APS Excellence in Physics Education Award
November 2019

Education Prize Logo
Science SPORE Prize
November 2011

NSF Logo
The Open Source Physics Project is supported by NSF DUE-0442581.

Falling Cup with Ball Model Documents

This material has 2 associated documents. Select a document title to view a document's information.

Main Document

Falling Cup with Ball 

written by Wolfgang Christian

The Falling Cup with Ball model shows a mass attached to the inside of a cup with a light spring. The cup is held upside down, with the mass hanging out of the cup, then released from rest. What happens when the cup is released?

  1. The mass will extend the spring, like a parachute, due to air pressure pulling on the cup.
  2. The mass will be pulled up into the cup by the spring?
  3. The cup will fall with the mass in its original position?
The Falling Cup with Ball model was created using the Easy Java Simulations (Ejs) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double click the ejs_mech_newton_FallingCupWithBall.jar file to run the program if Java is installed.

Published September 1, 2009
Last Modified June 6, 2014

This file has previous versions.

Source Code Documents

Falling Cup with Ball Model Source Code 

The source code zip archive contains an XML representation of the Falling Ball with Cup model.   Unzip this archive in your EJS workspace to compile and run this model using EJS.

Last Modified September 1, 2009

OSP Projects:
Open Source Physics - EJS Modeling
Physlet Physics
Physlet Quantum Physics
STP Book