Thank you for the reply. Do you mean I should use "onto" instead of "on"?On is a preposition of place.
Onto is a preposition of motion.
The shower hose is in motion.
In some cases the distinction is unimportant but, in your sentence, it sounds as if the wall is on the floor -> the on tells us is where (the place that) the wall is.
I was aware of what you were trying to say - you have now used the correct preposition.In that particular sentence, I'm actually talking about a handheld shower mounted on the wall and then the hose along with its faucet is detached from the wall and falls down onto the ground.