Gecko Adhesion and Molecular Forces

The video explores how geckos defy gravity by using van der Waals forces, a type of intermolecular force, rather than claws or adhesives. It explains the concept of electronegativity and how it leads to molecular attraction. Geckos have specialized toe structures with setae and spatulae that maximize surface contact, allowing them to stick to surfaces. This natural adhesion has inspired the development of man-made materials that mimic gecko's adhesive abilities, although they are not yet as strong.

What principle do geckos use to stick to surfaces?

• Magnetic attraction

• Friction

• Intermolecular forces

• Chemical bonding

What is the term for an atom's tendency to attract electrons?

• Electron affinity

• Atomic radius

• Ionization energy

• Electronegativity

How do molecules with different electronegativities interact?

• They repel each other

• They become neutral

• They create charged patches

• They form ionic bonds

What are van der Waals forces?

• Strong chemical bonds

• Magnetic forces

• Weak interactions between charged particles

• Weak interactions between uncharged molecules

What is the primary function of the setae on gecko toes?

• To engage van der Waals forces

• To protect the gecko's feet

• To secrete adhesive substances

• To provide grip through friction

How many spatulae does a gecko have on its toes?

• About two hundred

• About two million

• About two billion

• About two thousand

What allows a gecko to release its grip from a surface?

• Applying more pressure

• Increasing the angle of its toes

• Decreasing the angle of its toes

• Using its claws

What is one application of gecko-inspired technology?

• Building earthquake-resistant structures

• Creating stronger adhesives for everyday use

• Developing non-stick cookware

• Designing lightweight clothing

How high can a person climb using gecko-inspired materials?

• 10 feet

• 50 feet

• 15 feet

• 25 feet

What is the gecko's prey also using to stick to surfaces?

• Claws

• Adhesive glues

• Magnetic fields

• Van der Waals forces