Work energy and power formulas pdf

The watt is the standard metric unit used to express power. This relationship between kinetic energy and work is called the workenergy theorem. Chapter 6 work, kinetic energy and potential energy. That attraction arises from the earths large mass, not the fact that it is spinning.

Imagine you are pushing a heavy box across the room. To calculate the work done on an object by a force. There are several good examples of work which can be observed everyday a person pushing a grocery cart down the aisle of a. Power is the rate at which work is done, or the rate at which energy is transferred. Learn science work power formulas with free interactive flashcards. Power is the rate at which work is done or energy is transformed. 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. Physics notes class 11 chapter 6 work, energy and power. Work is said to be done when a force applied to an object moves that. Ohm unit of resistance one ohm is the resistance offered to the passage of one ampere when impelled by one volt. 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. We can calculate work by multiplying the force by the movement of the object. Work, energy, and power the physics classroom, 2009 page 2 the amount of work w done on an object by a given force can be calculated using. Free pdf download of ncert solutions for class 11 physics chapter 6 work, energy and power solved by expert teachers as per ncert cbse textbook guidelines.

A small object of mass m 234 g slides along a track with elevated ends and a central flat part, as shown in below figure. The formula for power is work divided by time, or p w t. Work and kinetic energy conservative and nonconservative forces work and potential energy conservation of energy calculus method for determining work power. A woman carrying water from a well to her house is said to be working. Therefore, the change in the cars kinetic energy is equal to the work done by the frictional force of the cars brakes. In other words, the work done is equal to the change in k. 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. In a drought affected region she may be required to carry it over large. Workenergy theorem work, energy and power siyavula. A farmer clearing weeds in his field is said to be working hard. Here, youll learn about how its one of the most useful concepts in physics. To find the work done on the car, we just need to figure out how much energy was given to the car. Work done by the force is equal to the product of the force and the displacement of the object in the direction of force. Work, energy and power thursday february 12th reading.

Mar 24, 2019 here are complete work energy and power important notes and summary. Free pdf download of physics class 11 chapter 6 work, energy and power formula prepared by subject expert teacher at vedantu. The kinetic energy of an object is a scalar value, meaning it does not depend on the direction the object moves in. Where w is work being done, kf is the final kinetic energy of the object, ki is the initial kinetic energy of the object. Work energy and power conservation of energy collisions. 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, energy, and power equations flashcards quizlet. Then the work done by the force is the component of f in the direction of motion. December 1996 subcourse overview this subcourse is designed to teach you to perform work, power and energy calculations for electrical circuits. Power is the rate of doing work, so the units are joules per second watts. Work is the product of force and the distance over which it moves. The terms work, energy and power are frequently used in everyday language. Work formula example of work types of energy power formula questions.

In this case, the car was given kinetic energy and it took two seconds to give it that kinetic energy. Power is the amount of energy used to cause a displacement over time. In grade 10, you saw that mechanical energy was conserved in the absence of nonconservative forces. Mathematically, it is computed using the following equation. Choose from 500 different sets of science work power formulas flashcards on quizlet. Work done is measured in joules which has symbol j. The amount of work done is equal to the amount of energy transferred. At maximum compression, the box has a speed of zero. We know that all the cars kinetic energy is lost to friction. The energy of a moving object is called kinetic energy. For an object of mass m, moving with velocity of magnitude v, this energy can be calculated from the formula. The ratio of the kinetic energy gained to the work put in to lifting the cars is the efficiency kegpe of the system.

Physics formulas work power energycheatsheet physics tutorials. Jul 24, 2018 unsubscribe from physics wallah alakh pandey. Suppose a force f acts on a body, causing it to move in a particular direction. 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.

Work, energy and power pdf notes, important questions and synopsis. Cbse class 11 physics notes chapter 6 work energy and power. Feb 09, 2017 work, energy and power formula list and important points. Work, energy and power physics neet class topperlearning. 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. What is work energy and power get notes, books, formulas. Work, power, and energy are among the most important concepts of mechanics. In other words, power is a measure of how quickly work can be done. Solved examples on work, power and energy study material. 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.

This relationship between kinetic energy and work is called the work energy theorem. 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. 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. 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. Energy cant be created or destroyed, it can only be changed from one type into another type.

This is the workenergy theorem or the relation between kinetic energy and work done. 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. Work, energy and power formula list and important points. For example, potential energy in the compressed spring, kinetic energy in the moving object, electromagnetic energy and heat are some of them. 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. Common electrical units used in formulas and equations are. For formulas, see formula for average power, definition of instantaneous power, and formula for. Dimensions of power linear momentum of an isolated system is always conserved in a collision. Work and kinetic energy formula, definition, equation. Work, energy and power definition, units, formula, examples, types.

Work and energy whenever a force makes something move, work is done. The work w done by the net force on a particle equals the change in the particles kinetic energy. Work energy and power conservation of energy collisions notes in. It is measured by the product of the force and the distance moved in the direction of the. The newton is a compound unit, and so a joule is also equal to, the equation w fd depends on the force and the displacement being in the same direction. Work energy and power conservation of energy collisions notes in pdf physical definition work. Work is defined as energy transfer, energy is a scalar quantity and the sign indicates whether energy was increased or decreased. Using the estimates of kinetic energy from problem 3, calculate the efficiency energy in vs. Volt unit of electrical potential or motive force potential is required to send one ampere of current through one ohm of resistance. Work and kinetic energy formula, definition, equation, videos. In other words, the work done on an object is the change in its kinetic energy. Energy transformed work done applied force x distance. Work, energy and power gcserevision, physics, forces. Along the way, well talk about work, kinetic energy, potential energy, and conservation of energy.

Whenever a force makes something move, work is done. 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. Ncert solutions for class 11 physics chapter 6 work. Work done is generally referred in relation to the force applied while energy is used in reference to other factors such as heat.

Solved examples on work, power and energy study material for. Phys 101 most of us love the dear old earth, in fact were quite attracted to it. 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. All chapter 6 work, energy and power exercises questions with solutions to help you to revise complete syllabus and boost your score more in examinations. Concepts of work, kinetic energy and potential energy are discussed. 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. W is the work, f is the force, theta is the angle of the force being applied to the object, and s is the horizontal displacement of the object. Work, power, and energy electrical subcourse number it 0348 edition a us army intelligence center fort huachuca, az 8566000 2 credit hours edition date. Calculate the amount of work done by the rocket on the car during the quartermile run. This section covers work, energy and power using maths.

Work, energy and power tuesday february 10th reading. We talk about going to work, doing homework, working in class. Calculate the amount of work done by the rocket on the car during the quarter mile run. The engine of your motorcycle works under this principle. During this process, the force on the cycle due to the road is 200 n and. Work done w is defined as the dot product of force f and displacement s. Work, energy and power definition, units, formula, examples. Cbse class 11 physics work, energy and power formulas. 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. Energy the capability of doing work is called energy. Power is defined as the rate at which work is done or the rate at which energy is transfered to or from a system. If we are using one kw of power, a kwh of energy will last one hour.