NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/

Easy Java Simulations (2001- ) => Kinematics => Topic started by: Fu-Kwun Hwang on April 11, 2005, 03:51:34 pm

Post by: Fu-Kwun Hwang on April 11, 2005, 03:51:34 pm
The following is a simulation for a real physics demonstration.

A ball is placed in the funnel and the funnel cocked by compressing a spring. The track is raised at one end so that when it is released the cart accelerates down the track. At a certain point a bump below the track trips a lever, releasing the spring and ejecting the ball perpendicular to the track.
Where will the ball fall?

    * (a) The ball will fall in front of the funnel.
    * (b) The ball will fall behind the funnel.
    * (c) The ball will fall IN the funnel.

[b:601ec2c994]You can drag the left slider to change the angle of the track. [/b:601ec2c994]
You can check out http://www.physics.umd.edu/lecdem/services/demos/demosc2/c2-27.htm for a real demonstration or click the above picture to watch the movie.

Post by: jmscott on July 31, 2007, 10:15:00 am
I have 2 questions regarding this applet. First, I notice that the values for yp and k appear at the top of the respective slider bars. However, when I download the .xml file to modify with ejs, the values do not appear. I cannot figure out how to alter the slider properties to display the corresponding values.

Secondly, I am wondering if it is possible to not have the trace be a solid line, but instead leave a point at regular time intervals (the accelerated motion would then be visibly obvious as the distance between adjacent points would change).

Thanks for any help you can give me.

Love the site! :)

Post by: Fu-Kwun Hwang on August 01, 2007, 09:42:11 am
You can modify the model and view for the simulation when you "run applet as signed applet" (You can save the ejs source as .xml, too.)
You need to click the green right triangle to generate new simulation if you have modify the code or if you want to run the simulation.

You can change the property of those two traces to leave points at regular intervals. For examples: skip 5 points, do not connect line between points,...