eli5, when a moving object bounces off of another, does it momentarily stop moving?
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Each part of it stops moving momentarily, but not all at the same time. By the time the back of the object stops and changes direction, the front of the object is already going back the other way.
You can probably find videos of squishy objects colliding and bouncing off each other. You can certainly imagine it. It’s almost like the front of the ball turns around and goes back to tell the back of the ball that it hit something and it needs to go back. Objects that seem rigid to us aren’t actually perfectly rigid, they do this too, but with less physical compression involved
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