Build and race soap box derby cars as part of a unit on force and motion.

GRADE LEVEL 6–8

BIG IDEA/UNIT Using engineering design to solve problems

ESSENTIAL PRE-EXISTING KNOWLEDGE The motion of an object is determined by the sum of forces acting on it; conservation of energy

TIME REQUIRED Approximately eight class periods

COST Approximately $25 per class (if you already own a 3-D printer)