“Work and Energy” is a chapter in the NCERT Science textbook of class 9. In day-to-day life, we consider any useful physical or mental labour as work. But work is defined differently in science. Similarly, we often use the term energy in our daily life, but in science, energy is defined with specific terminology and characteristics. Let’s learn in detail about work and energy as defined in physics in this four-part series. Covered in this part are the concepts of: • Energy • Forms of energy • James Prescott Joule • Kinetic energy • Expressing the kinetic energy of an object in the form of an equation

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