1) Our structure was wide at the bottom but it was not strong or stable enough to hold the whole model together. The model got thinner and since we rolled the newspaper more, it got heavier and fell down at the end.
2) A wide and strong base makes a tall structure stable. Also the less the mass of the structure, the more stable it is since heavy structure lean or fall down quickly.
3) The centre of the gravity is the base of the structure which hold the model together.
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