the cup

This weekend was my grandpa's 83 birthday. It was actually on friday but we celebrated it on sunday. I went to my cousin JR's house and we had a small party with the family. We ate lots of food, sang happy birthday and ate the cake and ice cream. When I was eating, I was drinking water in a green cup. Some of my cousins and uncles and aunties were watching this show man vs. food. Some of the stuff he ate was so big and greasy looking. After they showed one of the foods, my family reacted to it and all said "eew". I wanted to see what they were so grossed out about. So, without thinking, I put my cup down on the table and hurried to the tv room. But as I started running, I heard my cup fall on the floor. The reason why it fell can easily be explained by physics. In the first picture, the center of mass is supported by the table. But my cup's center of mass wasn't causing it to fall on the floor. The weight of the cup creates a downward force. When it is supported, then there is no lever arm so it can't exert a torque and fall over. But when the cm isn't supported, the lever arm is from the edge of the table to the cm and there is a torque which causes the cup to rotate over. Next time, I need to pay attention and make sure the cm of my cup is fully supported by the table :)