This collision experiment kit is designed for handson study of conservation of momentum and energy conversion using colliding balls of the same size and different masses. The device lets students and experimenters observe and measure momentum transfer in controlled, repeatable trials. Key benefits Demonstrates the law of conservation of momentum with visible, measurable collisions. Handson setup strengthens observation skills, encourages questioning, and links textbook theory to real experiments. Compact metal construction provides stable alignment and consistent results for classroom demonstrations and individual research. Main features Construction: metal components with aluminum alloy rails, sturdy brackets, and clear scale lines for accurate position reading. Included test masses: metal ball, glass ball, plastic ball, and a copper weight. Ball diameter 16 mm. Dimensions: length 250 mm, width 110 mm, overall height 170 mm. Net weight: about 370 g. Simple to set up and operate for repeated collision trials and comparison of outcomes. What you can test Collisions between identicalsize balls with different masses to verify momentum conservation. Effects of adding the copper weight to change mass distribution and observe variation in postcollision velocities. Energy conversion between kinetic and potential forms in impact and rebound scenarios. Typical use scenarios Classroom physics laboratory: Demonstrate principles of momentum and elastic and inelastic collisions during lessons. Student experiments and reports: Allow students to collect quantitative data using the scale lines for velocity and displacement analysis. Science fair or outreach demonstrations: Provide a visual, handson experiment to engage audiences and illustrate fundamental mechanics. Practical details and notes Measurement tolerance: Manual measurement may introduce a 1 to 2 cm error range in the listed dimensions. Color and appearance: Actual item color may vary slightly from photos due to lighting or monitor display differences. Keep components clean and aligned for experimental consistency. This kit provides a practical, portable means to perform momentum and collision experiments using metal construction and multiple ball materials to illustrate key physics concepts.