Situation: I am putting things on a cart while facing the wall that has a door on my right.
Alternative situations: I am facing the cart in front of me, holding on to the handle of the cart with both hands as I pull away from the wall in front of me towards the tables. I am grabbing a book from the top shelf of the cart that is in front of me to read on the bench and table behind me.
Question: What allows the cart in front of me to move easily?