object is already in motion, it will continue moving at the same speed and direction. Likewise, if the object is at rest, it will remain stationary. However, introducing an additional external force will cause the object’s velocity to change, responding to the magnitude and direction of the force applied.
Newton’s Second Law of Motion
Newton’s Second Law of Motion, which provides a deeper understanding of how bodies respond to external forces.
The second law of motion describes the relationship between the force acting on a body and the resulting acceleration. According to Newton’s second law, the force acting on an object is equal to the product of its mass and acceleration.
Mathematically, we express Newton’s Second Law as follows:
\(\begin{array}{l}F=m\times a\end{array} \)
Here, F represents the force, m is the object’s mass and a is the acceleration produced. This equation reveals that the acceleration of an object is directly proportional to the magnitude of the net force applied in the same direction as the force and inversely proportional to the object’s mass.
By understanding Newton’s Second Law, we can determine how much an object will accelerate when subjected to a specific net force. The equation highlights the intricate relationship between force, mass, and acceleration, providing a quantitative framework for analysing the dynamics of objects in motion.
In the second law equation, a proportionality constant is represented by the letter “k.” When using the SI unit system, this constant is equal to 1. Therefore, the final expression simplifies to:
\(\begin{array}{l}F=m\times a\end{array} \)
The concise and powerful expression of Newton’s Second Law showcases the fundamental principle that governs the relationship between force and acceleration in physics. With this law, we gain a quantitative understanding of how external forces impact the motion of objects based on their mass and the resulting acceleration they experience.
Newton’s Third Law of Motion
Newton’s Third Law of Motion, revealing a fascinating relationship between forces exerted by interacting bodies.
Newton’s Third Law of Motion states that for every action, there is an equal and opposite reaction. When two bodies interact, they apply forces on each other that are equal in magnitude and opposite in direction. This law highlights the concept that forces always occur in pairs.
To illustrate this principle, consider the example of a book resting on a table. As the book applies a downward force equal to its weight on the table, the table, in turn, exerts an equal and opposite force on the book. This occurs because the book slightly deforms the table’s surface, causing the table to push back on the book, much like a compressed spring releasing its energy.
This third law of motion has profound implications, including conserving momentum.
Momentum is a property of moving objects determined by an object’s mass and velocity.
According to Newton’s third law, the total momentum of an isolated system remains constant. This means that in any interaction, the total momentum before and after the interaction remains the same, regardless of the forces involved.
Understanding Newton’s third law of motion deepens our comprehension of the interconnectedness and equilibrium within the physical world. It provides a framework for analysing and predicting the effects of forces in various scenarios, from everyday interactions to complex mechanical systems.
Laws of Motion Summary
The flowchart highlights the three laws of motion established by Sir Isaac Newton:
Newton’s First Law of Motion: The law of inertia states that an object at rest will remain at rest, and an object in motion will continue moving with a constant velocity, unless acted upon by an external force.
Newton’s Second Law of Motion: This law relates the force acting on an object to its mass and acceleration. The force is equal to the product of mass and acceleration, where acceleration is the rate of change of velocity.
Newton’s Third Law of Motion: The law of action and reaction states that for every action, there is an equal and opposite reaction. When one body exerts a force on another body, the second body simultaneously exerts a force of the same magnitude but in the opposite direction on the first body.
By referring to this flowchart, you can quickly learn the fundamental principles of Newton’s Laws of Motion and understand how they govern the behaviour of objects in various scenarios. It serves as a useful tool for remembering Newton’s three laws of motion.
Laws of Motion Numericals
1. Suppose a bike with a rider on it having a total mass of 63 kg brakes and reduces its velocity from 8.5 m/s to 0 m/s in 3.0 seconds. What is the magnitude of the braking force?
Solution:
The combined mass of the rider and the bike = 63 kg Initial Velocity = 8.5 m/s Final Velocity = 0 m/s The time in which the bike stops = 3 s
The net force acting on the body equals the rate of change of an object’s momentum.
2. Calculate the net force required to give an automobile of mass 1600 kg an acceleration of 4.5 m/s2.
We calculate the force using the following formula.
F=ma
Substituting the values in the equation, we get
F=1600 x 4.5=7200 N
Frequently Asked Questions – FAQs
Q1
Who discovered the three laws of motion?
Sir Isaac Newton discovered the three laws of motion.
Q2
Why are the laws of motion important?
Newton’s laws are essential because they relate to everything we do or see in everyday life. These laws tell us how things move or stay still and why we don’t float out of our bed or fall through the floor of our house.
Q3
What are Newton’s laws of motion all about?
Newton’s laws of motion imply the relationship between an object’s motion and the forces acting on it. In the first law, we understand that an object will not change its motion unless a force acts on it. The second law states that the force on an object is equal to its mass times its acceleration. And finally, the third law states that there is an equal and opposite reaction for every action.
