# Work Energy And Power Notes Class 9 Pdf

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Want to learn by Video Lectures? Work is done when we swim, work is done we lift water from well, etc.

Register Now. Hey there! We receieved your request. The definition of work done may vary in real life and scientifically. For Example , We may consider studying, talking, singing, reading as work but it is not so in the case of science.

## CBSE Class 9 Science Work Energy And Power Notes Set B

Work and Energy Class 9 Notes aims at increasing your self-confidence and reducing the pressure by offering a simple way to study or revise the chapter. Work and Energy Class 9 Notes would fuel your exam preparation which ultimately lead you to score maximum marks. Work done on an object is defined as the magnitude of the force multiplied by the distance moved by the object in the direction of the applied force. The unit of work is joule. The energy of a body is its capacity of doing work.

Revision is very important for better conceptual understanding and securing good marks, and for Revision, Revision Notes are always considered the best. ICSE Class 10 Physics Chapter 2 Work, Energy and Power Revision Notes are one of the most important pieces of study material that students can receive, as it will aid them to study better and reduce the level of stress that students face during the hectic year. Work is said to be done only when the force is applied to a body makes the body move. The amount of work done by a force is equal to the product of the force and the displacement of the point of application of the force in the direction of the force. If the displacement is in the direction of the force i. The S. The energy used in households, industries, and commercial establishments are usually expressed in kilowatt-hour.

## Work and Energy : Chapter Notes

After you have studied lesson, you must be looking for notes to memorize. Work: When a force acts on an object and the object shows displacement, the force has done work on the object. Energy The capacity of a body to do work is called the energy of the body. Forms of Energy: The various forms of energy are potential energy, kinetic energy, heat energy, chemical energy, electrical energy and light energy. Kinetic Energy: Energy possessed by a body due to its motion.

In physical, the word work has a special meaning. Work in one done when the force acting on body produced motion in it in the direction of force or in the direction of component of force. If is because the force exerted by the body is not producing motion of the wall. The speed at which work can be done is an indication of the power of the body doing work. For example, a boy may carry a suitcase upstairs in 3 minutes while a man may do it in 1 minute. Obviously, the power of the man is more than the power of the boy.

In these notes a brief and simple explanation of all important topics is given which will help students make an easy and quick revision of the chapter during the examinations. Though these notes we bring a brief description of the important topics from the chapter which will help you revise the whole chapter quickly and easily during exam days. At the end of the notes you can try the questions asked from the discussed set of topics. These questions will help you to assess your preparation level and get a hold on the subject. It is expressed as the product of force and displacement in the direction of force. Necessary Conditions for Work to be done. Energy The capacity of a body to do work is called the energy of the body.

2. Work and Energy. Work. • Work is done when a force produces motion in a body. • Work done in moving a body is equal to the product of force exerted on the body Power is defined as the rate of doing work or the rate of transfer of energy.

## Work and Energy Class 9 Notes

Some energy-forms are less useful to us than others for example if we see low-level heat energy. It is better to talk about the extraction or the consumption of energy resources for example oil, coal, or wind than the consumption of energy by itself. A bullet that is moving fast has a measurable amount of energy associated with it this is known as the kinetic energy. The energy is gained by the bullet because work was done on it by a charge of gunpowder which lost some potential chemical energy in this whole process. Hot coffee has a measurable amount of thermal energy which it acquired through the work which is done by a microwave oven which in turn took electrical energy from the electrical grid.

Бросив быстрый взгляд на кабинет Стратмора, он убедился, что шторы по-прежнему задернуты. Сьюзан Флетчер минуту назад прошествовала в туалет, поэтому она ему тоже не помеха. Единственной проблемой оставался Хейл.

Сьюзан еще раз перечитала послание Танкадо. Главная разница между элементами… разница между… нужно найти число… - Подождите! - сказала.  - Слово разница многозначно.

Запущенный во второй раз Следопыт все еще продолжал поиск, но теперь это уже не имело значения. Сьюзан знала, что он принесет ей в зубах: GHALEcrypto. nsa. dov Переведя взгляд на рабочий кабинет Стратмора, она поняла, что больше не может ждать, пусть даже помешает его разговору по телефону. Она встала и направилась к двери.

Он улыбнулся. Значит, все правда. - Из какого именно места в Штатах? - спросил. - Они ищут, господин. - Очень хорошо.

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