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Author Topic: Speeding applet  (Read 7899 times)
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finnlysell
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on: February 24, 2008, 04:44:39 am »

I would like to have an applet that shows the consequenses of speeding. In Urban area it is only allowed to have a speed of 50 km/h.
Let us assume that a child steps into the street and that a car just manages to stop with a margin of 0,5 meter from the child ( reaction time set to 1,5 sec. and decelleration set to -0,8 m/s2 )
An other car speeding with just 10 km/h - driving 60 km/h - what will the impact speed on the child be.
In Denmark where I teach physics - the local - safe-driving organisation has had a campaign about this with advertising on buses etc. saying 10 km/h = 44 km/h
The math behind this is not very hard - but I would like to show it in an applet anyway -
You could expand problems by saying that it is slippery a=-0,4 m/s2 or you are disturbed by a phonecall - reactiontime set to 2.5 sec
I hope that somebody would like to do the applet.
Best wishes
Finn Lysell
Denmark
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Fu-Kwun Hwang
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Reply #1 on: February 24, 2008, 03:52:25 pm »

Registed user can get files related to this applet for offline access.
Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
If java program did not show up, please download and install latest Java RUN TIME

I hope the following applet is what you want.

There are two cars in this simulation.
Those two cars have the same initial conditions.
When radio button labeled "all" is checked: (default state when "initialize" button is clicked).
 You can adjust initial velocity, reaction time and friction coefficient for both cars with sliders.
If you radio button "2" is checked:
 The sliders only change values for car number 2.

Both cars will move from left to right after you click "play" button.
The simulation assume at a random time (selected by random number), both driver saw something bad happened
and s/he will stars to hit the brake and stop the car (However, the reaction time and stopping are controlled by adjustable slider(reaction time/friction coef.) before you click play button.

The V-t diagram will save the last three sets of v-t traces so different conditions can be compares.
Let me know if you need more features!



Registed user can get files related to this applet for offline access.
Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
If java program did not show up, please download and install latest Java RUN TIME
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