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MASS Versus WEIGHT
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DEFINITIONS
Mass- the amount of matter an object has.
Matter- something that has mass and takes up space.
Weight- is the amount of force by which an object is pulled by gravity, it is not constant it depends upon gravity.
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5. Units for Measuring Mass
Mass is measured in grams and kilograms.
1 paper clip= 1 gram
1000g=1 kilogram
The average human adult weighs 75kg.
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Weight
The weight of a mass is the force that the earth pulls on the mass. The entire idea of weight can be understood as the force of gravity on something. The whole idea of weight is related to the force of gravity.
 In the metric system force is measured in newtons hence weight is also measured in newtons. You will learn later that on the surface of the earth, a mass of 1 kilogram weighs 9.8 newtons.
Weight changes depending on how much gravity you have pulling on you - the same truck would be lighter on Mars or on the Moon, and it wouldn't weigh anything at all in space, but it would always have the same mass.
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COMPARE AND CONTRAST
MASS vs WEIGHT
Always remains constant Depends on gravity
Does not depend on gravity weight=mass x gravity
weight of an object
changes if the gravity
changes
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