Versatile demonstration instrument for mechanical energy concepts. This equipment clearly shows conversion between potential and kinetic energy and the conservation of mechanical energy through a swinging roller mechanism. Key benefits Clear concept visualization: Makes abstract energy concepts tangible by demonstrating energy transfer between potential and kinetic forms and illustrating conservation of mechanical energy. Engaging, handson learning: Encourages student interaction and observation, supporting active learning and better concept retention. Low maintenance: After use apply rustproof oil to the swinging roller for long lasting durability and consistent performance. Rustproof oil not included. Practical for instruction: Designed to be used in classroom and laboratory settings to support teacherled demonstrations and experiments. Important attributes Function: Demonstrates conversion of potential energy to kinetic energy and the conservation of mechanical energy. Component: Includes a swinging roller used to illustrate motion and energy transfer. Performance: Provides a straightforward and repeatable way to observe energy transfer and to investigate conversion efficiency. Compatibility: Suitable for secondary and introductory tertiary physics courses, lab demonstrations, and classroom activities. Use scenarios school physics lesson: Teacher demonstrates how raising and releasing the swinging roller converts stored potential energy into kinetic energy and back, reinforcing theoretical lessons. Laboratory experiment: Students record motion to analyze energy transfer and verify conservation of mechanical energy in a controlled setup. Interactive classroom activity: Small groups manipulate release height and measure resulting motion to compare energy conversion under different conditions. This equipment set provides a reliable, easytomaintain means to illustrate the transfer and conservation of mechanical energy, making energy concepts more accessible and demonstrable in educational settings.