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Jan 23, 2024 · CBSE Class 9 Science Notes Chapter 11 Work, Power and Energy. Facts that Matter. Work: When a force acts on an object and the object shows displacement, the force has done work on the object. Two conditions need to be satisfied for work to be done: (i) A force should act on object.
Aug 22, 2017 · Unit: The SI unit of energy is Joule (J) and its bigger unit is kilo joule (kJ). → The energy required to do 1 Joule of work is called 1 Joule energy. → Sum of kinetic energy & potential energy of a body is called mechanical energy.
The Work And Energy Class 9 Notes PDF covers key concepts like work, kinetic energy, potential energy, power, and the law of conservation of energy. It also includes important formulas and examples to help students understand and solve related problems.
- Work
- Energy
- Potential Energy
- Law of Conservation of Energy
- Power
Work done on an object is defined as the product of the magnitude of the force acting on the body and the displacement in the direction of the force. W = F.s. The SI unit of force is Newton. If a force acting on a body causes no displacement, the work done is 0. For example, pushing a wall. The force component F cos θ gives the component of force a...
Energy is defined as the ability to do work. Its unit is the same as that of work. Energy is a scalar quantity. SI unit of energy or work = Joule (Nm) or Kgm2s−2.
Energy can get stored in an object when work is done on it. For example, stretching a rubber string. The energy that is possessed by a body by virtue of its configuration or change in position is known as Potential Energy.
Law of conservation of energy states that energy can neither be created nor destroyed but can be transferred from one form to another. The total energy before and after the transformation remains constant. Total energy = KE + PE where, 1/2 mv2+ mgh = constant For example: consider a ball falling freely from a height. At height h, it has only PE = m...
The rate of doing work or the rate of transfer of energy is called power. It is denoted by P ⇒ P = SI unit is Watt (Js−1). Average power = Total energy consumed/Total time taken
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Mar 20, 2024 · These NCERT notes for Class 9 Science Chapter 11 on Work and Energy are meticulously designed to cover all of the key concepts outlined in the CBSE syllabus. They provide a thorough understanding of the chapter and are ideal for exam preparation.
- Newton metre (Nm) or Joule (J)
- The object's potential energy is the energy present in it as a result of its location or configuration.
- Energy can exist in the form of mechanical energy (potential energy + kinetic energy), heat energy, sound energy, chemical energy, and light energy.
- Power is defined as the rate of doing work or the rate of transfer of energy.Power = work/time=Fv, where F is the forve and v is the velocity
Chapter Wise Class 9 Science Notes Pdf free download was designed by expert teachers from latest edition of NCERT books to get good marks in board exams. NCERT Class 9 Science Notes contains physics, chemistry and biology notes of all chapters are part of Revision Notes for grade 9 science.
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Download CBSE Class 9 Science Work Energy And Power Notes in PDF format. All Revision notes for Class 9 Science have been designed as per the latest syllabus and updated chapters given in your textbook for Science in Class 9.
