This web page is an interactive physics simulation relating to circular motion. The system is a ball on a string, rotating in a horizontal circle perpendicular to gravity. The user can change the mass, or the tension in the string. The ball's velocity and angle relative to the string are calculated and displayed. This item is part of a larger collection of introductory physics simulations developed by the same author.
This is part of a collection of similar simulation-based student activities.
<a href="https://www.compadre.org/introphys/items/detail.cfm?ID=6851">Duffy, Andrew. Boston University Physics Applets: Circular Motion-A Ball on a String. April 20, 2001.</a>
Duffy, A. (2001, April 20). Boston University Physics Applets: Circular Motion-A Ball on a String. Retrieved February 14, 2026, from https://physics.bu.edu/~duffy/java/Circular.html
Duffy, Andrew. Boston University Physics Applets: Circular Motion-A Ball on a String. April 20, 2001. https://physics.bu.edu/~duffy/java/Circular.html (accessed 14 February 2026).
Duffy, Andrew. Boston University Physics Applets: Circular Motion-A Ball on a String. 2000. 20 Apr. 2001. 14 Feb. 2026 <https://physics.bu.edu/~duffy/java/Circular.html>.
@misc{
Author = "Andrew Duffy",
Title = {Boston University Physics Applets: Circular Motion-A Ball on a String},
Volume = {2026},
Number = {14 February 2026},
Month = {April 20, 2001},
Year = {2000}
}
%A Andrew Duffy %T Boston University Physics Applets: Circular Motion-A Ball on a String %D April 20, 2001 %U https://physics.bu.edu/~duffy/java/Circular.html %O application/java
%0 Electronic Source %A Duffy, Andrew %D April 20, 2001 %T Boston University Physics Applets: Circular Motion-A Ball on a String %V 2026 %N 14 February 2026 %8 April 20, 2001 %9 application/java %U https://physics.bu.edu/~duffy/java/Circular.html
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