Summary: This is Lecture 3 of Chapter Work, Energy and Power. You can find the Lecture 1 and Lecture 2 by clicking on their respective links 1. Kinetic Energy (KE) Kinetic energy is the energy possessed by an object strictly due to its motion. It is a scalar quantity, always positive (or zero), and frame-dependent. … Read more
Summary: This is lecture 2 for the topic Work, Energy and Power. You can find notes of lecture 1 for this topic here. 1. Why $W = \vec{F} \cdot \vec{s}$ Fails The formula $W = \vec{F} \cdot \vec{s}$ only applies when the force is strictly constant in both magnitude and direction over the entire displacement. … Read more
1. The Physics Definition of Work In everyday language, “work” implies physical or mental effort. In physics, work has a highly specific, mathematically rigorous definition: Work is done when a force causes a displacement, and there is a component of the force in the direction of the displacement. If a constant force $F$ acts on … Read more