Ok, this is a question from a student in my class that was inspired from us watching the ISS Live Earth Feed. He wanted to know if there was a point in space when you would start falling. He likened it to a swimming pool. He said if you were swimming in space was there a point when if you stepped over an imaginary barrier you would suddenly start falling towards Earth.
I was not able to answer him or explain what the transition would be like but thought I could get an answer here so over to you and thanks for anyone who takes the time to respond to an 14/15 year old student.