You will need enough Vernier calipers for 1 between 2 and a supply of Plasticine (about a 4 cm diameter ball for each pair). This practical is mainly to do with processing data so students will need access to computers during the class time.This practical is taken from my text book (p 18) but here the worksheet is extended to give more details about how to use Excel and LoggerPro. It"s not easy to get across the idea...