<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied . It also determines the strength of its mutual gravitational attraction to other bodies . The basic SI unit of mass is the kilogram (kg). </P> <P> In physics, mass is not the same as weight, even though mass is often determined by measuring the object's weight using a spring scale, rather than balance scale comparing it directly with known masses . An object on the Moon would weigh less than it does on Earth because of the lower gravity, but it would still have the same mass . This is because weight is a force, while mass is the property that (along with gravity) determines the strength of this force . </P>

What is the definition of mass of an object
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