# Uniform Circular Motion -Explanatory questions

Hydroxide

## Homework Statement

A coin is placed on a turntable. When the motor is stated the turntable starts to rotate. Before it reaches full rotational speed the coin flies off. Explain why and in what direction will it go?

And

A pilot of an aeroplane, when pulling out of a steep dive can sometimes black out. This is attributed to the lack of blood to the brain. Explain this in terms of uniform circular motion.

## The Attempt at a Solution

Well the coin stays on the turntable because of friction between the two surfaces. It flies off in a path that is tangential to the turntable at the point it leaves. But I'm not sure what is the scientific explanation for why it flies off.

And

I'm stumped by the second question

Thanks, any help is much appreciated

as long as $$\frac{mv^2}{r} < Friction$$ or even equal to friction, the coin is going to stay.