Inflection Point: A point on the graph where the concavity changes. It can be thought of as a point where your bike changes direction while climbing up or descending from the hill.
Second Derivative Test: A method used to determine whether a critical point corresponds to a local maximum or minimum by analyzing concavity.
Rate of Change: The speed at which one quantity changes with respect to another. In terms of concave up graphs, it represents how quickly the graph is increasing.