Investigate how surface area and mass affect the time it takes an objects take to fall. Introduces terminal velocity and air resitance. A double-sided worksheet for high ability students. Requires a piece of A4 paper and card, stopwatch and two metre rules plus graph paper. Will take an hour for very able students to complete. Pupils measure the time a piece of A4 paper/card takes to fall 1.5m. Then folded. Worksheet has tables ready to fill in. They will plot a graph of velocity vs surface area (already worked out).