Why is it that if you hit an item (like a glass cup) on the bottom, it will break at the top?

Question

This happened to me a few hours ago when I bumped the bottom a glass cup against the cupboard and the top part broke.

In: Physics

Answer 1

Because the impact generates a force that ripples through the glass and breaks it at specific areas that cannot dissipate or channel the energy, such as thin edges, curves and fodls

Answer 2

Probably vibrations through the glass broke the weaker top part instead of the thicker bottom