Bottle, String and 3 toothpicks (Defying Gravity) Stem Activity
Channel: Kids Fun Science
Date: 2020-06-19

Bottle, String and toothpick Center of gravity

Made for parents and teachers

Chapters
0:00 Kids Fun Science Intro
0:07 What you need
0:16 set up
1:39 The experiment

US Amazon Diamond Braid Nylon cord (string) Works great holding the toothpicks
https://amzn.to/2YONMyD

UK Amazon Diamond Braid Nylon cord
https://amzn.to/3rnSfoX

US Amazon Toothpicks
https://amzn.to/2YeevFO

UK Amazon toothpicks
https://amzn.to/3kXiHUg

Kids Fun Science Online Store (All money made goes back into the schools )
https://teespring.com/stores/kids-fun-science

United States Amazon
My Filming equipment:
Cell Phone Tripod 54 inch Travel - https://amzn.to/34REzbB 
Blue Yeti USB Microphone - https://amzn.to/3ePJwGu 
Green screen & lights - https://amzn.to/2XT9Yc1 
Apple iMac 21.5in 2.7GHz Core i5 8GB memory - https://amzn.to/34ZMIe7
iPhone 8 - https://amzn.to/3byn4zw
iMovie for editing

UK Amazon 
My Filming equipment:
Cell Phone Tripod 54 inch Remote - https://amzn.to/309GCGk
Blue Yeti USB Microphone - https://amzn.to/3sJQdje
Green screen & lights - https://amzn.to/38aOP1o
Apple iMac 21.5in 2.7GHz Core i5 8GB memory -  https://amzn.to/3kQwITt
iPhone 12 Pro - https://amzn.to/2Oto9Cc
iMovie for editing

The center of gravity of an object refers to the central location that gravity acts on the object. This experiment the center of gravity is straight down from the spot where the string hangs on the toothpick. It’s because the weight of the bottle is on the horizontal toothpick which balances just behind the corner of the table. Meaning the bulk of the weight is on the back half of the supporting toothpick on the table.

Because of the middle toothpick, which stands at an angle towards under the table, the bottle (most of the weight) is underneath the table; making the center of gravity on the table because that is the point of contact. as long as the bottle is underneath the table it will work. 

Since the bottle is under the table I could rock the bottle side to side and it will stay hanging, but if I would of rocked the bottle front and backward the bottle would of fell because the center of gravity will shift over the edge of the table.