I'm guessing that a lot of people have seen this, but in case you haven't, you should.
This is a clear example of Newton's First Law, which says that an object in motion will want to remain in motion with the contest velocity, or if it is at rest, will want to stay at rest. The example of the latter is when you can pull a table cloth very quickly from underneath all the plates and cups that were on it. In this video, think of the shopping cart as the plants and cups, and the floor of the truck as the table cloth, and you get the idea.
Zz.
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