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Mass is a measure of the amount of matter in an object, typically measured in kilograms (kg). It is a scalar quantity and does not change regardless of the object's location.
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Inertia: The tendency of an object to resist changes to its state of motion. It is directly proportional to the object's mass.
Force: $F = ma$: A push or pull acting upon an object as a result of its interaction with another object.
Weight: The force exerted on an object due to gravity, calculated as $W = mg$, where $g$ is the acceleration due to gravity.