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,
CLICK the mouse button to stop your car.

The average reaction of the driver is the value of the T= field +- 0.1 seconds. The default is 0.5 s which means between 0.4 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)

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.

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