Work And Energy Notes Pdf

Energy--Kinetic Energy = 1/2 m*v²; Gravitational Energy = mgh; Elastic Energy = 1/2 k*x²; Dissipated Energy = Work done by friction or other forces. What is Energy? A. Understanding how simple machines function is a big step in understanding. Chapter 7 - Kinetic Energy and Work Kinetic Energy Work Work Examples Power Work Lecture Question 7. an engine) has on its surroundings. External Forces; Analysis of Situations Involving External Forces. • Conductors used for the control, transformation, transmission, and distribution of electric energy. Define the terms work, mechanical energy, potential energy, kinetic energy, and power. Work → For doing work, energy is required. where F is the energy functional and p is the unknow n grid point potential (In mechanics, the potential is displacement. Someone pulls the bottom block to the right with a rope in such a way that both blocks accelerate to the right but no slipping occurs at the interface between the top and bottom blocks. Work, Energy, & Power in Physics Chapter Exam Instructions. Physics (from Ancient Greek: φυσική (ἐπιστήμη), romanized: physikḗ (epistḗmē), lit. and its energy sources locked out and tagged as part of an isolation procedure to ensure the safety of those doing the work. You will have a short time to discuss the problems later in the class period, but your work must be your own. txt) or read online for free. While both work and heat can be measured in terms of joules, they are not measures of energy but rather of energy transfer. 20th lowest energy harmonic oscillator wavefunction. One misconception is that any part of the human body exists in a static state. The Net Work is 15 5 = 10. Work Energy and Power. Nice work to help thanks. FZX, Chapter 6: WORK, ENERGY, and POWER Newton’s laws form a very useful approach for analyzing the question of dynamics -- why something moves as it does, or how it will move in the future. It is customary to use ft-lb for work and lb-ft for moments to avoid confusion. 3 Manuscript Files Accepted. 8 x 103 J) 2. Energy Notes Part 1 23 December 14, 2017 Efficiency Efficiency The efficiency of a machine or device describes the extent to which it converts input energy or work into the intended type of output energy or work. But ω where is the distance between the area and the point where solid angle is formed. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The capacity of doing work is called energy. • Energy transferred to the object is positive work, and energy transferred from the object is negative work. Work Work and energy are the same thing. Physics Class Notes Work and Energy Chapter 6-Work and Energy. The VoltageCurrent, Light and Temperature probes enable students to investigate quantitatively and measure the conversion of one form of energy into another. ELECTROSTATIC ENERGY OF ASSEMBLY OF A POINT CHARGE DISTRIBUTION How much work does it take to assemble a collection of point charges – bringing them in from infinity, one by one? Bringing in the first charge q1 takes NO work (W1 =0), since there is no electric field present, initially. ) Work, Energy, & Power - Very good!. energy efficiency, better comfort, enhanced IAQ, improved equipment reliability, longer equipment life, etc. Brown pushing a desk across the floor. ENTROPY, FREE ENERGY AND EQUILIBRIUM Thermodynamics: Study of energy changes accompanying chemical or physical processes. Many scientists would love access to large-scale computational resources but find that the programming demands of using a supercomputer—as well as the cost and queuing time—ar. Additionally, adherence to the elements in this specification provides intangible societal benefits in the form of reduced power grid energy demand that. Revision Notes on Work, Power and Energy. Converting one form of energy into another form always involves a loss of usable energy. A bimonthly (twice per month) look at the latest astronomy news and what's happening up in the sky that you can see without a telescope. thermodynamics tells us nothing about the mechanisms of energy transfer, rates of change, and time associated with a system changing from one equilibrium state to another, it is still the lynch-pin that allow us to answer these questions. Review of Work: The idea of work was introduced in Physics I as being a measure of the amount of energy transferred to an object, occurring as the result of the object experiencing a displacement (that. •Nuclear Energy - energy locked in the nucleus of the atom. In the English system work is measured in foot-pounds. 3 Work-Energy Theorem When a non-zero net force acts on an object which can be regarded as a point particle, the kinetic energy of the object increases. f UQW J J J UJ nRT T TK TK K K comment 2. 