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SHOCK HORROR
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A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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That's a pretty gross oversimplification of inertia. The more mass an object has, the more energy that's required to accelerate it.
The genius lies in the understanding that a heavy object, once moving, will prefer to continue moving than come to a rest. This is why an 18-wheeler needs more distance to stop than a small car. Some people's intuition tells them that a heavy object will come to a rest quickly.