In this Physics video lecture on ‘H C Verma Solutions’ for class 11, IIT JEE in Hindi we solved a problem on ‘Newton’s Laws of Motion’ ( chapter 5 ) from the book “Concepts of Physics” by H C Verma. This video lecture is solution of Exercise 12.
Newton’s first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia. The key point here is that if there is no net force acting on an object (if all the external forces cancel each other out) then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. If an external force is applied, the velocity will change because of the force.
Newton’s second law explains how the velocity of an object changes when it is subjected to an external force. The law defines a force to be equal to change in momentum (mass times velocity) per change in time. Newton also developed the calculus of mathematics, and the “changes” expressed in the second law are most accurately defined in differential forms. (Calculus can also be used to determine the velocity and location variations experienced by an object subjected to an external force.) For an object with a constant mass m, the second law states that the force F is the product of an object’s mass and its acceleration a:
F = m * a
Newton’s third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal force on object A.
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The question follows :
A block of mass 2 kg placed on a long frictionless horizontal table is pulled horizontally by a constant force F. It is found to move 10 m in the first two seconds. Find the magnitude of F.
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This video lecture is very helpful for class 11 and IIT JEE aspirants. ” Concepts of Physics ” by H C Verma is one of the most recommended books in Physics for the preparation of IIT JEE and other competitive examinations.
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About H C Verma :
Harish Chandra Verma (born 3 April 1952) is an Indian experimental physicist and a professor at the Indian Institute of Technology Kanpur since 1994. His field of research is nuclear physics.
H. C. Verma spent most of his childhood in Patna. He was trained with basic arithmetic by his father Shri Ganesh Prasad Verma, who was a teacher. After he graduated high school, he entered Patna Science College. In Patna University, he received a B.Sc. (Honours) degree in Physics. From 1975 to 1977, Verma joined the IIT Kanpur for a M.Sc. and was placed as a top student with a performance index of 9.9 out of 10.0. He then chose to remain at IIT Kanpur for his doctorate. Verma received a PhD degree in less than three years.
Dr. Verma joined IIT Kanpur in 1994 as assistant professor. Here, he taught many courses, guided M. Sc. and PhD students, authored a book “Quantum Physics”, and pursued research in experimental nuclear physics. While at IIT Kanpur, apart from his regular assignments, he took many socio-educational initiatives for the benefit of education and society. Some of these initiatives are School Physics Project, Siksha Sopan, and Utsahi Physics Teachers.
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