Both periods
Watch 3 videos (calm down, its only 15 min total) about Inclined Planes, Wedges, and Screws:
http://www.youtube.com/watch?v=c0YSaGx6ECs&feature=share&list=PL10FA45A49305A6A5
This is part of a playlist of all the videos for this unit, but it should begin at the video you need.
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