Work energy and power notes

Plus one physics notes chapter 6 work, energy and power. Average power total work done or total energy usedtotal time taken. Work, energy and power definition, units, formula, examples, types. The greater the capacity of a body to do work, the greater the energy it has.

Work done by all the forces including the pseudo force change in kinetic energy in noninertial frame. Work done by the force is positive if the angle between force and displacement is acute 0 apr 22, 2019 workenergy theorem. Cbse quick revision note for class9 science, chemistry, maths, biology and other subject are very helpful to revise the whole syllabus during exam days. Let us assume the variable force works from position x i to x f then according to the workenergy theorem the change in the kinetic energy is equals to the work done on by the variable force. The rate of converting energy or using energy is known as power. Aug 22, 2017 iii at thermal power house, chemical energy of coal is changed into heat energy, which is futher converted into kinetic energy and electrical energy. Work and energy class 9 notes science mycbseguide cbse. Regarding the workenergy theorem it is worth noting that i if w net is positive, then k f k i positive, i. Work is said to be done only when the force applied on a body makes the body move. Work and energy science class nine cbse subject notes. Where energy transferred by a force doing work, the energy transferred work done by the force. Definition, power can be defined as the rate at which work is done i. Work done by the force is equal to the product of the force and the displacement of the object in the direction of force.

Note that since power is the rate at which work is done, this defines power as the derivative of work with respect to time. Class 11 physics chapter 6 work,energy and power 03 work energy theorem iit jee neet duration. Class 11 physics chapter 6 work,energy and power 04 potential energy iit jee neet. Work done is measured in joules which has symbol j. The best app for cbse students now provides work, energy and power class 11 notes latest chapter wise notes for quick preparation of cbse exams and school based annual examinations. Work, energy and power class 11 notes physics chapter 6. A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all. Concepts of work, kinetic energy and potential energy are discussed. The kinetic energy of an object is a scalar value, meaning it does not depend on the direction the object moves in. The kinetic energy of an object can be related to its mass and velocity with the formula. As physics chapter 10 notes work, energy and power a.

A car moving, a rocket taking off, an aero plane flying, are a few of the events which take place regularly and can give us insight into the concept of work and energy. The work accomplished is equal to the change in potential energy. In this topic we shall deal with these three important concepts of physics. Work, energy and power class 8 science notes khullakitab.

Power is the rate of doing work, average p wt, where t is the. For formulas, see formula for average power, definition of instantaneous power, and formula for. We will also look at power, a practical concept that is derived from work. If applied force f is not a constant force, then work done by this force in moving the body from position a to b will be. Gravitational potential stores kinetic waves thermal stores elastic stores energy can be transferred between different. This topic covers work, energy and power of o level physics. Potential energy the energy of configuration of a conservative system. Physicists mean something very specific when they talk about work. Efficiency of a machine is a ratio of output work to input work. 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 w1 js power can also be expressed in as force f times velocity v. Notes for work, energy and power chapter of class 11 physics. Then the work done by the force is the component of f in the direction of motion.

Power, p work done,w time taken, t or power, p change of energy time taken, t 2. They are probably the first thing you learn in your physics class. When someone picks up an object, energy is transferred from the muscle to the object. An object which can do more work is said to have more energy and vice versa. Class 11 physics chapter 6 work,energy and power 04 potential energy iit jee neet youtube. 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. Work is done on a body when a force on the body makes it move, similarly the body spends energy when it does work. Work done w is defined as the dot product of force f and displacement s.

Work is said to be done when the force is applied on a body and the body covers a certain distance. Jan 19, 2020 this topic covers work, energy and power of o level physics. You can also call it as revision notes for work energy and power or cheat sheet of work energy and. In relation to energy, we can say that work is the amount of energy transferred or transformed, while power is the rate at which this energy is transferred or transformed. Unit of power is the watt w, equal to an energy transfer rate of 1 joule per second. Work, energy and power study material for iit jee askiitians. Work, energy and power gcserevision, physics, forces. The unit of kinetic energy is the same as the unit of work, the joule j. Everybody knows that any type of motion requires energy. The gravitational force and the force to stretch a spring are varying forces. Work, energy and power are the most used terms in physics.

The value of kinetic energy is always positive or zero. This is the name used to describe stored energy that an object has because of its position in this case, higher above the surface of the earth. Cbse class 11 physics notes chapter 6 work energy and power. In these notes a brief and simple explanation of all important topics is given which will help students make an.

Work done by a force in displacing a body is equal to change in its kinetic energy. Selina concise physics class 10 icse solutions work. A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. Use and define the units of work, energy and power. Important notes are also helpful for revision when you have less time and have to study many topics. To register physics tuitions on to clear your doubts. It can also be defined as the rate of change of energy. This energy we get from the food which we eat and if work is done by machine. Class 11 physics revision notes for chapter 6 work, energy. According to einstein, the mass can be transformed into energy and vice versa. Class 11 physics chapter 6 work, energy and power 04 potential energy iit jee neet. We talk about going to work, doing homework, working in class. Jun 14, 2019 work, power and energy class 9 notes here we have provided summary and revision notes for class 9 science chapter 11. Once we have an understanding of work, we can apply it to a new concept, energy, the measure of change within a system, and establish the work energy theorem.

