- #1
mybrohshi5
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Homework Statement
A 50 gram coin is on a horz. turntable. it rides without slipping making 1 revolution every 1.8 seconds. it is 10 cm from the center. the coefficient of static are 1 and the coefficient of kinetic is 0.5.
the size of the force of friction on the coin is
Homework Equations
F = ma
mu_s = F/N
The Attempt at a Solution
I don't think i have to use either static or kinetic coefficients for this problem but i may be wrong.
anyways i did
F = ma
F = m(v2/R)
v = 1rev/1.8s (2pi rad / 1rev)
v = 3.49 rad/s
F = .05kg(3.49^2)/(.1m)
F = 6.09 N
The answer is 60.9 mN so it just seems like i am off a few decimal places but i can't seem to find out where i went wrong or if this is even the right way to approach the problem.
Thanks for any help :)