Build a better pencil
http://www.sciencenetlinks.com/lessons.php?DocID=142
The purpose of this lesson is to engage in planning, making, evaluating, and modifying designs; to develop an understanding of constraints such as safety, time, cost, space and availability of materials. At this level, students should be given many opportunities to design and make things using a variety of materials and simple tools. This investigation uses a pencil as a vehicle for introducing the idea of planning and evaluating designs. The Internet resources included in this investigation should provide ideas for further activities related to this topic.
