The Astronomy Center has provided educational resources to introductory astronomy educators since 2003. Over the past 20 years, the rapid pace of discovery has rendered some of our linked resources obsolete. Thus, the Astronomy Center will be decommissioned on March 1, 2022. Our highest quality resources will be retained on


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The Physics Teacher
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V. Kuo and R. Beichner; Publisher: American Association of Physics Teachers, Phys. Teach., 44 (3), 168-172 (2006).
Most teachers of introductory physics will agree that many students have difficulty with vectors, so much so that we frequently spend a week at the beginning of the semester…