5 kg up a smooth (frictionless) plane inclined at an angle of 30o to the horizontal with a speed of 5. Start studying Science Energy notes. MIT OpenCourseWare is a free & open publication of material from thousands of MIT courses, covering the entire MIT curriculum. How to calculate the energy transfer change for an exothermic reaction. TABLE OF CONTENTS 1. com Early 19th century scientists, Thomas Seebeck and Jean Peltier, first discovered the phenomena that are the basis for today’s thermoelectric industry. We have seen many queries for Class 9 Science notes. Units of Work F d W = + (Ex: pitcher throwing ball) 1 N•m = 1 J (Joule) F d W = - (Ex. potential energy changing into kinetic energy Summarize how energy changes when a log burns. I unit of the work is joule. x graph has dimensions of work and it IS the work done by that force). spring)? W F ax x a F bx x b L F(x)dx x 1 x 2 Integral is geometrically the area under the curve (in this case the area of a F(x) vs. Please report any inaccuracies to the professor. Unbalanced forces = make objects start to move, speed up, slow down, or change direction. What is kinetic energy? 11. If you are pushing with everything you have against an immoveable object, you are not doing any work. 1 Work and Energy (continued) Science Notebook • Work, Energy, and Machines 156 Program: TX HS Science Component: PPP SCI NTBK PDF PASS Vendor: LASERWORDS Grade: N/A 149_162_PPP_SN_C10_666028. The positive work done by the non-conservative force is cancelled by the fact that exactly the same amount of negative work is done by gravity. Chapter 18 Thermodynamics Notes 1 CHAPTER 18. Chemical potential energy can be thought of as the energy held in some substances that can be released through a chemical reaction, such as burning a fuel for heat. Electrons only lose energy when they move to a lower energy state C. You must exert a force of 4. spectrum, the environmental impact of traditional energy production, the cost analysis of the PV system, energy conservation and transformation, the earth/sun energy relationship, and the basic calculations that the students performed during the module. Kinetic energy is energy in motion or doing work. 1 Work and Energy: Energy is needed to make stationary objects move, change shape and warm them up. Forms of Energy Student Notes I. 1 joule work is defined as the amount of work done to cover a distance of 1m in the direction of force when the force of 1N is applied on the body. Potential energy 9. Work done by a variable force. Nuclear power plants split atoms in a process called fission. One form of energy can be converted into another form of energy. It can also be defined as the rate of change of energy. Common notations for potential energy are U, V, and E p. • Mechanical energy ME = KE + PE • Conservation of mechanical energy When nonconservative forces do no work, mechanical energy is conserved: 0 = ∆ (KE + PE) Note: On the microscopic level mechanical energy is always conserved. The graph of velocity Vx versus time t for the cart is given below. You must exert a force of 4. Since the Net Force equals 3 - 1 = 2 Newtons, the Net Work is W net= 2(5) = 10 Joules of work. The purpose of this book is to give readers – in plain language – a fix on the current position of the Smart Grid and its adoption. We can have push-pull work (e. Work and Energy Homework - Due Tuesday, March 6 1) A particle is subject to a force F x that varies with position as in the figure below. 8: Electronic transitions in the Bohr model for the hydrogen atom. W = Fs , Where W= Work, F = Constant Force (N), S = Distance moved in the direction of the force (m). When the turning moment is negative ( i. 1 DEFINITION, SCOPE AND IMPORTANCE 1. Also, Dissipated energy can be found by finding the difference between the initial and final energies. “Photosynthesis” 2 Using the workbook This workbook is designed to provide the student with notes, illustrations, questions and guided examples for the topic of photosynthesis at AQA A2. They were long term visiting scientists at the Neˇcas Center for Mathematical Modeling in the years 2007 and 2008, and. Work, Energy Power Dynamic Viscosity Kinematic Viscosity cgs centimeter gram second dyne erg − poise stoke mks meter kilogram second newton joule watt − − ELECTRIC AND MAGNETIC UNITS The esu and emu unit systems are cgs systems. 1 Alternative Units of Work/Energy in J Example 6. The unit of energy is, therefore, the same as that of work, that is, joule (J). Introduce the fuels or resources needed to produce energy. Energy is defined in science as the ability to do work. This is a theorem, ie a tautology because it is only true by definition of KE and by Newton 2. • Why smaller droplets are not stable and tend to fuse into larger ones?. When a system absorbs heat it absorbs energy, so its energy increases; i. [Please note that the mass and the acceleration due to gravity will not change over time, so they are simply a constant scaling factor. The change in kinetic energy of a body is equivalent to the net work done on the body. In general the nomenclature of BS is used, and much of the notes follow a similar structure as that text. These forms of energies can be used in number of ways. I unit of the work is joule. If an object is standing still, and you get it moving, then you have put energy into that object. It is most certainly not a maximum capacity in any sense: There is no limit on how much thermal energy a substance can absorb. Work-Energy Principle. Welcome! This is one of over 2,200 courses on OCW. 0 t (s) The object starts from the ground and moves vertically. Principle of Work and Energy. Kinetic energy 8. 