Project-Based Learning

This research showed that to better design project-based environments, the importance of selecting driving questions that can help students meet important learning goals and the importance of helping students see the value of the driving question, the challenges of using technology and explored various techniques to integrate technology throughout the curriculum and  the importance of supporting teachers in complex instruction by providing them with explicit strategies. Also this research has taught about how to help teachers do project based science by developing highly developed and highly specified mate materials. The materials focus instruction on a driving question that students find meaningful and important, and around which students can develop an understanding of central learning goals. Using these materials, teachers can engage students in scientific investigations, make use of cognitive tools, promote collaboration, and teach them the deeper conceptual understanding that traditional methods of instruction cannot.

Question:  

How can we ask driving questions relating to simple machines?