Two identical masses on a horizontal turntable are located at different distances from the center of the turntable. As the turntable's rotation rate increases, which mass starts to slide off the turntable first?

1. The mass closest to the center.
2. The mass furthest from the center.
3. Both start to slide at the same time.

With the turntable spinning slowly, and both masses rotating with the turntable, what does the free-body diagram of each mass look like?