One example is the work required to stretch a spring. Then the work done by the force is the component of f in the direction of motion. Feb 09, 2017 work, energy and power formula list and important points in this video, we will revise the topic work, energy and power. Class 11 physics revision notes for chapter 6 work. Energy, work and power units conversion smps power. Work, energy and power class 11 notes physics chapter 6 work is said to be done when a force applied on the body displaces the body through a certain distance in the direction of applied force. In this unit we will deal with mechanical energy of the substances. Kinetic energy of an object increases with its speed. If positive work is done, then the object will gain energy. These notes are prepared by some of the highly expert teachers. An electric stove consumes 5 mj of energy from a 230 v power supply when turned on in 60 minutes. Work, energy and power tuesday february 10th reading. The terms work, energy and power are frequently used in everyday language.
Important notes are also helpful for revision when you have less time and have to study many topics. Cbse class 11 physics work, energy and power formulas. A collision in which the total kinetic energy of the system is conserved is called elastic. Work energy and power conservation of energy collisions notes in. For formulas, see work done by a constant force parallel to displacement and work done by any constant force, and work done by a positiondependent force. Concepts of work, kinetic energy and potential energy are discussed. Free pdf download of physics class 11 chapter 6 work, energy and power formula prepared by subject expert teacher at vedantu. Power is the rate at which work is done or energy is transformed. Power is the rate of doing work or the rate of using energy. Workenergy theorem work, energy and power siyavula. Work done by the force is positive if the angle between force and displacement is acute 0 work can be used to understand the energy of many objects that experience forces. Solved examples on work, power and energy study material for. Physics 0302 potential energy and conservative forces. Along the way, well talk about work, kinetic energy, potential energy, and conservation of energy.
Suppose a force f acts on a body, causing it to move in a particular direction. There are many forms of energy, each involving both kinetic and potential energy. Work is defined as the product of force and displacement in the direction of force. Dimensions of power linear momentum of an isolated system is always conserved in a collision. Jun 14, 2019 work, power and energy class 9 notes here we have provided summary and revision notes for class 9 science chapter 11. The energy dissipated in 60 seconds can be calculated. Work done w is defined as the dot product of force f and displacement s. Work, energy and power physics neet class topperlearning. This section covers work, energy and power using maths. Physics notes class 11 chapter 6 work, energy and power work when a force acts on an object and the object actually moves in the direction of force, then the work is said to be done by the force. Work of a constant force force is parallel to displacement work of force of friction w f x cos w f x w ffric x kinetic energy 2 2 1 ek mv gravitational potential energy near a planet surface ep m g h gravitational potential energy r m m ep g elastic potential energy 2 2 1 ep k x. The faster the pendulum bob moves, the greater its kinetic energy. Class 11 physics revision notes for chapter 6 work, energy. Work, energy and power in this section of the transport unit, we will look at the energy changes that take place when a force acts upon an object.
Note if power is more, work is done fast and vice versa. Distance, velocity, momentum, force, pressure, work and. This is a complete set of notes of work energy and power which is a part of physics syllabus for neet, jee. The power rating energy per unit time of the stove can be calculated as. Energy in general is defined as the capacity for doing work. Learn science work power formulas with free interactive flashcards.
Work done by the force is equal to the product of the force and. In calculating the change in the kinetic energy of the system during motion, one ignores the magnetic force of one on another. A farmer clearing weeds in his field is said to be working hard. Physics 0303 nonconservative forces and conservation of energy. Joule the units of work, equivalent to a newtonmeter. Work formula example of work types of energy power formula questions. During this process, the force on the cycle due to the road is 200 n and. Download work energy power problems with solutions.
If negative work is done, then the object will lose energy. Calculate the work done by a 47 n force pushing a pencil 0. Energy energy is the quantity that can be used to perform work. Physics notes class 11 chapter 6 work, energy and power. Distance, velocity, momentum, force, pressure, work and energy. You can also call it as revision notes for work energy and power or cheat sheet of work energy and. Work, energy and power formulae work of a constant force. Potential energy is stored energy due to a systems shape, position, or state.
The bigger unit of power is kilowatt and represented by kw. The engine of your motorcycle works under this principle. Work is said to be done when a force applied to an object moves that. Chapter 6 work, kinetic energy and potential energy. Work and kinetic energy formula, definition, equation, videos. If youre seeing this message, it means were having trouble loading external resources on our website. Force, work, energy and power pearson schools and fe colleges. In a drought affected region she may be required to carry it over large. Work done by the force is equal to the product of the force and the displacement of the object in the direction of force. I will start the video by discussing calculation of dot product of two. Work can be used to understand the energy of many objects that experience forces.
If the magnitude of the displacement of the object is labeled x, and this represents the displacement away from an equilibrium position x 0, then the force required to pull the object on the spring to a. Work, energy and power definition, units, formula, examples, types. Derive an equation for the potential energy of a spring, using hookes law and a forcedisplacement graph. Work, power, and energy are among the most important concepts of mechanics. A moving car, walking up stairs, lifting heavy objects, an aeroplane flying, etc are among the most common examples that give us insight into the concept of work, power, and energy. If youre behind a web filter, please make sure that the domains. We can calculate work by multiplying the force by the movement of the object.
