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P1.1-1.4 Motion (Shi Yu) (Mass and weight (Mass is the nature of an object…
P1.1-1.4 Motion (Shi Yu)
Mass and weight
Mass is the nature of an object, its how many substances do they contain, so the mass is the constant.
Weight is caused by gravity. The fundamental reason is gravity.
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When the g growth, the mass will decrease
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Density
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measuring volume by displacement :
1.Select a measuring cylinder that is about three or four times larger than the object. partially fill it with water, enough to cover the object. note the volume of the water.
2.Immerse the object in the water. the level of water in the cylinder will increase. the increase in its volume is equal to volume of the object.
Determine the density of liquid and of a regularly shaped solid :
liquid : use measuring cylinder and electronic balance
solid : use rule and electronic balance
Length and time
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Common unit of length :
Millimeter (mm),
centimeter (cm),
decimeter (dm),
kilometer (km),
meter (m),
micron (um),
nanometer (nm)
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