Compare clocks devised by each group. Set up a conversion table for converting their length units to standard units. Compare device for measuring length with those developed by other students. Groups compare devices. Develop a conversion table to convert their units of mass to the standard unit.
Groups compare mass measuring devices.
Develop a way of measuring force in any system of units the students might derive. Groups compare devices. Demonstrate the concepts of speed and velocity and represent them graphically. Quantify these concepts using the measuring devices they have developed. Relate the speed and velocities they experience to the standard system of units.