Two coins are on a turntable that steadily speeds up, starting from rest, with a ccw rotation. Which coin flies off the turntable first? Coin 2 is further away than coin 1. MY ATTEMPT: I believe centrifugal acceleration is done by friction. So fs=us*m*g. Fc=mv^2/r. Then, v=sqroot(us*g*r). Suppose coin 2 is at radius 2(r1), (r1) being the distance from center of coin 1. angular velocity 1= r1(sqroot(us*g)) angular velocity 2=2r1(sqroot(us*g)) So, I conclude that coin 1 must be thrown off first. HOWEVER, the answer manual says it is coin 2, which is an obvious answer for me too. But, I can't seem to be able to prove it.