Is a roller coaster standing still allowing people to get on is this energy being transfer?

Yes, the roller coaster is in a state of equilibrium, meaning the net force acting on the roller coaster is zero. While standing still, the roller coaster is not moving and therefore has no kinetic energy. However, it does have potential energy due to its position relative to the ground. As people get on and off the roller coaster, the distribution of mass changes, causing a slight change in the potential energy of the system. This change in potential energy is transferred through mechanical work as the roller coaster moves up and down the track.