and/or magnets of different sizes and shapes, several magnetic objects (paper clips, nails, iron filings, etc.), several nonmagnetic objects (plastic, paper, coins, etc.), pens and/or pencils, data-capture sheet - one per student (pages 13, 15, 23, 72, 82 92), 20 small nails, large nails, 20 metal paper clips, several compasses, a table or flat surface, wooden rulers and construction paper.