Some metals look extra shiny when you rub them because tiny bits of light bounce off their smooth, polished surface. Imagine a mirror, the smoother it is, the clearer your reflection. When you rub the metal, it gets even smoother, and more light bounces back, making it sparkle like a disco ball.
Examples
- Rubbing a clean copper spoon on a table makes it shine more than before.
- A silver ring starts to look like a mirror after you polish it with a cloth.
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Categories: Physics · metals,friction,light reflection,surface properties