2 All the forms of energy accompanying mass are designated by the letter E (or e for energy per unit. SI unit of energy. We note that the units of work and moment are the same. These notes help to study well and to score well in exam. Environmental Studies Notes Pdf - ES Notes Pdf. Title: Microsoft PowerPoint - Chapter17 [Compatibility Mode] Author: Mukesh Dhamala Created Date: 4/7/2011 3:41:29 PM. Introduction to Work, Energy, and Energy Resources. In this courseEnergy is the ability to cause work… and WORK is defined as any useful energy transformation …in most kinds of work, one type of energy is transformed into another with some going into a "used form" that no longer has potential for further work Energy…. 19) must be dimensionless and be proportional to the ratio µB/kT. Define work to show its scientific meaning. 00 m, (b) from x = 5. Local Ordinances Exceeding the 2016 Building Energy Efficiency Standards. 3) involves only the derivative of V. In order for work to take place, a force must be exerted through a distance. ) How is the work done by a force calculated? Work done = force × direction moved in direction of the force 7. What is the total work done on the block over the same distance? Finding the work done by the 50 N force is quite simple. The concepts of work and energy are closely tied to the concept of force because an applied force can do work on an object and cause a change in energy. Work transfers energy from one place to another or one form to another. The hierarchy. The stored energy of a bow is determ ined by using the distance it is drawn and some coefficient that depends on the rigidity of the bowstring. These are all a part of. Building Commissioning for New Buildings Building commissioning for new buildings is a quality assurance process to verify and document that building systems. How to calculate the energy transfer change for an exothermic reaction. Physics Work, Energy & Power. Peltier Application Note www. Environmental Studies Notes Pdf – ES Notes Pdf. txt) or view presentation slides online. Net work done results in a change in kinetic energy as per the work-energy theorem. Energy is the capacity of doing work. Notes PHYSICS MODULE - 1 Work Energy and Power Motion, Force and Energy 146 6. Chapter 7 - Kinetic energy, potential energy, work I. on the field. Here is a collection of notes and example problems that I hope will be helpful in learning Engineering Dynamics. The Work-Energy Principle The work done on an object by a net force is W — - Inv net 2 Translational kinetic energy (energy of motion) of an object: he net work done on an object is equal to he chan e in its kinetic ener W > O ICE increases net W < O KE decreases net. This website and its content is subject to our Terms and Conditions. Pay attention to words, examples, and/or diagrams your teacher emphasizes. Doing Work: Work is done whenever a force moves something over a distance. If you are holding a book still in the air, you are not doing work. Some topics may be unclear. Energy and Energy Conservation. The book uses a down-to-earth style and an easy-to-understand language to discuss the work-energy model in a logical manner. Kinetic energy is energy in motion or doing work. This is the final application of integral that we’ll be looking at in this course. S4P-1-27 Describe work as a transfer of energy. goal of these lecture notes to help students in this process of gaining an understanding of, and an appreciation for, fluid motion—what can be done with it, what it might do to you, how to analyze and predict it. Meet Sara, a TeacherVision Teacher "I'm Sara, and I teach high school math and science in Nova Scotia, Canada. We need energy to do work. Conservation of energy is the first of many conservation laws. 2013 OPSPQ April 9, 2013 Results Framework and M&E Guidance Note This guidance notes are intended for internal use by Bank staff. Background These resources were trialled at two workshops that took place in June 2013, and were attended. 