Power is defined as the rate at which work is done or the rate at which energy is transfered to or from a system. Kinetic energy is energy associated with motion, whether in a straight line of a circle. Using the estimates of kinetic energy from problem 3, calculate the efficiency energy in vs. But most of the problems where we need to calculate the work done by a force will just involve eqs. Work done is measured in joules which has symbol j. Power can also be defined as the rate of transfer of energy.
When the point of application of force moves in the direction of the applied force under its effect then work is said to be done. Work, energy and power class 11 physics india science. This article deals with the summary of work, power and energy, formulas and how they are related to each other in a crux form which not only clear your concepts but also help in your preparation. This is because the object experiences an acceleration and therefore a change in velocity. Work done is generally referred in relation to the force applied while energy is used in reference to other factors such as heat. Work, power and energy class 9 notes science chapter 11. So if we have a constant force of magnitude f newtons, which moves a. To calculate the work done on an object by a force. In grade 10, you saw that mechanical energy was conserved in the absence of nonconservative forces. In other words, the work done on an object is the change in its kinetic energy.
Choose from 500 different sets of science work power formulas flashcards on quizlet. Although casually the terms energy and power are often used interchangeably, we see that technically they have different meanings. Energy cant be created or destroyed, it can only be changed from one type into another type. Work energy and power conservation of energy collisions notes in pdf physical definition work. Jul 24, 2018 class 11 physics chapter 6 work, energy and power 03 work energy theorem iit jee neet duration. The various forms of energy are potential energy, kinetic energy, heat energy, chemical energy, electrical energy and light energy. When a net force does work on an object, then there is always a change in the kinetic energy of the object. Class 11 physics chapter 6 work,energy and power 03 work energy theorem iit jee neet duration. Regarding the workenergy theorem it is worth noting that i if w net is positive, then k f k i positive, i. The ratio of the kinetic energy gained to the work put in to lifting the cars is the efficiency kegpe of the system. This cbse notes contains cbse key notes, cbse revision notes, short key notes, images, diagrams of the complete chapter 11 titled work, power and energy of science taught in class 9.
Work done by a force in displacing a body is equal to change in its kinetic energy. Power is the rate of doing work, average p wt, where t is the. For example, potential energy in the compressed spring, kinetic energy in the moving object, electromagnetic energy and heat are some of them. Energy transformed work done applied force x distance. The gravitational force and the force to stretch a spring are varying forces. When the pendulum is released, the potential energy is converted into kinetic energy as the pendulum bob descends under the i nfluence of gravity. A woman carrying water from a well to her house is said to be working. Work done by the force is positive if the angle between force and displacement is acute 0 work, energy and power formulae. Work and kinetic energy formula, definition, equation. There are two types of energy, kinetic and potential.
Energy, work and power units conversion smps power supply. This oer repository is a collection of free resources provided by equella. Energy the capability of doing work is called energy. Work, energy and power class 11 notes physics chapter 6. Answers, with formula when needed will be recorded on the whiteboards at each team table. Mar 24, 2019 important notes of physics for neet, jee for work energy and power are useful for all aspirants preparing for entrance exams including jee, neet. Here, youll learn about how its one of the most useful concepts in physics. Work energy and power conservation of energy collisions. Work, energy and power definition, units, formula, examples. Since work done tells us how much energy is transferred by a force, both work. The force and the displacement must be parallel to one another in order for work to be done. Energy the capacity of a body to do work is called the energy of the body. Problem set overview this set of 32 problems targets your ability to use equations related to work and power, to calculate the kinetic, potential and total mechanical energy, and to use the work energy relationship in order to determine the final speed, stopping distance or final height of an object.
This is the workenergy theorem or the relation between kinetic energy and work done. Cbse class 11 physics notes chapter 6 work energy and power. It is important to know whether a force is an conservative force or an nonconservative force in the system, because this is related to whether the force can change an objects total mechanical energy when it does. Work energy power packet key mayfield city schools. Kinetic energy is energy associated with motion, whether in a straight line of a. During this process, the force on the cycle due to the road is 200 n and is directly opposed to the motion. Class 11 physics revision notes for chapter 6 work, energy and power free pdf download. In other words, the work done is equal to the change in k. Important notes of physics for neet, jee for work energy and power are useful for all aspirants preparing for entrance exams including jee, neet. It is measured by the product of the force and the distance moved in the direction of the force, i. To register online physics tuitions on to clear your doubts from our expert teachers and solve the problems easily to score more marks in your cbse class 11 physics exam.
1062 1381 500 1571 972 176 1196 426 417 929 979 442 598 1530 692 1283 784 429 1198 1452 1053 132 699 1365 399 124 1366 814 169 927 1176 1377 1183 1365 1315