Centripetal Force

"I like work: it fascinates me.  I can sit and look at it for hours.  I love to keep it by me: the idea of getting rid of it nearly breaks my heart”
Jerome K. Jerome – Three Men in a Boat (1889)

With a directed towards the center of the circle and v tangential (perpendicular to a)

directed towards the center of the circle

e.g.   Gravitational force keeps the Earth in orbit around the Sun.

The tension in a string keeps a rotating object from flying off

wobbly divider

blue ball  Example Problem

“ It’s true that hard work never killed anybody, but I figure why take the chance ?”

Ronald Reagan – Interview The Guardian (1987)


Dr. C. L. Davis
Physics Department
University of Louisville
email: c.l.davis@louisville.edu