You try to bend a dry spaghetti noodle and it snaps in half. What property does this demonstrate?
AFlexibility — the noodle bent before it broke
BBrittleness — the noodle broke instead of bending
CHardness — the noodle resisted your force
DStrength — the noodle was too strong to bend
The dry spaghetti noodle is brittle. When you applied force, it broke instead of bending. A flexible material would have curved without snapping. Brittleness means a material fractures under stress rather than deforming.
Question 2 True / False
Most flexible materials will return to their original shape after being bent.
TTrue
FFalse
Answer: False
False. Some flexible materials spring back (like a rubber band — this is called elasticity), but others stay bent. A pipe cleaner is flexible — you can bend it easily — but it stays in whatever shape you bend it into. Flexibility means it bends without breaking, not that it bounces back.
Question 3 Short Answer
Why would an engineer choose a flexible material instead of a rigid one for a phone case?
Think about your answer, then reveal below.
Model answer: A flexible phone case can absorb the shock of being dropped by bending slightly, rather than cracking or shattering. The flexibility helps it protect the phone by cushioning the impact.
Flexible materials absorb and distribute force by deforming, which reduces the chance of breaking. A rigid, brittle case might shatter on impact, leaving the phone unprotected. Flexibility is an advantage whenever a material needs to handle sudden forces.