It explains how to calculate the average power exerted by a constant force on an object given the initial. Then the work done by the force is the component of f in the direction of motion. Chapter 6 work, kinetic energy and potential energy. We know that all the cars kinetic energy is lost to friction. Learn science work power formulas with free interactive flashcards. Work energy and power conservation of energy collisions notes in. In electrical or mechanical these three terms work, energy, power are most important. I will start the video by discussing calculation of dot product of two vectors and how we can find the angle between two vectors by. Free pdf download of physics class 11 chapter 6 work, energy and power formula prepared by subject expert teacher at vedantu. 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. For an object of mass m, moving with velocity of magnitude v, this energy can be calculated from the formula. Work done by the force is positive if the angle between force and displacement is acute 0 oct 01, 2017 this physics video tutorial provides a basic introduction into power, work, and energy. Work done by the force is equal to the product of the force and the displacement of the object in the direction of force. Define work, energy and power energy is defined as capacity to do work.
As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time. If we know the power in watts of an appliance and how many seconds it is used we can calculate the number of joules of electrical energy which have been converted to sortie other. Relationship between work, energy and power electrical4u. Work and kinetic energy formula, definition, equation, videos. Can work be expressed in terms of the kinetic energy of an object and vice versa. In the equation the mass is measured in kilograms and speed in ms. This section covers work, energy and power using maths. When force is constant, work can simply be calculated using the equation. Work, springs, kinetic energy, and power capa homework due friday at 10pm midterm long answers have been graded and will be uploaded before recitations. Choose from 500 different sets of science work power formulas flashcards on quizlet. Scribd is the worlds largest social reading and publishing site.
It is measured by the product of the force and the distance moved in the direction of the. Work, energy and power definition, units, formula, examples. Energy the capability of doing work is called energy. Work energy and power conservation of energy collisions notes in pdf physical definition work.
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. Cbse class 11 physics chapter 6 work, energy and power. 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. Mar 24, 2019 here are complete work energy and power important notes and summary. Workenergy theorem work, energy and power siyavula. Underneath are some solved samples on power which help comprehend these formulas. Work, energy and power definition, units, formula, examples, types.
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. This summarizes most important formulae, concepts, in form of notes of work energy and power which you can read for jee, neet preparation. Work formula example of work types of energy power formula questions. Introduction to power, work and energy force, velocity. 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. The unit of energy is the joule, the unit of power is the watt, and the unit of time is the second. Therefore, the change in the cars kinetic energy is equal to the work done by the frictional force of the cars brakes. Aug 23, 2016 work is done when a force moves the object in the direction of the force and is given by the product of the force and the distance moved in the direction w fs, where w work, f constant force n, s distance moved in the direction of the force m.
Work done is generally referred in relation to the force applied while energy is used in reference to other factors such as heat. Suppose a force f acts on a body, causing it to move in a particular direction. The kinetic energy of an object is a scalar value, meaning it does not depend on the direction the object moves in. Register online for physics tuition on to score more marks in your examination. All electrical engineer must know what is work, energy and power and their real definition. 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. Chapter 7 kinetic energy, potential energy, work i. If youre seeing this message, it means were having trouble loading external resources on our website. The energy of a moving object is called kinetic energy. The work done to raise the elevator was 950000 joules, and the time interval was 50 seconds. 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.
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. Work, power, and energy are among the most important concepts of mechanics. Someone study very hard in his study room to get good marks. This relationship between kinetic energy and work is called the work energy theorem. Important questions for cbse class 11 physics chapter 6. This physics video tutorial provides a basic introduction into power, work, and energy. This definition can be extended to rigid bodies by defining the work of the torque and rotational kinetic energy. Energy transformed work done applied force x distance. In this video, we will revise the topic work, energy and power. The power required to raise the elevator was 19000 watts, which is equal to 19 kw.
Formula of work is wfxs f force in newton s displacement in meters. Work energy and power physics notes get depth knowledge of work energy and power chapter including formulas, equations, definition, books, practice questions, preparation plan and more. By now, we have started to sense that work and kinetic energy are closely related. Work, energy and power are some of the more important topics of mechanics in classical physics. Regarding the workenergy theorem it is worth noting that i if w net is positive, then k f k i positive, i. Work, energy and power tuesday february 10th reading. What is work energy and power get notes, books, formulas. You have provided all information about work, energy, and power. In physics, we can define energy as the capacity to do work. Equivalent to american high school diploma subtopics. Physics notes class 11 chapter 6 work, energy and power. Feb 09, 2017 in this video, we will revise the topic work, energy and power. This topic covers work, energy and power of o level physics. Nov 08, 2017 work, power and energy general knowledge work, power, and energyrelated important general knowledge and basic concept with the definition for upse, ias, ssc cgl, mts, railway, banking, and other competitive exams.
Work, energy and power study material for iit jee askiitians. Work is said to be done when a force applied to an object moves that. 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. Define work, energy and power work is defined as product of the force and displacement of an object in the direction of force. If we are using one kw of power, a kwh of energy will last one hour. These notes are prepared by some of the highly expert teachers. For formulas, see formula for average power, definition of instantaneous power, and formula for. An electric machine makes use of 300 j of energy to do work in 10s. Power is defined as the rate at which work is done or the rate at which energy is transfered to or from a system. The power formula is made use of to compute the power, resistance, voltage or current in any electrical circuit. 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. During this process, the force on the cycle due to the road is 200 n and. If you provide more examples and problems on work, energy, and power.
Mathematically, it is computed using the following equation. For example, potential energy in the compressed spring, kinetic energy in the moving object, electromagnetic energy and heat are some of them. Free pdf download of important questions with solutions for cbse class 11 physics chapter 6 work, energy and power prepared by expert physics teachers from latest edition of cbsencert books. Concepts of work, kinetic energy and potential energy are discussed. In other words, power is a measure of how quickly work can be done. Work, energy and power formula list and important points. Work done by a force in displacing a body is equal to change in its kinetic energy. In general sense, work means any kind of physical and mental activity. Cbse class 11 physics notes chapter 6 work energy and power. Work energy principle the work done on an object is equal to its change in kinetic energy.
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