United Scientific Inertia Apparatus – Newton’s First Law Demonstration with Tethered Platform & Marbles

Demonstrate Newton’s First Law—the law of inertia—with the United Scientific Inertia Apparatus, a hands-on physics tool designed for dynamic classroom and lab demonstrations. This simple yet powerful model vividly illustrates how objects either remain at rest or continue in motion unless acted upon by an external force.

The apparatus features a glass marble perched atop a movable platform on a central support rod. When a metal arm is quickly pulled back and released, it displaces the platform while the marble, due to its inertia, stays momentarily suspended. The marble then drops directly onto a specially designed indentation on the support post. A tethered connection between the platform and the base ensures quick reset and protects the marble from unintended contact with the arm, enabling repeatable, safe experiments. Best used on a level surface for optimal results.

This educational kit includes:

Two glass marbles for repeat demonstrations

A tethered platform for safe and easy resetting

A comprehensive activity guide for structured lesson integration

Perfect for teaching foundational physics—especially inertia and reaction forces—this durable kit brings motion principles to life in both high school and early-college STEM settings.