In what brand of shampoo does a marble move the slowest?
It would be in the shampoo that has the greatest density.
Since this is not my area of expertise, I searched Google under the key words "shampoo density brand" to get this possible source:
http://shopping.yahoo.com/s:Shampoo:4575-Shampoo%20Type=Extra%20Body%20Shampoos
I hope this helps. Thanks for asking.
the movement of one object around another is