Q4
What is the difference between Newton’s laws of motion and Kepler’s laws of motion?
Newton’s laws of motion are general and apply to any motion, while Kepler’s laws apply only to planetary motion in the solar system.
Q5
What are some daily life examples of Newton’s 1st, 2nd and 3rd laws of motion?
The motion of a ball falling through the atmosphere or a model rocket being launched up into the atmosphere are both excellent examples of Newton’s 1st law.
Riding a bicycle is an excellent example of Newton’s 2nd law. In this example, the bicycle is the mass. The leg muscles pushing on the pedals of the bicycle is the force.
You hit a wall with a certain amount of force, and the wall returns that same amount of force. This is an example of Newton’s 3rd law.
Neeraj Anand, Param Anand
Er. Neeraj K.Anand is a freelance mentor and writer who specializes in Engineering & Science subjects. Neeraj Anand received a B.Tech degree in Electronics and Communication Engineering from N.I.T Warangal & M.Tech Post Graduation from IETE, New Delhi. He has over 30 years of teaching experience and serves as the Head of Department of ANAND CLASSES. He concentrated all his energy and experiences in academics and subsequently grew up as one of the best mentors in the country for students aspiring for success in competitive examinations.
In parallel, he started a Technical Publication "ANAND TECHNICAL PUBLISHERS" in 2002 and Educational Newspaper "NATIONAL EDUCATION NEWS" in 2014 at Jalandhar. Now he is a Director of leading publication "ANAND TECHNICAL PUBLISHERS", "ANAND CLASSES" and "NATIONAL EDUCATION NEWS".
He has published more than hundred books in the field of Physics, Mathematics, Computers and Information Technology. Besides this he has written many books to help students prepare for IIT-JEE and AIPMT entrance exams. He is an executive member of the IEEE (Institute of Electrical & Electronics Engineers. USA) and honorary member of many Indian scientific societies such as Institution of Electronics & Telecommunication Engineers, Aeronautical Society of India, Bioinformatics Institute of India, Institution of Engineers. He has got award from American Biographical Institute Board of International Research in the year 2005.
Below we have provided the details of the CBSE Physics topics under each unit as per the revised CBSE Class 11 Physics Syllabus for the 2023-24 academic year. Go through it to get the details of the chapters given below.
Unit-I: Physical World and Measurement
Chapter 2: Units and Measurements
Need for measurement: Units of measurement; systems of units; SI units, fundamental and derived units. Length, mass and time measurements; accuracy and precision of measuring instruments; errors in measurement; significant figures.
Dimensions of physical quantities, dimensional analysis and its applications.
Unit-II: Kinematics
Chapter 3: Motion in a Straight Line
Frame of reference, Motion in a straight line, Elementary concepts of differentiation and integration for describing motion, uniform and nonuniform motion, and instantaneous velocity, uniformly accelerated motion, velocity-time and position-time graphs. Relations for uniformly accelerated motion (graphical treatment).
Chapter 4: Motion in a Plane
Scalar and vector quantities; position and displacement vectors, general vectors and their notations; equality of vectors, multiplication of vectors by a real number; addition and subtraction of vectors, relative velocity, Unit vector; resolution of a vector in a plane, rectangular components, Scalar and Vector product of vectors.
Motion in a plane, cases of uniform velocity and uniform acceleration-projectile motion, uniform circular motion.
Unit-III: Laws of Motion
Chapter 5: Laws of Motion
Intuitive concept of force, Inertia, Newton’s first law of motion; momentum and Newton’s second law of motion; impulse; Newton’s third law of motion (recapitulation only). Law of conservation of linear momentum and its applications. Equilibrium of concurrent forces, Static and kinetic friction, laws of friction, rolling friction, lubrication.
Dynamics of uniform circular motion: Centripetal force, examples of circular motion (vehicle on a level circular road, vehicle on a banked road).
Unit-IV: Work, Energy and Power
Chapter 6: Work, Energy and Power
Work done by a constant force and a variable force; kinetic energy, work-energy theorem, power.
Notion of potential energy, potential energy of a spring, conservative forces: conservation of mechanical energy (kinetic and potential energies); non-conservative forces: motion in a vertical circle; elastic and inelastic collisions in one and two dimensions.
Unit-V: Motion of System of Particles and Rigid Body
Chapter 7: System of Particles and Rotational Motion
Centre of mass of a two-particle system, momentum conservation and centre of mass motion. Centre of mass of a rigid body; centre of mass of a uniform rod. Moment of a force, torque, angular momentum, law of conservation of angular momentum and its applications.
Equilibrium of rigid bodies, rigid body rotation and equations of rotational motion, comparison of linear and rotational motions.
Moment of inertia, radius of gyration, values of moments of inertia for simple geometrical objects (no derivation).
