system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If I'm holding a stick that is light years long but has weight of just a gram. If I move my hand slighty, would the end of the stick also move at the same time?
gpt
No. Your hand imparts a pressure on the end of the stick and it must propagate to the end of the stick through the material of the stick. This pressure wave moves at a characteristic speed depending on the material, also called the "speed of sound" within that material. It will be well below light speed in all cases.