Science in Action 7
pages 300 to 302
Science Focus 7
|When taking the time and money to build a structure, we ultimately want them to last as long a possible in a safe manner. How can you ensure that a structure is stable?
For thousands of years humans have been building structures. If we look at those structures that have lasted for centuries what are the common characteristics?
When looking at two dimensional structures what is the strongest structure? Is it a rectangle, a square, or a triangle. Read page 301 in Science in Action and try the simple exercise with a drinking straw to assess these different structures.
By gently pushing on the upper corner of each shape, which structure was the strongest?
From what you have learned about strong structural shapes, build a model of a tower using mini-marshmallows and toothpicks. How many stories high can you build?
Build some floors with triangular cross beams and some without. Which is more stable? Which has more deformation?
For those toothpicks used in the vertical and horizontal directions, cut 1 cm off. Leave those toothpicks which will be used as diagonal cross beams at the full length of the toothpick.