An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an outside force.
In this example, the hoop is acted upon but the pen cap is not. As a result, the pen cap falls straight down into the top of the bottle.
I used a glass bottle, but it would be a good idea to use a plastic bottle in case you accidently pull the hoop down slightly.
Check my website www.monkeyvsgravity.com or my YouTube channel http://www.youtube.com/user/ThirstForScience for more!
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