PHYS114 Lecture Notes - Lecture 2: Kilogram, Galilean Invariance, Inclined Plane

• School: University of Alberta
• Department: Physics
• Course: PHYS114
• Professor: Meldrum

Document Summary

The standard for a kilogram is constantly changing, and is still being worked on until this day. Today, the standard of the kilogram is le grand k". This is a weight made of irpt that is kept in france that acts as the current standard of what a kilogram is. Of course here we have the problem of our standard being based on a physical object, which means that it may be susceptible to change over time. In fact, every year the mass of le grand k changes by a few millionths of a gram. On top of that is the fact that the six. Same conditions, therefore sister copies of le grand k that were made were not subject to the exact their masses are changing at different rates and directions over time. This means that every once in a while the definition of a kilogram must be adjusted so as to correspond to the changing mass of le.