Torque Explained: Why Door Handles Are Far From the Hinges | Physics Explained 6.3

Why is a door so much easier to open when you push at the handle? This lesson covers angular acceleration and tangential acceleration, the rotational twins of the kinematic equations (with a fishing-reel example), torque τ = rF sin θ and the lever arm (then live on a real bicycle crank in 3D: the dead spot, and the chain passing the pull to a smaller cog), pushing a merry-go-round, and balanced torques on a seesaw. It ends with a summary of the whole chapter. Chapters: 0:00 Intro 0:50 Angular acceleration 1:50 Linear and rotational: a perfect match 2:27 Worked example: a fishing reel 3:46 Torque: the turning power of a force 4:49 Torque on a bicycle crank 5:46 Worked example: pushing a merry-go-round 6:24 Balanced torques 7:18 Common mistakes 7:52 Recap 8:39 Check yourself 9:52 Up next Physics Explained, Chapter 6: Circular and Rotational Motion (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.