Lesson 1: Analyzing Engineering Designs

Key Idea

Engineers often propose multiple designs to solve a problem, such as maximizing the speed of a magnetic roller coaster launch. To decide which solution is best, they perform an engineering design analysis.

This involves breaking down each design to understand its components—specifically looking at variables like magnet strength and the distance between magnets. By comparing these designs against the criteria (maximum speed), engineers can form initial hypotheses about which setup will store the most potential energy.

Key Idea

Before a design claim can be accepted, the evidence supporting it must be evaluated. Reliable evidence comes from controlled tests where variables are isolated.

If an initial test changed two things at once—for example, increasing the number of magnets while also moving them closer—the data is invalid because it is impossible to know which factor caused the change in speed. Identifying these flaws in testing is the first step toward gathering reliable data through a simulation, where variables can be tested one at a time.