6. a. A car travels through a valley at constant speed, though not at constant velocity. Explain how this is possible. There is direction change but no magnitude change . * b. Construct a qualitative motion map for the car. c. Is the car accelerating? What direction is the car's acceleration? (Explain how you know.) yes, the car's AccelerAtion is toward the center, This is due to the centripetal force. d. Construct a qualitative force diagram for the car at the moment it is at the bottom of the valley. Are the forces balanced? Justify the relative sizes of the forces. FN - Forces aren't balanced - Fg stays the same while IN enlarges e. If the car's speed is 25 m/s, its mass is 1200 kg and the radius of valley (r) is 25 meters, determine the magnitude of the centripetal force acting on the car. F = my ? Fe = 30,000 1260 ( 25 ) = FC f. Construct a quantitative force diagram for the car at the bottom of the valley. 18 240 AFN Fg 11760