Spring Break Science: A Hands-on Project Survival Guide
second choice* Hoopomania Action Hoop, Hula Hoop with 24 magnets, 1.
Motion Mania: Applying Physics to Hula-Hooping
Motion Mania: Applying Physics to Hula-Hooping
Solving the Hula-hoop Problem: Can it be Done?
Hoopomania Might Hoop, Foam Hula Hoop 2kg
Motion Mania: Applying Physics to Hula-Hooping
Improbable Research Collection #130: The Dynamics of Hula-Hooping
Elementary School, Physics Science Projects (Page 4)
The physics of hula-hooping
Hoopomania Might Hoop, Foam Hula Hoop 2kg
The Physics of a Hopping Hoop
The Physics of a Hopping Hoop