eli5 How does inertia and impact work? Does moving make a stronger or weaker impact for say punching something?
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to move something, you have to put energy into it, giving it a velocity in a given direction.
inertia is literally that energy. your trying to move it in a new direction, but the object still has energy pushing it in the original direction, and you need to counteract and overcome that to change the direction of travel.
in terms of impact, its not really possible to have a impact without inertia, as that would imply no movement. So, you could say its vital to impact happening.
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