# Can I deduce the coefficient of static friction with Mass, Velocity and Radius?

The Known:
Mass=2000kg
Velocity=50m/s

With the given information the lab worksheet I'm working on is asking me to deduce the coefficient of friction so that I can manipulate the data and answer some questions. The problem I have is that I am not entirely sure that this could be done with just the given information. BTW, this is supposed to be a car on a track.

My attempt at the solution is:

Using Fs= mv^2/r I can get 2000*50^2/1000=5000N

so the question I have is can I use this as the following Fs(max) in this equation to figure out the coefficient of static friction?

Fs(max)=μn where n is the normal force or m*g witch in this case would be 2000*9.8=19,600kgs.

If were to attempt that is would be Fx(max)/n = μ 5000/19600=.26

Last edited:

NascentOxygen
Staff Emeritus
Hi Naoki. Would you like to have another go at posting your question. None of the details have appeared in your message.

could you look again, I just edited it. thanks

NascentOxygen
Staff Emeritus
If were to attempt that is would be Fx(max)/n = μ 5000/19600=.26

That looks right, assuming it can go no faster without slipping.

http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif [Broken]

Last edited by a moderator:
I dont know if that is the max speed without slipping. I know that it is the Force of friction with the known. Would that change the answer?

NascentOxygen
Staff Emeritus