[Motion Synthesis Decomposition Demonstration Instrument]: Demonstrate that an object participates in the synthesis of two different aspects at the same time, and draw a motion trajectory [Principle]: The movement of an object in any direction can be regarded as the superposition of several independent movements. Therefore, some common curvilinear (straight line) motions can be measured by parallelograms, and their combined motions can be obtained, which is called motion composition [Ideas]: We have provided some simple experimental ideas. In our pictures, we can use this to open up our ideas to understand some hypotheses about Kinetic Potential Energy [Practical Science]: Appropriate physical activities and research are not only fun, but can also enhance students' observation skills, stimulate questions, and connect the content of the book with real life