Spinning top toy, which provides an example of the clutch mechanism in

Encourage hands-on exploration and discovery with electronic gears that go round 'n round, flashing lights and happy songs. The interchangeable gears can also be stacked, sorted and re-arranged. An automatic shut-off helps conserve battery life, and a convenient carry handle makes it easy to take with you on-the-go.

Playskool Explore 'n Grow Busy Gears

US20130072084A1 - Spinning toy with trigger actuated stop

Hysteresis diagram obtained in this study

Average results of first type of parameters for the ground motion with

Basic Gear Mechanisms : 21 Steps (with Pictures) - Instructables

What Makes a Toy Top Spin?

Museum of Yo-Yo History

EASYBERG 30 Series Torque Converter 5/8 Clutch 6

Nicholas WIERSCHEM, Assistant Professor, PhD Civil Engineering, University of Tennessee, TN, UTK, Department of Civil and Environmental Engineering