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I've added 'in classical physics' in the thread title because all the differences between them that I found on the internet involved relativistic physics. It was something like both momentum and kinetic energy being components of a four-momentum or something like that. But I cannot understand those concepts.
These two quantities were defined before there was any relativistic physics. In classical physics, both of them are a quantitative way to express the amount of motion contained in a body. So, I need an intuitive explanation of why do we need to define both of these two quantities.
These two quantities were defined before there was any relativistic physics. In classical physics, both of them are a quantitative way to express the amount of motion contained in a body. So, I need an intuitive explanation of why do we need to define both of these two quantities.