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is how much it hates to accelerate in response to a force.
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Newton tells you forces cause acceleration.
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But the acceleration is not the same on different objects.
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Certain objects resist it more than others.
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They are said to have a bigger mass.
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We can be precise about how much bigger by saying,
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"If the acceleration of a body to a given force
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is ten times that of a one kilogram mass,
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then this mass is one-tenth of one kilogram."
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This is how masses can be tabulated using a spring.
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Imagine then from now on,
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we can find the mass of any object, right?