Observations and results
Did the heavier Hula-Hoop spin slower than the lighter one? Was it harder to spin the heavier Hula-Hoop for a long time than it was to spin the lighter one?
The Hula-Hoop with sand added to it should have clearly felt heavier than the hoop that held no sand. Because of its greater weight, the heavier hoop was pulled down more than the lighter one was as they were spun around in the air. The hula-hooper probably felt a need to work harder to keep the heavier hoop up and spinning, and it might have even been difficult to keep it at waist level for more than 30 seconds. The same force or push to a lighter object when applied to a more massive object will cause the more massive object to change its motion less. The heavier hoop probably spun much slower than the lighter one (such as around 60 to 70 turns per minute for the heavier hoop compared with 100 to 120 turns per minute for the lighter one), although there can be a lot of variability, depending on the hula-hooper and the hoops.
More to explore
The Hooper versus Gravity, from Hooping.org
How Hula-Hoops Work, from Hooping.org
Hula-Hoop Physics, from Meggan Irving and Richard Barrans, University of Wyoming
Motion Mania: Applying Physics to Hula-Hooping, from Science Buddies
This activity brought to you in partnership with Science Buddies