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Customers most agreed on the following attributes:
from Grandville, Michigan on 10/16/2008
This product can be used to demonstrate efficiency, begin a disucussion on coefficient of restitution or impulse equals change in momentum. Pull these little guys out when you want to get your students' attention!
from Elkton, MD on 6/8/2008
I purchased a class set of these balls and give them to the students with a piece of wood when I introduce momentum and impulse. I tell them they are sitting on their bed when the house catches fire and they need to design and complete an experiment to determine which ball will be more effective at closing their bedroom door to allow them time to escape out their window.
from Western NC on 5/22/2008
I was glad to finally find these happy/ sad balls for a good price. I used them in church to explain why we can't judge people by the way they look. The kids and adults were enthused by them.
from salt lake city, ut on 2/22/2008
we use these in our sales training.
from Houston, TX on 2/1/2008
It's a really fun product just to have and watch. Great for magic tricks and the like.
from MS on 11/16/2007
Demo of elastic and inelastic collusions.
from Milwaukee, WI on 9/17/2007
Great demonstration of material characteristics
from Arlington, VA on 11/27/2006
Try chilling the balls in icewater for a while. The unhappy ball will bounce, the happy ball won't. Dramatic. (The response of the materials to temperatures is not linear.)
It is interesting to ask the students where the "lost" energy goes when the ball does not bounce. Does the earth move?
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An excellent learning tool.
from Chicago, IL on 11/27/2006
Met expectations.
[6 of 7 customers found this review helpful]
from Arlington, VA on 9/18/2006
For such a simple item, I have been continually surprised how much people like these. I usually bounce the superball for them, palm it and give them the dud, asking them to do the same. When it stops dead on the floor -- without a single bounce -- the look on their face is utter confusion. Provides a useful point for discussion of elasticity, polymers etc. What are these materials useful for? If the sad ball didn't bounce, where did the energy go? And so on. BTW, this is a very good price.