1 Energy and Work pages 257–265 page 261 1. Friction at the interface between the two. sbsciencematters. The Electric Field. Energy is the most central concept underlying all sciences. To learn how the Work-Energy Theorem is derived, we must first learn the nature of work as a scalar quantity and how two or more vector quantities are multiplied. The internal energy for any ideal gas can be written as long as the correct C V is used. The stored energy of a bow is determ ined by using the distance it is drawn and some coefficient that depends on the rigidity of the bowstring. Revisiting the work energy theorem The work energy theorem says the total work is equal to the change in KE W net KE 2 KE 1 On the other hand, we have seen that the work due to gravity ONLY DEPENDS ON THE INITIAL AND FINAL POINT OF THEIR PATH, NOT ON THE ACTUAL PATH. ion concentration Battery model Battery capacity and Peukert s law Energy efficiency, battery life, and charge profiles. Thermal Energy –the energy a body possesses due to its temperature and the motion of its particles. Are able to define work and apply the definition to solve problems Revise how draw free body diagrams to find the components of forces Can state and apply the work energy theorem. During this period, the Consultant shall maintain its original Proposal without any change, including the availability of the Experts, the proposed rates and the total price. Deflections using Energy Methods Conservation of energy: 9. 3 Manuscript Files Accepted. Regualer CBSP Update, CBSP Quiz | BTA Certified Blockchain Security Professional Reliable Study Notes - Aojiru-Hikaku. Potential Energy Transforming Into Kinetic Energy Directions: List and describe five examples of potential energy transforming into kinetic energy. If you are sitting in a chair, gravity is not doing any work. In order for work to take place, a force must be exerted through a distance. These notes are only meant to be a study aid and a supplement to your own notes. MECHANICAL PROPERTIES AND PERFORMANCE OF MATERIALS Samples of engineering materials are subjected to a wide variety of mechanical tests to measure their strength, elastic constants, and other material properties as well as their performance under a variety of actual use conditions and environments. Download CBSE class 11th revision notes for Chapter 6 Work, Energy and Power in PDF format for free. A perfect, energy efficient machine would change all the energy put in it into useful work—a technological impossibility today. • By making the chair move, you increase its kinetic energy. That is it only depends on the endpoints and not the path. Candidates who are pursuing in Class 09 are advised to revise the notes from this post. Guidance Note QGN 02 – Isolation of plant, Department of Natural Resources, Mines and Energy, 2019 6 4. Samar Hathout ; KDTH 101; 2 Work Work is the transfer of energy through motion. Free Notes for 4th Class Science Work, Force and Energy. Energy The kinetic energy (K) of an object is equal to the amount of work that is required to accelerate the object from rest to a certain velocity, v. Concept of Energy a. The falling mass raising a lever. S4P-1-29 Derive the equation for kinetic energy using and kinematics equations. 5mv2 The SI unit for kinetic energy is the Joule (J). This PDF file contains hand written notes on Work Power Energy that will help you revise quickly, refer to solved previous year questions and help score more marks in JEE Mains / Advanced exams. Humans have a well-defined internal clock that shapes our energy levels throughout the day: our circadian process, which is often referred to as a circadian rhythm because it tends to be very regular. Now we will be concerned with two scalar quantities, work & energy and how they are always conserved or remain constant. Not a new law Work energy theorem (baby version). Work, Kinetic Energy and Potential Energy 6. 50 kg cart moves on a straight horizontal track. Energy is the capacity of doing work. Kinetics of Particles: Work and Energy Conservation of Energy •During the motion, only transformation of KE into PE occurs and it can be vice versa A ball of weight W is dropped from a height h above the ground (datum). The Net Work is 15 5 = 10. ! = work function: amount of energy binding the electron to the metal Recall that E=hf gives the energy of the photon. •Nuclear Energy - energy locked in the nucleus of the atom. Different things can happen due to different forms of energy. Then the work done by the force is the component of F in the direction of motion × the distance the body moves as a result. Here θ is the angle between and. 8 x 103 J) 2. Thus the unit of work is the N - m. I unit of the work is joule. (a) Indicate every time t for which the cart is at rest. We cannot say a body “has” a certain amount of heat any more than we can say a body “has” a certain amount of work. There are many more useful educational material which the students can download in pdf format and use them for studies. *All project activities were planned and developed by teachers working together, and the main reason they are disseminated is to encourage teachers to work effectively with each other inside and outside the classroom. Energy and Energy Conservation. Pre-work Prior to coming to class, have students complete the "energy audit" for at least two days (see appendix A). Welcome to our digital delivery English Language e-manual, e-informational, e-book, e-course, PDF and mp3 web store! Over 5,000 selections. Offline Access Help