Abstract: Illumined by 2016’s Nobel prize and Feynman s physical education，we discuss deficient for the moment of college physics，i.e.， searching origin and generalization of result.Several key points are summarized from the Atwood machine， trajectory of throwing body，non-inertial system on the tilted surface，a coed on a stable as examples.Namely，the relation between a few variables through derivation of the restrict equation is found; idealization and dimensionless of the trajectory curve; effective gravity force in the non-inertial system; the motion tendency of a system is judged by using the reversal thinking.

Key words: simple model, particle dynamics, law