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The title says it all: this blog features physics videos found everywhere on the web: animations, demonstrations, lectures, documentaries.
Please go here if you want to suggest other nice physics videos, and here if I mistakingly infringed your copyrights. If you understand French, you'll find a huge selection of physics videos in French in my other blog Vidéos de Physique.

Saturday, 12 March 2011

Centrifugal or centripetal?

A passenger in a frictionless (!) turning cart slides outward. If an observer is looking from the moving cart, he thinks that a centrigual force pushes the passenger outward. But according to an observer at rest, the passenger moves in a straigth line at constant speed (while the cart is turning beneath him). An inward force of friction accelerates the cart toward center of the circle (centripetal acceleration); without this centripetal force, the passenger can't turn and continue in straight line because of its inertia.

Other animations by Yves Pelletier

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