A sign (including its post and base) weighs 40 pounds and is supported by an 18 in by 18 in square base. If the wind applies a force of 13.2 lbs to the sign at the geometric center of the sign surface, will the sign tip over? If so, how much evenly distributed weight (sand bags) should be added to the base of the sign to keep it from tipping when the wind blows?

answer:

design model: consists of design geometry; can be 2d or 3d; typically has a black background.

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elements: an element is a single part of a larger group.