Simplified Physics | Chapter 7 - Work, Energy and Power

Welcome to Chapter 7 of Simplified Physics – Work, Energy and Power. Work, energy and power are fundamental concepts that help us understand motion, machines and many everyday phenomena. In this chapter, we explore how forces transfer energy, how energy changes from one form to another, and how quickly work is performed. We begin by understanding work done by a force and its dependence on the force, displacement and the angle between them. We then study the relationship between work and kinetic energy, followed by the concepts of work and potential energy. Next, we examine the conservation of mechanical energy and understand how kinetic and potential energy transform into each other. We explore power and its units, and study the role of non-conservative forces, such as friction and drag, in mechanical systems. The chapter also includes real-life applications and numerical examples to help apply these concepts to practical situations. Throughout the chapter, emphasis is placed on understanding the physical meaning of concepts and equations, supported by clear diagrams and step-by-step problem solving rather than simply memorising formulas. *TOPICS COVERED* 00:00 Introduction 01:35 Topic 1 – Work Done by a Force 04:07 Topic 2 – Work and Kinetic Energy 09:00 Topic 3 – Work and Potential Energy 15:50 Topic 4 – Conservation of Mechanical Energy 21:54 Topic 5 – Power and Its Units 27:01 Topic 6 – Work Against Non-Conservative Forces (Friction and Drag) 33:34 Topic 7 – Real-Life Applications and Numerical Examples 47:12 Topic 8 – Summary and Key Takeaways This lecture is part of the **Simplified Physics – Complete Course**. *Simplified Physics – Concepts Made Simple for Everyday Life.*