The following books and websites contain additional information, activities, and enrichment options.

Experiments with Motion

Salvatore Tocci, Children's Press, 2003

Forces Around Us

Sally Hewitt, Children's Press, 1998

Levers: Machines in Action

Angela Royston, Heinemann, 2001

Amusement Park Physics: Roller Coaster

http://www.learner.org/exhibits/parkphysics/coaster.html

For additional websites, see the Best of the Net feature at www.eduplace.com/science and sites recommended by the National Science Teachers Association at www2.nsta.org/sciencesites/