In this video, I covered potential energy and the law of conservation of energy and used a simplistic example at the beginning of the video to combine both concepts. Later on there are three worked examples that implement as many of the ideas related to the topics covered in the video as possible. If you want more practice on springs click on this video: https://youtu.be/iMV6b11_qXo Conservative vs. Non-Conservative Forces Video: https://youtu.be/LsyxNBU0RTc Timestamps: 0:00 Formulas for Potential Energy 1:52 Ball on Hill Example 2:54 Picking Ground Level 4:26 Calculating Ball's Gravitation Potential Energy 6:18 Introduction for The Law of Conservation of Energy 7:30 Calculating Ball's Kinetic Energy 8:20 Hooke's Law 9:18 Problem 1: Throwing Rock on Bridge Example 14:06 Problem 2: Bow and Arrow Example (Spring PE) 17:48 Problem 3: Sled with Friction Example 23:40 Outro Openstax: https://openstax.org/books/university-physics-volume-1/pages/1-introduction