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The property of an object that determines how much it responds to a force in Newtonian mechanics, and how much it interacts with gravity in the Newtonian framework. Mass also refers to the intrinsic energy of a particle in particle physics. This tag does also cover effective mass.

4 votes

True or False: energy is conserved in all collisions

In any situation you will encounter, most notably using mere introductory physics, it is "true". Energy is always conserved, but gets quite handily transmuted between different forms. As a last resort …
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