Lesson 10 (Conservation of Energy) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you! Exercises in this video: 1. You compress a spring by 0.2 cm. You measure a restorative force of 0.55N. What is the spring constant of that spring? 2. A scary amusement park shoots you and your friend 80 meters into the air. The total mass of the people and car in the ride is 400 kg. What work was done by gravity on the trip up? How much potential energy is now stored in the gravitational field? 3. All of that energy (in the previous problem) came from around 700 springs, in parallel, each compressed by 1.25 meters. What is the spring constant of each of those springs? 4. Can you use conservation of energy arguments to show that Dianna is wrong, and the back of the roller coaster is by far the best place to sit? Special thanks to Sophia Chen for her awesome shoutout at the end of the video! Credits: Dianna Cowern - Executive Producer/Host/Writer Jeff Brock - Lead Writer/Course Designer Laura Chernikoff - Producer Rachel Watson - Video Editor Sophia Chen - Researcher/Writer Erika K. Carlson - Researcher/Writer Hope Butner - Production Assistant Levi Butner - Videographer Lauren Ivy - Set Design Vanessa Hill - Consulting Producer Aleeza McCant - Illustrator Rachel Allen - Illustrator Consultant - Kyle Kitzmiller Lucy Brock, Samantha Ward - Curriculum Consultants Cathy Cowern - Transcription