open the slide show
start at slide # 28 ( Mass Vs Weight, Start taking notes up to slide 71)
take pics of your notes and submit ( all the notes you have this week)

Four Sided Structure

Correct Height
Length less than 400 mm and more than 300 mm
Width less than 80 mm
Mass less than 25 grams
correct Loading positions :The center, 30. mm to the left of center and 40. mm to the right of center. The 3 loading locations must lie in the same horizontal loading plane
Loading plane : horizontal loading plane (P) between 80. and 120. mm above the support