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Other models are used because working with and testing a model can be safer and less expensive than using the real thing. For example, the crash-test dummies shown in Figure 21 are used in place of people when testing the effects of automobile crashes. To help train astronaunts in the conditions they will encounter in space, NASA has built a special airplane. This airplane flies in an arc that creates the condition of freefall for 20 to 25 seconds. Making several trips in the airplane is easier, safer, and less expensive than making a trip into space.

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