Unit-VI: Gravitation
Chapter 8: Gravitation
Kepler’s laws of planetary motion, universal law of gravitation. Acceleration due to gravity and its variation with altitude and depth. Gravitational potential energy and gravitational potential, escape speed, orbital velocity of a satellite.
Unit-VII: Properties of Bulk Matter
Chapter 9: Mechanical Properties of Solids
Elasticity, Stress-strain relationship, Hooke’s law, Young’s modulus, bulk modulus, shear modulus of rigidity (qualitative idea only), Poisson’s ratio; elastic energy.
Chapter 10: Mechanical Properties of Fluids
Pressure due to a fluid column; Pascal’s law and its applications (hydraulic lift and hydraulic brakes), effect of gravity on fluid pressure.
Viscosity, Stokes’ law, terminal velocity, streamline and turbulent flow, critical velocity, Bernoulli’s theorem and its applications.
Surface energy and surface tension, angle of contact, excess of pressure across a curved surface, application of surface tension ideas to drops, bubbles and capillary rise.
Chapter 11: Thermal Properties of Matter
Heat, temperature,( recapitulation only) thermal expansion; thermal expansion of solids, liquids and gases, anomalous expansion of water; specific heat capacity; Cp, Cv – calorimetry; change of state – latent heat capacity.
Heat transfer-conduction, convection and radiation (recapitulation only), thermal conductivity, qualitative ideas of Blackbody radiation, Wein’s displacement Law, Stefan’s law.
Unit-VIII: Thermodynamics
Chapter 12: Thermodynamics
Thermal equilibrium and definition of temperature (zeroth law of thermodynamics), heat, work and internal energy. First law of thermodynamics, Second law of thermodynamics: gaseous state of matter, change of condition of gaseous state -isothermal, adiabatic, reversible, irreversible, and cyclic processes.
Unit-IX: Behaviour of Perfect Gases and Kinetic Theory of Gases
Chapter 13: Kinetic Theory
Equation of state of a perfect gas, work done in compressing a gas.
Kinetic theory of gases – assumptions, concept of pressure. Kinetic interpretation of temperature; rms speed of gas molecules; degrees of freedom, law of equi-partition of energy (statement only) and application to specific heat capacities of gases; concept of mean free path, Avogadro’s number.
Unit-X: Oscillations and Waves
Chapter 14: Oscillations
Periodic motion – time period, frequency, displacement as a function of time, periodic functions and their application.
Simple harmonic motion (S.H.M) and its equations of motion; phase; oscillations of a loaded spring- restoring force and force constant; energy in S.H.M. Kinetic and potential energies; simple pendulum derivation of expression for its time period.
Chapter 15: Waves
Wave motion: Transverse and longitudinal waves, speed of travelling wave, displacement relation for a progressive wave, principle of superposition of waves, reflection of waves, standing waves in strings and organ pipes, fundamental mode and harmonics, Beats.
Students can also access the syllabus for other subjects by visiting Syllabus page of CBSE Class 11.
CBSE Syllabus for Class 11 Physics Practical
Below are the list of the experiments of Physics practicals.
Evaluation Scheme for Class 11 Physics Practical 2023-24
Topic
Marks
Two experiments, one from each section
7 + 7
Practical record (experiment and activities)
5
One activity from any section
3
Investigatory Project
3
Viva on experiments, activities and project
5
Total
30
CBSE Class 11 Physics Practical Syllabus
Section – A
CBSE 11 Physics Syllabus Experiments
1. To measure the diameter of a small spherical/cylindrical body and to measure internal diameter and depth of a given beaker/calorimeter using Vernier Callipers and hence find its volume. 2. To measure the diameter of a given wire and thickness of a given sheet using screw gauge. 3. To determine the volume of an irregular lamina using the screw gauge. 4. To determine the radius of curvature of a given spherical surface by a spherometer. 5. To determine the mass of two different objects using a beam balance. 6. To find the weight of a given body using parallelogram law of vectors. 7. Using a simple pendulum, plot its L-T2 graph and use it to find the effective length of second’s pendulum. 8. To study variation of time period of a simple pendulum of a given length by taking bobs of same size but different masses and interpret the result. 9. To study the relationship between force of limiting friction and normal reaction and to find the co- efficient of friction between a block and a horizontal surface. 10. To find the downward force, along an inclined plane, acting on a roller due to gravitational pull of the earth and study its relationship with the angle of inclination θ by plotting graph between force and sin θ.
CBSE 11 Physics Syllabus Activities
1. To make a paper scale of given least count, e.g., 0.2cm, 0.5 cm. 2. To determine mass of a given body using a metre scale by principle of moments. 3. To plot a graph for a given set of data, with proper choice of scales and error bars. 4. To measure the force of limiting friction for rolling of a roller on a horizontal plane. 5. To study the variation in range of a projectile with angle of projection. 6. To study the conservation of energy of a ball rolling down on an inclined plane (using a double inclined plane). 7. To study dissipation of energy of a simple pendulum by plotting a graph between square of amplitude and time.
