Handson model for demonstrating intermolecular repulsion and attraction in physics lessons and lab activities. Key benefits Makes abstract molecular forces visible by turning them into a simple mechanical demonstration. Helps students and instructors observe how elastic force resists compression, illustrating repulsion between molecules. Straightforward components and setup allow rapid demonstration and repeated classroom use. What the product includes and how it works Components: two plastic balls, a spring, and a tightened rubber band. The two plastic balls are connected by the spring and the tightened rubber band. Function: compressing the assembly produces elastic force that resists compression, clearly showing the concept of intermolecular repulsion and how objects resist being compressed. Important attributes Function: Designed specifically to simulate attraction and repulsion between molecules using mechanical analogs. Materials: plastic balls, spring, and rubber band as the working elements. Performance: Demonstrates elastic response and resistance to compression through directly observable motion and force. Compatibility: Suitable for physics classrooms, teaching laboratories, homeschool science activities, and outreach demonstrations. Typical use scenarios Classroom demonstration: Instructor compresses the model in front of students to show how elastic force develops and how molecules repel when an object is compressed. Lab experiment: Students perform repeated trials to observe and describe the relationship between applied force and elastic response. STEM outreach or handson exhibit: Use as an interactive station to explain basic concepts of intermolecular forces to general audiences. How to use Assemble the components as provided so the two balls are connected by the spring and tightened rubber band. Apply a compressive force and observe how the spring and rubber band produce an elastic force that resists compression. Discuss observations to connect the mechanical behavior to the concept of molecular repulsion and why objects are difficult to compress. Educational outcomes Reinforces understanding of elastic force, repulsion between molecules, and realworld implications for material compression. Suitable for demonstration, guided inquiry, and supplementing textbook explanations with a tactile model. This model provides a direct, repeatable way to visualize intermolecular repulsion and attraction using simple mechanical parts.