Design modify and conduct an investigation through testing, revising and occasionally discording ideas, all of which lead to a better understanding of how things work. Collect and summarize data from an experiment and interpret the results in terms of data. Think about these questions for a moment, and answer them in your Sciencelog. When you've finished this chapter, you'll have the opportunity to revise your answers based on what you've learned. If the demonstration was performed in a vacuum, there would be surprising results.
Conclusions Use camcorder to film students results.
Multicultural Extension Inform students that Dr. W. Harris, an African Americn aeronautical engineer, helps NASA develop technology for aircraft of the future. For example, one airplane he helped design can carry 300 passengers on flights across the ocean at more than twice the speed of sound. Use camecorder to tape results to compare and analyze with graphic data.