Have you ever asked yourself this question? I'm sure you have... Especially when you leave an umbrella at home on the door handle, you want to know what to do. I found an answer to this question in this great video on Minutephysics.
Besides this one, they have a lot of simple explanation to some tough questions :) As they say, "If you can't explain it simply, you don't understand it well enough".
Hope you will enjoy:)
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