NTNUJAVA Virtual Physics LaboratoryEnjoy the fun of physics with simulations! Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/
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 Author Topic: Reaction time and car accident  (Read 198388 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
Fu-Kwun Hwang
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 « Embed this message on: January 29, 2004, 08:53:19 am » posted from:,,Satellite Provider

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If you want to measure your personal reaction time, please check out Reaction time

This applet try to demonstrate how your reaction time related to car accident. May be you prevent the car accident, but those car behind you might have car accident due to your slower response.

There are 10 cars in a row, all moving in the the same direction with the same speed.

You are the driver of the second car.

When the first car brakes, its color will turn from yellow to red,

(left)CLICK the mouse button to stop your car.

The average reaction time for the other drivers is control by the value of the T= field_value + 0.1 *random seconds.

The default is 0.5 s which means the reaction time for all the drivers are between 0.5 and 0.6s

You reaction time will determine if an accident will happen or not.

(and how many cars will be involved in the incident)

move mouse cursor inside simulation region,
click left mouse button when the color of the first car turn red

Usage:
You can enter different speed with selected unit.( m/s, km/hr, mi/hr)

distances d between cars and

the friction coefficient of the tire and the road. (0.8 will be a good value for normal situation)

The graph show the velocity for all the cars.

If the car turn red, you know what happened to it.

Subject: Reaction time & car accident
Date: Sun, 24 Oct 1999 21:00:03 +0100
From: "Ray Holloway" middx@middx.screaming.net
To: hwang@phy.ntnu.edu.tw

Hi
I have only just found your wonderful web-site & have tried the
accident experiment, it really is a good lesson for us drivers.Perhaps it should be included in driving tests.
I had not appreciated the "knock on" effect until I noticed that although I could stop in time those behind me could not.
I found that at 100 mph I had to allow 75 feet between cars for them
all to stop & even then it was not succesful every time. A wet road would of made it much worse.
Thanks for a very interesting site, although I have no formal education
in Physics I find it fascinating, so I am going to try the other experiments now.
Regards, Ray Holloway

ray@middx.screaming.net

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 2 ? « Embed this message Reply #1 on: February 19, 2004, 02:17:48 am »

It appears that t cannot be adjusted, as vehicles 3-10 all react at a half second despite assigning a new t.
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Fu-Kwun Hwang
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 « Embed this message Reply #2 on: February 26, 2004, 08:05:11 am »

I believe you forgot to hit [enter] after you provide new value in the textfield.
The program need to know when you finish enter value.
However, I change the program so that when you hit reset it will read new value.
So it should work now (even you forget hit [enter]).
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rfortescue
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 « Embed this message Reply #3 on: May 16, 2005, 01:13:42 am »

Hi Hwang,

I have tried to download the applet so that I can use it for demonstartions in class using a computer that is not networked. I have not received the applet, however!

I received the Reaction Time Measurement applet OK.

Can you help?
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Fu-Kwun Hwang
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 « Embed this message Reply #4 on: May 16, 2005, 07:37:44 am »

If there is an error when send out the email and file, our server should have displayed error message on your web page.
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prajakta
student
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 « Embed this message Reply #5 on: September 04, 2005, 07:13:27 pm »

this mail is in regards to the driving accident test. i am an electronics engineering student and we are doing a project based on reaction time. in this a person will see a stimulus and depending upon that will have to press a key.it will be simple as well as choice reaction time(SRT AND CRT). i found the driving accident test similar to our project.
i kindly request you to give me some information regarding this.also some applcations of reaction time measurement.

regards.
prajakta
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Fu-Kwun Hwang
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 « Embed this message Reply #6 on: September 05, 2005, 07:20:19 am » posted from:Taipei,T'ai-pei,Taiwan

You can check out the following URL for reaction time measurement
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Fu-Kwun Hwang
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 « Embed this message Reply #7 on: April 19, 2006, 01:15:49 pm » posted from:Taipei,T'ai-pei,Taiwan

Someone send me video which shown car accident happened inside a tunnel in Russia.
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green8003
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 « Embed this message Reply #8 on: April 26, 2006, 04:54:09 pm »

hi
im a new member and i dont know that how i dowload the simulations.
if anyone help me this subject i will be glad
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rhipple
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Relativity, Electromagnetism, Open Source Physics

 10 topic138 « Embed this message Reply #9 on: April 26, 2006, 08:24:42 pm »

You have to click the "get applet files" button near the simulation. Then the files will be mailed to you. I think you have to ask Dr. Hwang directly for the source, however.
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green8003
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 11 topic138 « Embed this message Reply #10 on: April 27, 2006, 11:23:26 pm »

thanks rhipple
but i didnt see the thing that you say me.where is that?
im apologise for this
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rhipple
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Relativity, Electromagnetism, Open Source Physics

 12 topic138 « Embed this message Reply #11 on: April 28, 2006, 12:56:06 am »

Here is an example. Go to
NTNU JAVA -> Physics simulations -> kinematics
and look for "bouncing ball". Go to that simulation.
Scroll down and you will see the GET APPLET FILES button. You'll find it after the explanatory text. It should be emailed but sometimes not immediately.
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green8003
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 13 topic138 « Embed this message Reply #12 on: April 28, 2006, 03:39:23 am »

again tahanks rhipple
i found and did.
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Edu
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 « Embed this message Reply #13 on: June 09, 2006, 08:11:54 pm »

just entered the site and im amazed, specially with the time reaction and car accident applet. it is great and makes me think not only about physics, but about how we drive some times.

i would be very interested in showing the applet to my studients. is it possible to download it? i tried to find it but i couldnt. i have already downloaded the time reaction applet with the trafic light turning on red, but i would like to have the accident one to complete the practical utility of it

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Fu-Kwun Hwang
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 15 topic138 « Embed this message Reply #14 on: June 12, 2006, 08:22:53 am » posted from:Taipei,T'ai-pei,Taiwan

Please check out the first message!
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brokenjay
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 « Embed this message Reply #15 on: January 25, 2010, 11:32:41 am » posted from:Quezon City,Quezon City,Philippines

We just need to know that in the applet, some car accident, which has a 50% chance of happening, could cost the person his entire net worth. Then, everyone cares their car insurance for the better aspect. I think that it could be done to the process of facing extra risk.
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kidashley25
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 « Embed this message Reply #16 on: June 19, 2010, 03:25:21 pm » posted from:Quezon City,Quezon City,Philippines

Hard to get in a fatal accident doing 25 in a 45 with your blinker on. It's better for you to drive home drunk than walk home drunk.
-*-
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josevalle
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 « Embed this message Reply #17 on: January 15, 2020, 09:58:40 pm »

Beautiful info, guys!
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Simpson99
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 « Embed this message Reply #18 on: September 24, 2020, 02:22:16 pm » posted from:HANOI,HA NOI,VIET NAM

Free Bubble Shooter is the best and the most reliable way to entertain yourself and made you free from boredom in every situation of life.
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"Reflect, review and renew constantly." ...Wisdom