Why do clothes crumple when folded?
Show answer & explanation
Answer: Fiber stress creates creases
Gravity pulls on fabric folds — Wrong. Gravity can worsen creases, but crumpling occurs because folding stresses fibers beyond elastic limit, causing plastic deformation.
Material loses original shape — Wrong. Shape changes, but mechanism is fiber stress—bending creates compression (inside fold) and tension (outside), exceeding elastic limit.
Fiber stress creates creases ✓ — Correct! Fabric fibers bend when folded. Outside of bend: fibers stretch (tension). Inside: fibers compress. Elastic limit: maximum stress before permanent deformation. Sharp folds exceed elastic limit—fibers permanently deform (plastic deformation)—crease! Iron provides heat + pressure—relaxes fibers back toward original configuration. Wrinkle-resistant fabrics have elastic fibers or special weaves resisting plastic deformation. Cotton wrinkles easily; polyester resists.
More Physics in Daily Life questions
- In a warm office that already reads 26 C, which change can make people feel cooler without lowering the thermostat?
- Why might 26 C feel acceptable in a breezy naturally ventilated summer building but too warm in a sealed winter office?
- On a warm humid day, why can the same 27 C room feel much worse once you start sweating?
- Why can moving air make a 27 C room feel cooler without changing the thermometer?
- Which hidden factor can make a desk beside a cold window feel chilly even when the thermostat across the room still reads 22 C?
- In the same 22 C room, why might someone who just climbed stairs feel warm while someone sitting in a T-shirt feels chilly?