Full and Empty Ball Rolling
Name: Courtney S.
Why does a whiffle ball filled with sand roll faster
down a sloped driveway than an empty whiffle ball?
Because, for any given speed, the sand-filled ball has a larger momentum. This
means that forces exerted by small impediments to rolling (e.g., drag, the effects
of breezes, imperfections in the driveway surface) produce momentum
changes that are a smaller fraction of the sand-filled ball's total momentum.
Click here to return to the Physics Archives
Update: June 2012