2. What if we wanted to include a vertical loop in our roller coaster? We would have to review what we know about circular motion. Are you lighter at the top of the loop or the bottom? Draw forces at the top and bottom of the RC loop: 3. Horizontal loop: (a) How much force does a horizontal circular track exert on a 4500 kg rollercoaster car moving at an average speed of 14 m/s, if the radius of the loop is 40 m? (b) What is the centripetal acceleration of the car? monly) mi (c) How many "g's" is this acceleration? A