based on models and ideas by

- lookang http://weelookang.blogspot.sg/2013/12/ejss-free-fall-model.html
- Fu-Kwun and lookang http://weelookang.blogspot.sg/2010/09/ejs-open-source-bouncing-ball-with-drag.html and http://weelookang.blogspot.sg/2010/06/ejs-open-source-kinematics-java-applet.html
- Andreu Glasmann, Wolfgang Christian, and Mario Belloni http://www.compadre.org/osp/items/detail.cfm?ID=13050
- template objects from lookang http://weelookang.blogspot.sg/2013/12/ejss-kinematics-model.html

https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_freefall01/freefall01_Simulation.htmlsource: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_freefall01.zip EJSS Kinematics in Y direction Model by lookang, based on models and ideas from Fu-Kwun, Andreu Glasmann, Wolfgang Christian, and Mario Belloni authors: lookang, Fu-Kwun, Andreu Glasmann, Wolfgang Christian, and Mario Belloni author of EJS 5: Paco. |

## The equation that model the motion of the ball is:

https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_model_freefall01/freefall01_Simulation.htmlsource: https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/export/ejss_src_freefall01.zip EJSS Kinematics in Y direction Model by lookang, based on models and ideas from Fu-Kwun, Andreu Glasmann, Wolfgang Christian, and Mario Belloni authors: lookang, Fu-Kwun, Andreu Glasmann, Wolfgang Christian, and Mario Belloni author of EJS 5: Paco. |

taken
from http://psychology.wikia.com/wiki/File:Soccer_ball.svg http://commons.wikimedia.org/wiki/File:Soccer_ball.svg |

This EjsS Free Fall was developed using the Easy Java/JavaScript Simulations (EjsS) version 5. Although EjsS is a Java program, it can create stand alone JavaScript programs that run in almost any PC or tablet.

## Difference between Speed and Velocity:

students are generally confused by the difference between speed and velocity, and it is made harder when teachers use speed and velocity interchangeably.To make learning easier, the following conditions or definitions are programmed into the model:

when

## Calculation to determine acceleration:

the calculation is based on the definition and it
illustrates the usefulness of definition is real life:

## Criteria for uniform motion:

though not include into the model yet, uniform motion is
defined as:

## changes made:

- recreate everything
- made world view
- made the 3 sliders
- made drop-down menu for ease of productive learning ["user_defined","uniform_motion","simple_acceleration","simple_deceleration","toss_up","free_fall","free_fall_and_rebounce"], thanks to paco and wolfgang for event handler !
- checkboxes for
y vs t,vy vs t anday vs t graphs - added markers to appears each second which didn't appear correctly in EJS_5.0_beta_140216
- added logic for speed and velocity

enjoy!