eli5. What does inertia mean?
In: Physics
Inertia is basically mass. It can be thought of as the property of a material that opposes changes to its motion, the m in F=ma. The greater the inertia, the harder it is to stop or get moving. If you imagine being in space, on the ISS for example and you have two identical suitcases, one empty and one full of rocks. If you pushed them both with the same force, the empty one will move away faster because it has less inertia. Objects in Space are apparently weightless, but not massless.
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