I was conducting a motion study where a vehicle with four wheels on the ground is going full speed but then comes to an immediate halt. It is front wheel drive and I have put in the appropriate values for deceleration on the front wheels.
I'm interested to see how far the vehicle will skid so I put in the appropriate values for friction on each of the four contacts.
However, the calculation stops instantly with friction on all four wheels. But, if I remove friction, the calculation does work and vehicle does skid.
My question is: why can't I have friction on the rear wheels? I would like to have it because the stopping distance should be more acurate. I believe I have everything mated and contacted correctly. Am I somehow over confining it?