Plus one physics notes chapter 6 work, energy and power a. We at byjus are of the opinion that proper guidance with the right textbooks is essential for students to succeed. Work whenever a force acting on a body produces a change in the position of the body, work is said to be done by the force. To lift an object slowly, a force equal to its weight mg is applied through a height h. The revision notes covers all important formulas and concepts given in the chapter. Overview of work energy and power this chapter is very important because it will test your knowledge of the previous two chapters namely, kinematics, laws of motion and it will be also useful and crucial for you for solving questions from the next chapters namely system of particles, rotational motion and to some extent gravitation. Aug 21, 2019 kerala plus one physics notes chapter 6 work, energy and power. After completion of this lesson, student must be able to. Work done by the force is positive if the angle between force and displacement is acute 0 power power is a rate of doing work. 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. Work done is generally referred in relation to the force applied while. The terms work, energy and power are frequently used in everyday language. If an object undergoes a displacement s along a straight line while acted on a force f. Powerthe power is defined as the work done over a time period or rate of work done is known as the power.

Even if you wish to have an overview of a chapter, quick revision notes are. Work, energy, and power notes for iit jee, download pdf. Work and energy can be considered as two sides of the same coin. Finally, as we begin to explore more complex situations, we will examine work from a calculus standpoint, and. Equivalent to american high school diploma subtopics. Notes for work energy and power this chapter is more of a concept based chapter there is very little to memorize, hence practice is the key here for getting a good hold on this chapter. Jul 25, 2019 work, energy, and power is an important topic from jee main jee advanced exam point of view. Important notes of physics for neet, jee for work energy and power are useful for all aspirants preparing for entrance exams including jee, neet. Class 11 physics chapter 6 work, energy and power 04 potential energy iit jee neet youtube. Every year there are 12 questions asked from this topic. Some questions of this chapter will involve the use of calculus and scalar product of vectors, hence keep your basics strong. Work energy and power work done by force acting on a body is defined as the product of force and displacement of the body in the direction of the force.

For example, a motorcycle has more energy than a bicycle. Workenergy and power class 11 notes thus we have discussed three elementary topics on physics as students would have covered them during their high school days. Thus work, energy and the power are related to each other. What is work energy and power get notes, books, formulas. This section covers work, energy and power using maths. Path independence property of conservative forces which states that the work done on any path between two given points is the same. Interpret the interrelation among work, energy and power with their unit and differentiate them. Cbse class 9 science work energy and power notes set b. In this article, we will learn all about the concept of work, power and energy.

Work, power and energy class 9 notes science chapter 11. Work is done when a force is exerted on an object, and the object moves from one place to another. This note provide us the information about work and its types. Work, energy and power class 11 notes physics mycbseguide. Work, power and energy class 9 notes here we have provided summary and revision notes for class 9 science chapter 11. Class 9 science ncert in pdf chapter 11 work and energy. Selina icse solutions for class 10 physics chapter 2 work, energy and power.

Kerala plus one physics notes chapter 6 work, energy and power. It shows the percentage of output work from the input work. Work, energy and power definition, units, formula, examples. Work, energy and power are some of the more important topics of mechanics in classical physics. This gives us the concept of power or the rate of doing work. Class 11 physics revision notes for chapter 6 work, energy and power free pdf download. Energy is needed to make stationary objects move, change shape and warm them up. Cbse class 11 physics chapter 6 work, energy and power notes in pdf are available for free download in mycbseguide mobile app. Notion of potential energy, potential energy of a spring, conservative forces. Work, energy and power tuesday february 10th reading. Power depends on the time taken and the work done as an analogy, people or engine with high power rating can get the work done in. Objects can possess energy in terms of the following. Suppose a force f acts on a body, causing it to move in a particular direction.

A body which has the capacity to do work is said to posses energy. No machine is hundred percent efficient because there is always energy in the form of heat and sound. K, energy possessed by a body by virtue of its motion. Work, energy and power examples a level maths revision. 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. Physics notes class 11 chapter 6 work, energy and power. A rollercoaster at the top of a slope has stored energy, which is called gravitational potential energy gpe, or sometimes potential energy pe. Power is the rate of doing work or the work done per second. This is the name used to describe stored energy that an object has because of its position in. Nov 29, 2017 in this article you will get cbse class 9 science, chapter notes on work and energy. 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. This is a complete set of notes of work energy and power which is a part of physics syllabus for neet, jee. Mar 16, 2018 cbse class 11 physics chapter 6 work, energy and power notes in pdf are available for free download in mycbseguide mobile app.