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

Naoki
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

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## Answers and Replies

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

Naoki
could you look again, I just edited it. thanks

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]

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Naoki
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?

Staff Emeritus