Question
how would i find the speed of a vehical that put down 42feet of 4 wheel skids prior to impact with another vehical that was stopped.?road serfice is concreat.
Answers
drwls
Look up the coefficient of kinetic friction for tires skidding on concrete. Call it Uk
M V^2/2 = M g Uk X
M's cancel; solve for V.
g = 32.2 ft/s^2
V = sqrt(2*g*Uk*X)
The number of tires does not matter.
The answer will be in ft/s
For Uk,
http://ffden-2.phys.uaf.edu/211_fall2002.web.dir/ben_townsend/staticandkineticfriction.htm
suggests a value of 0.8
M V^2/2 = M g Uk X
M's cancel; solve for V.
g = 32.2 ft/s^2
V = sqrt(2*g*Uk*X)
The number of tires does not matter.
The answer will be in ft/s
For Uk,
http://ffden-2.phys.uaf.edu/211_fall2002.web.dir/ben_townsend/staticandkineticfriction.htm
suggests a value of 0.8