Center. How much work is done by a boy weighing 800 N in climbing 6. and K f = final kinetic energy. We can have push-pull work (e. The note starts by providing a background of the situation covering the various issues which the city currently faces and how the problems can be solved by implementing the change. Physics 1st Year Notes of Chapter 4 Work and Energy PDF Download Download notes of Physics 1st year notes of chapter work and energy pdf download for free stay connected to get latest updates of my blog. Choose the one alternative that best completes the statement or answers the question. The bigger the force or distance, the greater the work. Stored or gained work. energy, it is possible to transform it. (Paper) CBSE Class IX Model Test paper - Work And Energy. For instance. You squeeze a spring, i. Work, Energy, and Power is an important topic from JEE Main / JEE Advanced Exam Point of view. Remember for work to be done there must be movement. A moving car, walking up stairs, lifting heavy objects, an airplane flying, etc are among the most common examples that give us insight into the concept of work, power, and energy. Along the way, we'll talk about work, kinetic energy, potential energy, conservation of energy, and mechanical advantage. This value can be determined by calculating the area under the the force-extension graph. “Photosynthesis” 2 Using the workbook This workbook is designed to provide the student with notes, illustrations, questions and guided examples for the topic of photosynthesis at AQA A2. Work=W= Force parallel x Displacement We will think of work as being force times displacement. Environmental Studies Pdf Notes – ES Pdf Notes. PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET. Work, Energy and Power Motion of System of Particles and Rigid Body To note the change in level of liquid in a container on heating and interpret the observations. /ICS MUST DOWNLOAD AND STUDY FOLLOWING NOTES TO ENSURE A+ GRADE. Friction at the interface between the two. Doesn't work for atoms larger than hydrogen (more than one electron) 2. Chapter 4 Work, energy, and power By Liew Sau Poh 2 Outline 4. These notes are prepared by some of the highly expert teachers. When one object does work on another, energy is transferred. Chapter 6: Work, Energy and Power Tuesday February 10th Reading: up to page 88 in the text book (Ch. In the absence of energy losses, such as from friction, damping or yielding, the strain energy is equal to the work done on the solid by. Keywords: efficiency, energy, gravitational potential energy, kinetic energy, power, work, conservation of mechanical energy, change in. Chapter 18 Thermodynamics Notes 1 CHAPTER 18. Concept of energy is unknown to Isaac Newton. Lecture Notes - D. WORK, ENERGY AND POWER 117 ⊳ Table 6. 19 ELECTRIC POTENTIAL AND ELECTRIC FIELD Potential energy accounts for work done by a conservative force and Note also that as a battery is discharged, some. The formative assessments such as the lab, the compare/contrast. Find materials for this course in the pages linked along the left. Additionally, adherence to the elements in this specification provides intangible societal benefits in the form of reduced power grid energy demand that. 9 Science notes Chapter 11 Work and Energy. AQA KS3 physics 3. You must enable JavaScript in order to use this site. Work-Energy Theorem. Moving people. CBSE Class 9 Science Notes: Work and Energy. an electric motor), chemical work, surface tension work, elastic work, etc. External Forces; Analysis of Situations Involving External Forces. Mechanics, Basic Concepts. If there is no displacement, there is no work done. The amount of work done depends on two things the amount of force exerted and the distance over which the force is applied. – Also note that the external work is. Thus, the SI unit of energy is joule and is denoted. Find materials for this course in the pages linked along the left. ppt), PDF File (. Note that shifting the potential by a given constant has no efiect on the equation of motion, because eq. They combine material from Hand and Finch (mostly), Thornton, and Goldstein, but cover the material in a different order than any one of these texts. x Icse Physics Note-4 Work, Energy & Power - Free download as PDF File (. Its existence was still debated in the 1850s. Pre-work Prior to coming to class, have students complete the "energy audit" for at least two days (see appendix A). A summary of system types and components is given so the builder will know what to expect to see in a design submitted by a subcontractor or PV designer. In addition, Abbott and van Ness’s. Thus, the first object had a capacity to do work. This wavefunction shows clearly the general feature of harmonic oscillator wavefunctions, that the. com to clear your doubts. One form of energy can be converted into another form of energy. 