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written by Tom Henderson
One of the deadliest misconceptions among beginning physics students is that centrifugal motion (away from the center) is a "force".  Many students confuse the outdated centrifugal "force" definition with centripetal force.  The author gives an in-depth explanation supplemented with two animations to illustrate why the velocity vector is tangential to the circle and how this relates to the direction of the force on an object moving in a circular pathway.
Subjects Levels Resource Types
Classical Mechanics
- Applications of Newton's Laws
- Motion in Two Dimensions
- Rotational Dynamics
- High School
- Middle School
- Instructional Material
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- Physical Science
- Physics First
- Conceptual Physics
- Algebra-based Physics
- AP Physics
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Keywords:
centrifugal, centrifugal force myth, centripetal force, circular motion
Record Cloner:
Metadata instance created January 18, 2007 by Caroline Hall
Record Updated:
January 27, 2014 by Caroline Hall
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when Cataloged:
December 12, 2004

### AAAS Benchmark Alignments (2008 Version)

#### 4. The Physical Setting

4F. Motion
• 9-12: 4F/H8. Any object maintains a constant speed and direction of motion unless an unbalanced outside force acts on it.

This resource is part of 2 Physics Front Topical Units.

Topic: Kinematics: The Physics of Motion
Unit Title: Circular Motion

One of the most deeply entrenched misconceptions among beginning physics students is that centrifugal motion (away from the center) is a "force" in itself.   In this tutorial, part of Physics Classroom, the author explains why the direction of force is viewed from an inertial frame of reference in a classical mechanics course and thus why centrifugal motion is not a force in a Newtonian framework.

Topic: Dynamics: Forces and Motion
Unit Title: Rotational Dynamics

One of the most deeply entrenched misconceptions among beginning physics students is that centrifugal motion (away from the center) is a "force" in itself.   In this resource, part of Physics Classroom, the author explains why the direction of force is viewed from an inertial frame of reference in a classical mechanics course and thus why centrifugal motion is not a force in a Newtonian framework.

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AIP Format
T. Henderson, (1996), WWW Document, (https://www.physicsclassroom.com/Class/circles/U6L1d.cfm).
AJP/PRST-PER
T. Henderson, Physics Classroom: The Forbidden F-Word (1996), <https://www.physicsclassroom.com/Class/circles/U6L1d.cfm>.
APA Format
Henderson, T. (2004, December 12). Physics Classroom: The Forbidden F-Word. Retrieved July 15, 2024, from https://www.physicsclassroom.com/Class/circles/U6L1d.cfm
Chicago Format
Henderson, Tom. Physics Classroom: The Forbidden F-Word. December 12, 2004. https://www.physicsclassroom.com/Class/circles/U6L1d.cfm (accessed 15 July 2024).
MLA Format
Henderson, Tom. Physics Classroom: The Forbidden F-Word. 1996. 12 Dec. 2004. 15 July 2024 <https://www.physicsclassroom.com/Class/circles/U6L1d.cfm>.
BibTeX Export Format
@misc{ Author = "Tom Henderson", Title = {Physics Classroom: The Forbidden F-Word}, Volume = {2024}, Number = {15 July 2024}, Month = {December 12, 2004}, Year = {1996} }
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%A Tom Henderson %T Physics Classroom:  The Forbidden F-Word %D December 12, 2004 %U https://www.physicsclassroom.com/Class/circles/U6L1d.cfm %O text/html

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%0 Electronic Source %A Henderson, Tom %D December 12, 2004 %T Physics Classroom:  The Forbidden F-Word %V 2024 %N 15 July 2024 %8 December 12, 2004 %9 text/html %U https://www.physicsclassroom.com/Class/circles/U6L1d.cfm

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### Physics Classroom: The Forbidden F-Word:

Has Student Extra The Physics Classroom: Inertia and the Right Hand Turn

Need to see it? View the Inertia and the Right Hand Turn animation from the Multimedia Physics Studios.

relation by Tom Henderson
Has Teaching Guide Physlets: Classroom Exercises: Mechanics - Circular Motion

Thinking Physics! Present your students with this short decision-making challenge.

relation by Tom Henderson
Has Student Extra Flickr Physics

Visit The Physics Classroom's Flickr Galleries and enjoy a visual overview of the topic of circular motion

relation by Tom Henderson
Has Student Extra Shockwave Studios

Think you get the idea? Try the Race Track activity from the Shockwave Studios.

relation by Tom Henderson
Has Teaching Guide PBS Teachers

View a lesson plan from PBS Teachers on the topic of centripetal acceleration and force.

relation by Tom Henderson

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