A car moves around a curved track as shown in the diagram. It starts at rest at point A and increases its speed uniformly in a clockwise direction until it reaches a location just before point E. From a point just before E until it returns to point A, it travels with a constant speed. At each point on the diagram draw a vector that represents the magnitude and direction of the net force acting on the car. If the net force at any point is zero, state that explicitly.