9First move big rider, then middle rider, then small rider. WHEN MEASURING MASSFirst move big rider, then middle rider, then small rider.213
10MASS vs. WEIGHT Mass – Amount of matter (stuff) something contains. Weight – Amount of matter (stuff) something contains + GRAVITY.The weight of an object depends upon where the object is located because gravity changes with where you are. The mass of an object does not change. If you were on the moon, your weight would change, but your mass would stay the same.
12Volume How much space an object takes up. The basic SI unit of volume for liquids is the liter (L).The basic SI unit of volume for solids is the cubic centimeter (cm3)Use a graduated cylinder to measure volume of a liquidUse a meter stick to measure length, width, height to measure volume of a solid
141mL = 1cm3 VERY IMPORTANT !! This gives us a relationship between volume of a liquid and volume of a solid
15Volume TO MEASURE THE VOLUME OF A SOLID THAT IS SHAPED WEIRD: Place the object in water. Measure the volume of the water before you put the object in and measure the volume after you put the object in. Subtract the volumes and the difference is the volume of the object.
17Volume of something shaped weird 41mL – 35mL = 6 mL or 6 cm3
18What is density?Tells how airy a substance is. It relates mass and volume togetherThe density of a substance is the same for all pure samples of that substance.Example: all samples of gold have a density of 19.3 g/cm3 . You can tell fake gold from real gold by measuring the densities.The basic SI units of density for solids are: grams per cubic centimeter (g/cm3)The basic SI units of density for liquids are: grams per milliliter (g/mL).
19Density units = depend upon units of volume used. VERY IMPORTANT!!Density = m / vDensity units = depend uponunits of volume used.g/cm3g/mLsolidliquid