Everyone has heard of it and most people misuse it: centrifugal force. Physicists cringe every time they hear it. From describing fairground rides to spinning toys around our heads on the end of ropes, this unit will enable students to play with the concept and conclude that the force is definitely inward. If they are going in circles, then the force is centripetal! So what is the centrifugal force? And how do they create gravity in a space station? Now we are getting into real extension!