When considering group size for the Playground Physics app, I recommend a minimum of three students to a maximum of five students. The number of students ultimately depends on the activity your students are engaged in. If it is a simple ball toss or bounce, then four students is preferable. One student to shoot the video (holding the iPad), another to hold a meter stick (in the video), and the other two students as actors in the video doing the sports activity. Remember, at the end of the activity, the students will need some time to graph and analyze their findings. I recommend completing this in the classroom.
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