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Saturday, June 26, 2010

Ejs Open Source Multi Objects rolling down on an Inclined Plane Java Applet « on: June 18, 2010, » posted from:Singapore,,Singapore

a car rolling down a slope and colliding with bumper with coefficient of restitution e = 0.2
http://weelookang.blogspot.com/2010/06/ejs-open-source-multi-objects-rolling.html
https://dl.dropboxusercontent.com/u/44365627/lookangEJSS/export/ejs_model_Car6web.jar
https://dl.dropbox.com/u/44365627/lookangEJSworkspace/export/ejs_users_sgeducation_lookang_Car6web.jar
author:
Ejs Open Source Rocket Car on an Inclined Plane Java Applet is by Wolfgang Christian, Francisco Esquembre, and Mario Belloni using the Easy Java Simulations (Ejs) modeling tool, now remixed by lookang
a car rolling down a slope and colliding with bumper with coefficient of restitution e = 0.2 

Ejs Open Source Multi Objects (Car,Ball,Shell,Disc) rolling down inclined plane
Ejs Open Source Multi Objects rolling down on an Inclined Plane Java Applet
« on: June 18, 2010,  posted from:Singapore,,Singapore http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1840.0

new repurposed name
Ejs Open Source Multi Objects ( Car , Ball , Shell , Disc ) rolling down on an Inclined Plane Java Applet
i must thanks the man, Fu-Kwun Hwang for his worthy of noble prize forum for informal learning cum community of practice CoP.

Ejs Open Source Rocket Car on an Inclined Plane Java Applet is by Wolfgang Christian, Francisco Esquembre, and Mario Belloni using the Easy Java Simulations (Ejs) modeling tool, now remixed by lookang for learning purposes.
Information about Ejs is available at:
http://www.um.es/fem/Ejs/
and also from the OSP Collection on the ComPADRE Web site:
http://www.compadre.org/osp/items/detail.cfm?ID=8243
Access Rights:
Free access
License:
This material is released under the GNU General Public License Version 1.

My thoughts:
so after i am done remixing it, i will also release it's remixed it's source code back, there by guarantee your freedom to share and change free software--to make sure the software is "free to change" for all its users.



ball and ramp for Secondary 1 Science- Physics Average Speed

Objective: Studying the overall speed in a journey

Materials:
x 1 Metal ball
x 4 Electronic stop watches
x Metre-Rule
x Use the ramp to make the track inclined

1. Set the track inclined as shown in the diagram below. Let the ball roll along the track.

Describe the motion of the ball on the track.

Is motion constant speed?

Measure and record the time taken for the ball to travel from the start point to the 30cm,
60cm, 90cm and 120cm markings. Adjust the inclination if necessary so that you can
measure the time comfortably.


Calculate the average speed of the ball from Start point to 120cm.


Set the track inclined as shown in the diagram below. Let the ball roll along the track.
1. In your team, choose one of your team members to place a finger at the 60cm mark to stop the
rolling ball.
2. After stopping the ball for few seconds, remove the finger and let the ball to continue rolling
along the track.
3. Measure and record below the total time taken for the ball to travel from the start point to
120cm mark.

What is the average speed of the ball when it travels from the start point to 120cm mark?

original activity:
This simulation uses Easy Java Simulations (Ejs) to model the problem of a rocket car on an incline plane. When the car reaches the bottom of the incline it can be set to bounce (elastic collision) with the stop attached to the bottom of the incline. The total mass of the car is 2.0 kg which consists of the car body (1 kg), two front wheels (0.4 kg) and two rear wheels (0.6 kg). The front and rear wheels rotate and are uniform disks. In the simulation you can set the incline angle (in radians), the bounce, the thrust of the car's rocket (in Newtons), and you can drag the car to its initial position.

Questions

1. Calculate the change in potential energy of the car when it reaches the bottom of the incline. Your answer should be given in terms of the mass of the car body mB, the mass of the front and rear wheels, mF and mR, the incline angle θ, and the distance the car moves down the incline, L.
2. Calculate the velocity of the car at the bottom of the incline when subject to an arbitrary thrust, T, from its rocket. Don't forget that the wheels of the car rotate. Your answer should be given in terms of the variables described in Question 1 and the thrust, T. Once you have a general form for the velocity, check your answer against the simulation.
3. Given the velocity you found in Question 2, determine the acceleration of the car subject to an arbitrary thrust, T. Again your answer should be given in terms of the variables described in Question 1. Once you have a general form for the acceleration, check your answer against the simulation. Also find the thrust that yields zero acceleration of the rocket.
4. Calculate the velocity of the car at the bottom of the incline when subject to an arbitrary thrust, T, from its rocket. Your answer should be given in terms of the variables described in Question 1 and the thrust, T and the distance the car moves down the incline, L. Once you have a general form for the velocity, check your answer against the simulation.
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