A hanging spring is stretched out by hanging different masses from it. Make measurements of the length and develop a model for how the mass and length are related.
Pro Tip: On a computer, after you pause a YouTube video you can move one frame at a time with the comma and period keys. This might help you choose the exact frame you want to make your measurement from.
Here are masses I used and the rough times when I put them on:
1:23... 10 grams
1:49... 20 grams
2:21... 50 grams
2:50... 70 grams
3:20... 100 grams
3:45... 150 grams
4:10... 200 grams
