Work, Energy & Power | Work Done Concepts & Force-Displacement Graphs | AS Physics 9702 | Lecture 1 скачать в хорошем качестве

Work, Energy & Power | Work Done Concepts & Force-Displacement Graphs | AS Physics 9702 | Lecture 1

#ALevelsPhysics #Physics9702#PhysicsLecture #PhysicsUnits #PhysicsMadeEasy #SirMAC #physics2025 In order to get the full course, please visit https://sirmahadamer.com/courses Whatsapp : https://wa.me/message/CKEDMPETUF4KA1 Instagram:   / mahad__amer   In this lecture, Sir Mahad Amer begins the important chapter Work, Energy, and Power for AS Level Physics (CIE 9702) with a clear, exam-focused explanation of work done and its applications in physics problems. The lecture starts with the fundamental definition of work done as the product of force and displacement in the direction of the force, followed by practical examples showing how to calculate work when force acts parallel and at an angle to displacement. Students learn how to correctly use the formula: 𝑊 = 𝐹𝑑cos𝜃 Real-life situations involving driving force and friction are explained step-by-step, demonstrating how total input energy is distributed between useful work and energy lost against resistive forces. The session also clarifies the difference between work done by gravity (using vertical displacement) and work done against friction (using actual path length). A key conceptual highlight includes understanding why centripetal force does zero work in circular motion, since the force is always perpendicular to displacement. The lecture further introduces the graphical interpretation of work, showing how the area under a force–displacement graph represents the work done. These foundational concepts prepare students for advanced topics in energy transformations, power calculations, and exam-level problem solving. 📌 Topics Covered • Definition of work done • Work done when force acts at an angle • Driving force and frictional work • Work done by gravity and gravitational potential energy • Work done in circular motion (zero work by centripetal force) • Area under force–displacement graphs • Relationship between work and energy 🎯 Exam Focus • Using 𝑊 = 𝐹𝑑 cos𝜃 correctly • Identifying displacement component in work problems • Distinguishing work done by gravity vs friction • Conceptual questions on circular motion work • Interpreting force–displacement graphs 🔔 Subscribe for complete AS Physics 9702 lectures, past-paper practice, and exam-oriented explanations by Sir Mahad Amer.