Section – B
CBSE 11 Physics Syllabus Experiments
1. To determine Young’s modulus of elasticity of the material of a given wire. 2. To find the force constant of a helical spring by plotting a graph between load and extension. 3. To study the variation in volume with pressure for a sample of air at constant temperature by plotting graphs between P and V, and between P and 1/V. 4. To determine the surface tension of water by capillary rise method. 5. To determine the coefficient of viscosity of a given viscous liquid by measuring terminal velocity of a given spherical body. 6. To study the relationship between the temperature of a hot body and time by plotting a cooling curve. 7. To determine specific heat capacity of a given solid by method of mixtures. 8. To study the relation between frequency and length of a given wire under constant tension using sonometer. 9. To study the relation between the length of a given wire and tension for constant frequency using sonometer. 10. To find the speed of sound in air at room temperature using a resonance tube by two resonance positions.
CBSE 11 Physics Syllabus Activities
1. To observe change of state and plot a cooling curve for molten wax. 2. To observe and explain the effect of heating on a bi-metallic strip. 3. To note the change in level of liquid in a container on heating and interpret the observations. 4. To study the effect of detergent on surface tension of water by observing capillary rise. 5. To study the factors affecting the rate of loss of heat of a liquid. 6. To study the effect of load on depression of a suitably clamped metre scale loaded at (i) its end (ii) in the middle. 7. To observe the decrease in pressure with increase in velocity of a fluid.
Practical Examination for Visually Impaired Students of Class 11 Evaluation Scheme
Time: 2 Hours Max. Marks: 30
Topic
Marks
Identification/Familiarity with the apparatus
5
Written test (based on given/prescribed practicals)
10
Practical Record
5
Viva
10
Total
30
A. Items for Identification/Familiarity of the apparatus for assessment in practicals (All experiments).
Spherical ball, Cylindrical objects, vernier calipers, beaker, calorimeter, Screw gauge, wire, Beam balance, spring balance, weight box, gram and milligram weights, forcep, Parallelogram law of vectors apparatus, pulleys and pans used in the same ‘weights’ used, Bob and string used in a simple pendulum, meter scale, split cork, suspension arrangement, stop clock/stop watch, Helical spring, suspension arrangement used, weights, arrangement used for measuring extension, Sonometer, Wedges, pan and pulley used in it, ‘weights’ Tuning Fork, Meter scale, Beam balance, Weight box, gram and milligram weights, forceps, Resonance Tube, Tuning Fork, Meter scale, Flask/Beaker used for adding water.
B. List of Practicals
1. To measure diameter of a small spherical/cylindrical body using vernier calipers. 2. To measure the internal diameter and depth of a given beaker/calorimeter using vernier calipers and hence find its volume. 3. To measure diameter of given wire using screw gauge. 4. To measure thickness of a given sheet using screw gauge. 5. To determine the mass of a given object using a beam balance. 6. To find the weight of given body using the parallelogram law of vectors. 7. Using a simple pendulum plot L-T and L-T2 graphs. Hence find the effective length of second’s pendulum using appropriate length values. 8. To find the force constant of given helical spring by plotting a graph between load and extension. 9. (i) To study the relation between frequency and length of a given wire under constant tension using a sonometer. (ii) To study the relation between the length of a given wire and tension, for constant frequency, using a sonometer. 10. To find the speed of sound in air, at room temperature, using a resonance tube, by observing the two resonance positions.
Note: The above practicals of CBSE 11 Physics Syllabus may be carried out in an experiential manner rather than recording observations.
Did you find CBSE 11 Physics Syllabus useful for your studies? Do let us know your view in the comment section. Get access to interactive lessons and videos related to CBSE Maths and Science with ANAND CLASSES (A School Of Competitions) – The Learning App.
Frequently Asked Questions on CBSE Class 11 Physics Syllabus
Q1
According to the CBSE Class 11 Physics Syllabus, which are the units of high marks weightage?
According to the CBSE Class 11 Physics Syllabus, physical world and measurement, kinematics and laws of motion are the units of high-mark weightage.
Q2
How is the practical syllabus of the CBSE Class 11 Physics divided into sections A and B?
The practical syllabus of the CBSE Class 11 Physics contains 10 experiments in section A and 10 experiments in section B with 7 physical activities mentioned for each.
Q3
Which are the basic concepts present in the CBSE Syllabus for Class 11 Physics?
The basic concepts present in the CBSE Syllabus for Class 11 Physics are Thermodynamics, Laws of Motion, Oscillations and Waves.
Anand Technical Publishers
Buy Products (Printed Books & eBooks) of Anand Classes published by Anand Technical Publishers, Visit at following link :