6 (a) Energy. Energy produces motion. Assume that the mass Of the arms and collars is negligible. Physics Work and Energy Worksheet Solutions Part I 1. How fast work is done. Work is defined as the change in the level of energy of a system, so it is also measured in Joules. Consider two blocks stacked one above the other on a table. NMJ Lecture Notes 6 4. Thus, it is often easier to solve problems using energy considerations instead of using Newton's laws (i. AQA KS3 physics Know. As a result of the friction heat energy is given off. The Net Work is 15 5 = 10. The steam flows over and turns the turbine. Thermal energy cannot be converted to useful work as easily as the energy of systems that are not in states of thermodynamic equilibrium. • By making the chair move, you increase its kinetic energy. iwapublishing. For a conservative force Work done between two points is independent of the path Work done in a closed loop is zero And $-W=U_f-U_i$ So for positive work potential energy decreases So a and b are correct Question 3. Notes from class: Check out the Physics Files page for PowerPoint notes from class. Work, like energy, is measured in joules. 1 Alternative Units of Work/Energy in J Example 6. The work-kinetic energy theorem equates the net force (gravity, friction, air resistance, etc. energy from steam and converted linear reciprocating motion to rotary motion, to provide shaft power for industry. 3 Work, Energy and Power Work and Kinetic Energy 2. were in an electronic state just above the vacuum level). A machine that exploits wave power is a wave energy converter (WEC). Course 1 Frogs Course 2 Leopards Course 3 Owls. energy associated with the deformation of the rod. You can also buy these notes. Chemical energy stored by molecules can be released as heat during chemical reactions when a fuel like methane, cooking gas or coal burns in air. 1 The Important Stuff 6. Revisiting the work energy theorem The work energy theorem says the total work is equal to the change in KE W net KE 2 KE 1 On the other hand, we have seen that the work due to gravity ONLY DEPENDS ON THE INITIAL AND FINAL POINT OF THEIR PATH, NOT ON THE ACTUAL PATH. _____ System. Welcome to our digital delivery English Language e-manual, e-informational, e-book, e-course, PDF and mp3 web store! Over 5,000 selections. Every year there are 1-2 questions asked from this topic. pdf: File Size: 5603 kb: File Type: pdf. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 9 Physics Work and Energy. Kinetic Energy, and the Work Energy Principle Problem 6-25 (textbook): A 285-kg load is lifted 22. WORK & ENERGY So far, we've been obsessed with motion and how it relates to Newton's Laws and forces. The terms 'work', 'energy' and 'power' are frequently used in everyday language. a (The mass that loses the least energy to friction will have the most (kinetic) energy and velocity at the bottom of the incline (see previous questions)) 11. If an object is standing still, and you get it moving, then you have put energy into that object. 3 A cyclist comes to a skidding stop in 10 m. Energy is defined as the ability to do work. notebook 7 November 22, 2013 Momentum & energy conservation in collisions Both momentum and total energy are conserved in any collision. Answer 5 P = IV Energy dissipated by an electrical resistance is usually manifest as heat, although sometimes it is. Now we will be concerned with two scalar quantities, work & energy and how they are always conserved or remain constant. 1 Kinetic Energy For an object with mass m and speed v, the kinetic energy is defined as K = 1 2 mv2 (6. ) I should point out that the term “specific heat capacity” is in some ways a misnomer. The definition is correct, of course, but it is. =−∫ 2 1 v v wrev PdV. Mathematically, Work done= Force * Distance. project in Electrical Engineering Department of Nat ional Institute of Technology, Rourkela is an. The work-kinetic energy theorem relates work to the change in kinetic energy: WKKnet f i=−. You can see some Work and Energy, Chapter Notes, Class 9, Science sample questions with examples at the bottom of this page. Motion 1-D Lecture Notes [pdf] Class Worksheets. Formative Assessments. physics formulas work and energy physics power formulas physics work and energy formula sheet energy of propagation water wave physics formula formulas in work,energy and physics energy+cheatsheet formulas work and energy formulas on work, power and energy physics formulas on work power and energy physics work energy power problems. The Curriculum Corner contains a complete ready-to-use curriculum for the high school physics classroom. Download revision notes for Work and Energy class 9 Notes and score high in exams. The theory presented here is based on Ref. Download PDF Notes. Work-Energy Theorem The kinetic energy is dened as K = 1 2 mv2 The work done by the net force on the system equals the change in kinetic energy of the system Wnet = Kf Ki = K This is known as the work-energy theorem Units of K and W are the same (joules) Note: when v is a constant, K = 0 and Wnet = 0, e. So we need to get started now.