Simple Machines Explained: Levers, Pulleys and Mechanical Advantage | Physics Explained 9.3

"Give me a place to stand, and I will move the Earth." This lesson shows how machines multiply force without creating energy: work in equals work out, so a smaller force must act over a longer distance. It covers the ideal mechanical advantage of levers, wheels and axles (a tap handle), ramps, wedges, screws (a car jack with an IMA near 380) and pulleys (count the ropes), the efficiency of real machines (a lever at 91%), and complex machines like wire cutters, whose advantages multiply (about 33). Plus a real screw jack in 3D lifting a car (IMA 377, about 10 N of effort). Chapters: 0:00 Intro 0:50 The catch: force for distance 1:43 The lever 2:53 The wheel and axle 3:31 Ramps, wedges and screws 4:39 A real screw jack 5:34 Pulleys 6:19 Efficiency 7:42 Complex machines 8:34 Common mistakes 9:04 Recap 9:49 Check yourself 11:01 Up next Physics Explained, Chapter 9: Work, Energy, and Simple Machines (lesson 3 of 3) Adapted from Physics by OpenStax (https://openstax.org/details/books/ph..., licensed under CC BY 4.0 (https://creativecommons.org/licenses/.... The animations and narration are original to Prime Mover. OpenStax is not affiliated with this channel and does not endorse it. Prime Mover: learn it, build it, share it.