Work done by the force is equal to the product of the force and the displacement of the object in the direction of force. Chapter 6 work, kinetic energy and potential energy. Cbse class 11 physics work, energy and power formulas. Distance, velocity, momentum, force, pressure, work and.
Power is the rate of doing work or the rate of using energy. A collision in which the total kinetic energy of the system is conserved is called elastic. A woman carrying water from a well to her house is said to be working. When the pendulum is released, the potential energy is converted into kinetic energy as the pendulum bob descends under the i nfluence of gravity. To find the work done on the car, we just need to figure out how much energy was given to the car. Distance, velocity, momentum, force, pressure, work and energy. Power force multiplied by displacement divided by time p f.
The faster the pendulum bob moves, the greater its kinetic energy. In a drought affected region she may be required to carry it over large. Energy, work and power units conversion smps power supply. We can calculate work by multiplying the force by the movement of the object. Work done by the force is positive if the angle between force and displacement is acute 0 work, energy and power formulae. 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. Important notes are also helpful for revision when you have less time and have to study many topics. Jul 24, 2018 class 11 physics chapter 6 work, energy and power 03 work energy theorem iit jee neet duration.
Imagine you are pushing a heavy box across the room. 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. Free pdf download of physics class 11 chapter 6 work, energy and power formula prepared by subject expert teacher at vedantu. Where w is work, f is force, and s is the displacement of the object due to the force. Work and kinetic energy formula, definition, equation.
Physclips ch 7 definition of work definition of kinetic energy. Work, energy, and power equations flashcards quizlet. Energy cant be created or destroyed, it can only be changed from one type into another type. It is measured by the product of the force and the distance moved in. You can also call it as revision notes for work energy and power or cheat sheet of work energy and.
Energy energy is the quantity that can be used to perform work. Power can also be defined as the rate of transfer of energy. The engine of your motorcycle works under this principle. 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. Choose from 500 different sets of science work power formulas flashcards on quizlet. 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. I will start the video by discussing calculation of dot product of two. In grade 10, you saw that mechanical energy was conserved in the absence of nonconservative forces. Thus, we define the kinetic energy as the capacity of an object to do work by virtue of its motion. Work, energy and power class 11 notes physics chapter 6. Important notes of physics for neet, jee for work energy and power are useful for all aspirants preparing for entrance exams including jee, neet. 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.
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. Work is said to be done when a force applied to an object moves that. Using the estimates of kinetic energy from problem 3, calculate the efficiency energy in vs. During this process, the force on the cycle due to the road is 200 n and. Energy the capability of doing work is called energy. Work, energy and power definition, units, formula, examples. Use these products to increase your mental and physical energy whenever you need a boost. Where w is work, f is force, and s is the displacement of the object due. If we are using one kw of power, a kwh of energy will last one hour. 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. Work and kinetic energy formula, definition, equation, videos. If positive work is done, then the object will gain energy. Learn science work power formulas with free interactive flashcards.
The power rating energy per unit time of the stove can be calculated as. From mild energy boosters like ginseng and bee pollen to intense energy drinks, heres where youll find a full range of energyenhancing products. This is because the object experiences an acceleration and therefore a change in velocity. Solved examples on work, power and energy study material for. Kinetic energy is energy associated with motion, whether in a straight line of a circle. Dimensions of power linear momentum of an isolated system is always conserved in a collision. Although casually the terms energy and power are often used interchangeably, technically they have different meanings. The force and the displacement must be parallel to one another in order for work to be done. Energy transformed work done applied force x distance. 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 done by the force is positive if the angle between force and displacement is acute 0 power power is a rate of doing work.
Along the way, well talk about work, kinetic energy, potential energy, and conservation of energy. 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. The rate at which energy is transferred is called power and the amount of energy that. Energy in general is defined as the capacity for doing work. Kinetic energy of an object is its capacity to put another object in motion. In other words, the work done is equal to the change in k. During this process, the force on the cycle due to the road is 200 n and is directly opposed to the motion. We can find the power output by the engine by taking the work done on the car divided by the time it took to do that work. These notes are prepared by some of the highly expert teachers. 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.
Mathematically, it is computed using the following equation. Class 11 physics chapter 6 work,energy and power 03 work energy theorem iit jee neet duration. Suppose a force f acts on a body, causing it to move in a particular direction. Hvac formulas ton of refrigeration the amount of heat required to melt a ton 2000 lbs. In other words, power is a measure of how quickly work can be done. Physics notes class 11 chapter 6 work, energy and power. Work done w is defined as the dot product of force f and displacement s. This section covers work, energy and power using maths. Then the work done by the force is the component of f in the direction of motion. Here, youll learn about how its one of the most useful concepts in physics. If negative work is done, then the object will lose energy. Work formula example of work types of energy power formula questions. 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.
Measured in joules 1j 1nm 1 kgm2 s2 w fcos theta s. Work, energy and power definition, units, formula, examples, types. In this case, the car was given kinetic energy and it took two seconds to give it that kinetic energy. Energy is a key principle in physics, as it allows work to be done. Work, power and efficiency work, power and efficiency. The energy dissipated in 60 seconds can be calculated. The ratio of the kinetic energy gained to the work put in to lifting the cars is the efficiency kegpe of the system. Joule the units of work, equivalent to a newtonmeter. There are many forms of energy, each involving both kinetic and potential energy. Work, power, and energy are among the most important concepts of mechanics.
Work done is generally referred in relation to the force applied while energy is used in reference to other factors such as heat. Undistorted powerful sound is not found in these formulas. Work can be used to understand the energy of many objects that experience forces. One example is the work required to stretch a spring. The bigger unit of power is kilowatt and represented by kw. This is the workenergy theorem or the relation between kinetic energy and work done. Work, energy and power tuesday february 10th reading. Work done is measured in joules which has symbol j.
Voltage current resistance and electric power general basic. An electric stove consumes 5 mj of energy from a 230 v power supply when turned on in 60 minutes. Energy, work and power units conversion smps power. Work, energy and power physics neet class topperlearning. For example, potential energy in the compressed spring, kinetic energy in the moving object, electromagnetic energy and heat are some of them. In other words, the work done on an object is the change in its kinetic energy.
Work is the product of force and the distance over which it moves. Also, we know that when an object in motion strikes a stationary object, it can cause it to move. A farmer clearing weeds in his field is said to be working hard. 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. The terms work, energy and power are frequently used in everyday language. There are two types of energy, kinetic and potential. This is a complete set of notes of work energy and power which is a part of physics syllabus for neet, jee. Cbse class 11 physics notes chapter 6 work energy and power.
To calculate the work done on an object by a force. Note if power is more, work is done fast and vice versa. 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. Power is the rate at which work is done or energy is transformed. When a net force does work on an object, then there is always a change in the kinetic energy of the object. Voltage current resistance and electric power general.
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