Loop-the-Loop Apparatus

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What’s happening on that roller coaster ride? 
This unit demonstrates the transformation between kinetic and potential energies when a steel ball runs on the 52 in. looped aluminum track. 8 in. dia. loop. 
Track is mounted on a 11-1/2 in. x 4 in. sturdy wood base. 
Attached basket safely catches ball. Includes two chrome plated steel balls.