Physics Made Simple | Velocity–Time Graph Explained Here’s the mistake many students make in Physics exams. They assume motion always means acceleration. On a velocity–time graph, when the line is flat, the object is moving at steady speed. Since the velocity is not changing, acceleration is zero. This simple understanding can save you marks. Share this with a student who struggles with graphs. #PhysicsHelp #VelocityTimeGraph #AccelerationZero #StudentTips #PhysicsClass #InstructorAlison | Aliso