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Describe a system in which the main forces acting are parallel or antiparallel to the center of mass, and justify your answer.
Question by OpenStax is licensed under CC BY 4.0.
Final Answer

A parachuter or a car driving, could be examples.

Solution Video

OpenStax College Physics Solution, Chapter 7, Problem 15 (Test Prep for AP® Courses) (0:31)

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Video Transcript
This is College Physics Answers with Shaun Dychko. A parachuter falling is an example of a system where you have forces that are parallel and anti-parallel. You have gravity down, you have friction upwards, or you might have a system consisting of a car and you'd have the car accelerating and exerting some force to propel itself and you'd also have some drag force going the other way.