Students will be able to calculate and compare their velocity on smooth surfaces versus rough surfaces in order to infer the effect of different conditions (roughness of surface, slope, surface gravity) on their speed. Background Instructor must review the use of stopwatches prior to the beginning of the activities. Students should also be instructed to walk at a normal pace (no skipping, running, walking fast etc.). Once on the trail distribute the parent/escorts through the group to guide the students (prevent the students from going the wrong way, going off the trail, running or stopping) a