A flat sheet of paper cannot hold a textbook, but the same paper rolled into a tube can. Why?
AThe tube is made of stronger paper
BRolling the paper adds more material
CThe tube shape distributes the force across a larger area and resists bending
DThe tube is taller so it balances better
The material is identical — same paper, same weight, same thickness. The only difference is shape. A flat sheet bends easily because force is concentrated along a line. A tube distributes force around its entire circumference, and the circular shape resists collapsing in any direction. Shape is one of the most powerful tools an engineer has.
Question 2 True / False
If a building does not fall down, that means it is well-engineered.
TTrue
FFalse
Answer: False
Not falling down is the minimum — but a building can also sway too much in wind, develop cracks, vibrate uncomfortably, or deform under load in ways that are unsafe. Engineers design structures to meet specific performance standards, not just to avoid total collapse.
Question 3 Short Answer
Name the three main things that determine how strong a structure is.
Think about your answer, then reveal below.
Model answer: Shape, materials, and connections. The shape of the structure determines how forces are distributed. The materials determine how much force each part can handle. The connections determine whether the parts stay together under load.
Engineers control all three factors when designing structures. A bridge might use triangular shapes (strong shape), steel beams (strong material), and riveted joints (strong connections). Changing any one of these factors can dramatically change the structure's strength.