A handson demonstration kit for middle school physics that shows how an object moves on a vertical circular orbit. Designed for classroom demonstrations and student experiments, the kit makes key motion concepts visible and repeatable. Key benefits Visualizes motion on a vertical circular track so students can observe real examples of speed, trajectory change, and the conditions needed to pass the point. Simple setup and repeatable operation allow multiple trials and comparisons to reinforce experimental learning. Durable components and straightforward procedure support regular classroom use and guided student investigations. What is included Base frame Circular track Steel balls Plastic magazines for loading balls Ball bags for collection and storage Additional accessories for mounting and handling How it works 1. Place the circular track on a flat desk and level the base frame. 2. Load a steel ball on an inclined rail at the starting height and release it. 3. The ball rolls down, enters the vertical circular track, and can pass the point if the starting height is sufficient. 4. After passing the it continues to the next inclined rail and is collected in the bag. 5. Repeat the trial, lowering the starting height gradually. At a certain reduced height the ball will no longer pass the but will deviate from the track near the point, follow a curved trajectory, and land on the lower track. This behavior illustrates the threshold condition for completing the circular orbit. Important attributes Function: Demonstrates motion on a vertical circular orbit and the transition between constrained circular motion and projectile motion. Compatibility: Intended for middle school physics classes and classroom demonstrations; suitable for desk setups. Materials: Includes steel balls, plastic magazines, ball bags, circular track, and a stable base frame. Size and placement: Designed to be placed on a standard desk or lab table for easy classroom use. Performance: Allows smooth rolling and repeatable trials to observe the effect of starting height on the ability to complete the vertical loop. Practical use scenarios Classroom demonstration: Teacherled experiment to show the relationship between initial height, speed, and the ability to pass the loop . Student lab activity: Small groups run repeated trials, record observations, and compare results to theoretical expectations. Physics club or afterschool workshop: Handson exploration of centripetal motion, energy conversion, and projectile trajectories. This kit provides a clear, repeatable way to demonstrate important physics concepts with easy setup and durable components suitable for regular educational use.