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What is mass?
Measure of the quantity of matter in an object at rest. It is a scalar quantity
What is weight?
A gravitational force on any object that has mass. It is a vector quantity
What is gravitational field?
A region of space in which a mass exerted a force of attraction on another mass
Formula for calculating gravitational field strength:
Weight (Gravitational Force) / Mass of an object
What is density?
Mass per unit volume