Many times students look at graphics and word problems as perfect storms. If the problem is analyzed and related to a real life situation, I bet concepts should be easily understood. Today I was tutoring a senior student on Physics. She looked at a graph of time vs velocity with a question mark on her face. What I did was to place her on a real life case in which she is driving from home, speeds up, see a well known police officer in this area, so.... slowing down, then driving at constant speed (flat section of graph with acceleration = 0) and then slowing down again when getting to her friend's house before stopping. That was an AHA moment indeed!