Proof: Suppose a body undergoes a small displacement ∆x under the action of a conservative force, F. According to work-energy i theorem, change in K.E = work done ∆K = F(x)∆x As the force is conservative the change in j potential energy is given by ∆U = -F (x) ∆x (negative of work done) ∴ ∆K = -∆U ∆K + ∆U = 0 or ∆(K+U) = 0 ⇒ K + U = constant Ki + Ui– Kt+ Ut Although the kinetic energy K and potential energy U may change from one state to another, but their sum (total mechanical energy) remains constant under a conservative force. In physics as well energy is related to work similarly but as already mentioned the definition of the word Work is very precise itself in Physics hence the definition of energy as well. After passing, through a mud will 1 m thick, its velocity decreases to 100 ms-1. Concepts of work, kinetic energy and potential energy are discussed; these concepts are combined with the work-energy theorem to provide a convenient means of analyzing an object or system of objects moving between an initial and final state. Energy is the ability to perform work. Mechanical Energy: The mechanical energy (E) of a body is the sum of kinetic energy (K) and potential en-ergy (U) of the body, ie., E = K + U. Dimensional formulae of work =[F]×[S] = MLT2 L = [ML2T2 ] SI unit of work is Joule (J). For each concept practice enough problems so that you are through with the concept. For a quantity of work W that is done in an amount of time t, the power done is, The unit for power is the Watt (W), which is equal to a Joule per second, 1 W=1 J/s Power can also be expressed in as force F times velocity v. Since work is given by force times distance, W = Fd, and velocity is distance divided by time, v = d/t, then … The unit of Energy is same as of Work i.e. There are different forms of energy like mechanical energy, heat energy, light energy, sound energy, nuclear energy, electric energy etc. If K.E it is inelastic collision. Topics. Q- A person who is trying to lose weight by burning his fats lifts a mass of 10 kg 1000 times up to a height of 1 m. And also assume that the potential energy lost each time he lowers the mass is dissipated. Students of Class 11 can rely on Vedantu as it follows the CBSE board guidelines at the time of the preparation of questions and notes for the examination of Physics. 6) •Finish Newton’s laws and circular motion •Energy • Work (definition) • Examples of work •Work and Kinetic Energy •Conservative and non-conservative forces •Work and Potential Energy •Conservation of Energy A bullet weighing 10g is fired with a velocity of 800 ms-1. Power. What is the relationship of work energy and power? Required fields are marked *. In this live Grade 12 Physical Sciences show we take a close look at Work, Energy & Power. Grade 10. The energy possessed by an object is therefore measured in terms of its capacity of doing work. Furthermore, it tells that the force is conservative is the work done by an object is path independent and depends only on the endpoints. It was very useful I would like to give BYJU’S five stars. In this article you will get CBSE Class 9 Science, chapter notes on Work and Energy. That is energy. Trajectory - Horizontally Launched Projectiles Questions, Vectors - Motion and Forces in Two Dimensions, Circular, Satellite, and Rotational Motion, Calculating the Amount of Work Done by Forces, Analysis of Situations Involving External Forces, Analysis of Situations in Which Mechanical Energy is Conserved, Lesson 1 - Basic Terminology and Concepts. special attention to questions on springs and try similar questions from HCV and Entrance360 site. Excellent explaination done Introduction: In physics, work is done on a body or by a body. Then you should solve questions from NCERT Exemplar book for a good hold on this chapter. Note that the form of energy (K.E and P.E) keeps on changing. By using this website, you agree to our use of cookies. Go through all NCERT basics, the NCERT textbooks are very important and most advisable for understanding theory and it mostly covers the full syllabus. Gravitational force and elastic spring force are conservative forces. For example, a force of 30 newtons (N) pushing an object 3 meters in the same direction of the force will do 90 joules (J) of work. Class 12. You may need to download version 2.0 now from the Chrome Web Store. This theorem states that the work done on the particle due to all types of forces equals to change in kinetic energy of the particles. Power = Rate of doing work = Work done / Time taken. The aircraft casing burns up by friction. Relation between Kinetic energy and Linear momentum CAQ Question 2. Here are some important questions under Class 11 Chapter 6 Physics Notes. Vedantu is the best for giving the finest possible solutions to all the problems of CBSE Physics given in the textbook. activities and was asked in jee main 2016 from this chapter.
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