Date : 6/14/2017 7:19:28 AM
From : "MSN.com - Hotmail, Outlook, Skype, Bing, Latest News, Photos & Videos"
Subject : Why don't roller coasters fly off the tracks?
Upstop wheels apply friction under the tracks to prevent roller coasters from derailing during zero-G drops and turns.
הצגת מאמר...
Upstop wheels apply friction under the tracks to prevent roller coasters from derailing during zero-G drops and turns.Upstop wheels apply friction under the tracks to prevent roller coasters from derailing during zero-G drops and turns.