# Why does the ball detach from the surface of cup?

Here, let’s say I have a tea cup.

In that cup , let us say there is a ball inside the cup which is temporarily fixed to the surface of cup. Now , this ball is fixed very loose but strong enough that if I tilt the cup downwards , it doesn’t fall.

Now , what I noticed is that if I tilt my cup face in downward direction and then I move my cup down with a haste while holding the cups handle. The ball falls down.

I did not apply any pressure or force on the ball from the top of cup or from below the cup. How is it that the ball falls down ?.

What I think is that if I Look at this movement from an inertial frame.

1)I can notice if the cup moves down with 5m/s , then so does the ball moves down with same speed. Also , there is a $$9.8m/s^2$$ acceleration acting all the time. Due to these two factors , it contributes to more acceleration I.e more Force since F=m*a.

1. There should be a force from the air molecules in upward direction . Due to Newton’s third law , the ball pushes the air down. Therefore , also forces itself to fall down.

This is all what I think should happen.

Please let me know if you have any other suggestion or somewhere I went wrong.