Practice worksheet with 9 practice questions. Includes answer key. These are the same "You Do" questions from the 2.1 Slideshow "Center of Mass of Systems." Use “I Do” practice questions as scaffolded practice, guided notes, or in- class practice. Use “We Do” as group work, pair and share, or in-class practice. Assign “I Do” questions for homework or test review. Aligned for AP Physics 1, Unit 2 Forces and Translational Dynamics:Topic 2.1 Systems and Center of MassCan be used for Physics and