Why Do Ribbons Curl?

The video explains the physics behind ribbon curling, focusing on the concept of yield, where stress permanently deforms a material. A UK study analyzed this phenomenon, using PVC ribbons and a blade to demonstrate how the outside of a ribbon stretches and curls. The video highlights three main factors affecting curl shape: blade sharpness, speed of pulling, and weight applied. It concludes with tips for achieving the perfect curl and encourages viewer interaction through Patreon and YouTube.

What is the physical property that determines when a material is permanently deformed?

• Density

• Elasticity

• Viscosity

• Yield

In the ribbon curling experiment, what role does the weight play?

• It measures the ribbon's length.

• It sharpens the blade.

• It provides resistance.

• It changes the ribbon's color.

Which part of the ribbon is primarily stretched and deformed during the curling process?

• The outside

• The entire ribbon

• The edges

• The inside

What effect does using a sharper blade have on ribbon curls?

• It makes the curls looser.

• It forms tighter curls.

• It changes the ribbon's color.

• It prevents curling.

What happens if too much weight is applied to the ribbon during curling?

• The ribbon becomes more colorful.

• The ribbon curls more tightly.

• The ribbon breaks.

• The ribbon becomes longer.