Mass
The mass of an object is the a measure of an object's resistance to acceleration, sometimes also called "Inertia". For instance, a mountain has more mass then a rock. Mass shouldn't be confused with the related but quite different concept of weight.
A large mass, like Earth, will attract a small mass like a human being with enough force to keep the human being from floating off into space. This is called "Mass attraction"and is another word for gravity.
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We can see mass when weighing two different objects using a scale.
We can see mass when weighing two different objects using a scale.
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