Lec 21: Torque | 8.01 Classical Mechanics, Fall 1999 (Walter Lewin) @ForTheAllureOfPhysics
Lec 21: Torque | 8.01 Classical Mechanics, Fall 1999 (Walter Lewin)  @ForTheAllureOfPhysics
Uploaded December 2014 | Updated September 2026, 2 hours ago
In the absence of a net external torque on an object, angular momentum is conserved. When an object oscillates about an axis of rotation, there is a variable restoring torque acting on the object.

This lecture is part of 8.01 Physics I: Classical Mechanics, as taught in Fall 1999 by Dr. Walter Lewin at MIT.

This video was formerly hosted on the YouTube channel MIT OpenCourseWare.
This version was downloaded from the Internet Archive, at archive.org/details/MIT8.01F99/.

Attribution: MIT OpenCourseWare
License: Creative Commons BY-NC-SA 3.0 US
To view a copy of this license, visit creativecommons.org/licenses/by-nc-sa/3.0/us/.
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This YouTube channel is independently operated. It is neither affiliated with nor endorsed by MIT, MIT OpenCourseWare, the Internet Archive, or Dr. Lewin.
Lec 21: Torque | 8.01 Classical Mechanics, Fall 1999 (Walter Lewin)Lec 17: Motional EMF and Dynamos | 8.02 Electricity and Magnetism, Spring 2002 (Walter Lewin)Lec 26: Traveling Waves and Standing Waves | 8.02 Electricity and Magnetism (Walter Lewin)Lec 06: High-Voltage Breakdown and Lightning | 8.02 Electricity and Magnetism (Walter Lewin)Lec 03: Vectors | 8.01 Classical Mechanics, Fall 1999 (Walter Lewin)Lec 09: Currents, Resistivity and Ohms Law | 8.02 Electricity and Magnetism (Walter Lewin)Lec 20: Huygens Principle, Interference | 8.03 Vibrations and Waves, Fall 2004 (Walter Lewin)Lec 19: Rotating Rigid Bodies, Inertia, and Axis Theorems | 8.01 Classical Mechanics (Walter Lewin)Lec 10: Hookes Law, Simple Harmonic Oscillator | 8.01 Classical Mechanics, Fall 1999 (Walter Lewin)Lec 08: Frictional Forces | 8.01 Classical Mechanics, Fall 1999 (Walter Lewin)Lec 30: Simple Harmonic Oscillations of Suspended Solid Bodies | 8.01 Classical Mechanics (Lewin)Lec 23: Doppler Effect, Binary Stars, Neutron Stars, Black Holes | 8.01 Classical Mechanics (Lewin)
For the Allure of Physics |

Lec 21: Torque | 8.01 Classical Mechanics, Fall 1999 (Walter Lewin)

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