Final answer:
The phrase 'Sharp curve ahead - slow to advisory speed shown' relates to motion physics, where a vehicle must slow down according to the advised limit to navigate a curve safely.
Step-by-step explanation:
The question 'Sharp curve ahead - slow to advisory speed shown' seems to pertain to the concept of motion in physics, particularly when dealing with the path and behavior of a vehicle (or any object in motion) when it encounters curves or different kinds of trajectories.
For instance, when a vehicle approaches a sharp curve, it must adjust its speed according to the curvature to maintain control and safety. The provided references such as 'a curve that is concave downward/upward' and discussions of race car drivers taking different paths around a race track curve highlight understanding motion, speed, and acceleration.
The trajectories mentioned (e.g., rightward-curving parabola or leftward-curving section of a circle) relate to how forces act on objects in motion and can be analyzed using principles of physics. An advisory speed limit is typically provided on road signs to warn drivers of the maximum safe speed to navigate such a sharp curve.