Friction – Odd one out

The video tutorial discusses identifying the odd one out among glass, marble, varnished wood, and sandpaper. It explains that sandpaper is the odd one out because it does not have a smooth surface like the others.

What is the odd one out among Glass, Marble, and Sandpaper?

Why is Sandpaper considered the odd one out?

What common characteristic do Glass and Marble share?

How does Sandpaper differ from Glass and Marble?

List the materials that have smooth surfaces.