Dr. Ogechi. Dr. Ogechi is interested in studying the effects of different materials for tires on the velocity of model cars rolling down an inclined plane. Yvonne knows from her economics class that to isolate the effects of a particular phenomenon, all other things must remain the same. In Latin, this is referred to as . In order to keep all other things the same and isolate the effects of one particular variable in the physics experiment, Yvonne will want to do :_________