3 Mass Mass is measured in grams or kilograms. The tools that you use for measuring mass are a triple-beam balance or a scale.
4 WeightThe force of gravity pulling down on an object.
5 On planet earth, an object’s weight is the same as its mass. Weight = 6,000 kgMass = 6,000 kg
6 Ex: weight would change in space or on another planet Earth = Weight = 6,000 KgHowever, an object’s weight can change, depending on the amount of gravity.Ex: weight would change in space or on another planet*Empty Space*Weight = 2,262 KgWeight = 14,184 KgWeight = 0 Kg
7 VolumeThe amount of space that is taken up by an object.
8 VolumeVolume is measured in cubic centimeters (cm3) or cubic meters (m3)Volume of liquids is measured in milliliters (ml) or Liters (L)
9 Volume of a box Length X width X height = volume 4 cm3 cm8 cm8cm X 3cm X 4cm = 96 cubic centimeters
10 Water DisplacementUsed to find the volume of an irregular solid….like this toy dinosaur
11 Measure the water level with and without the dinosaur ***Difference in volumes = volume of the object!
12 water level with object – water level without object = volume of object
13 77 – 47 = 30 cm3 Graduated Cylinder with out marbles 102030405060708090100102030405060708090100Graduated Cylinder with out marblesCylinder with marbles77 – 47 = 30 cm3
14 DensityThe formula for density is D=m/vOR Density = massvolume
15 Don’t forget the formula for density, or you will break Mrs Don’t forget the formula for density, or you will break Mrs. Szerdy’s heart!MV
16 If the object has a mass of 74 grams, and a volume of 8 cm3 What is the density? 74g/8 cm3 = 9.25 g/cm3
17 2. If the object has a mass of 10 grams, and a volume of 20 cm3 What is the density? 10g/20 cm3 = 0.5 g/cm3
29 A small object can have high density. Ex: a coin is heavy for its size and will sink in water.
30 A small object can have low density. Ex: a balloon is light for its size and will float in water or air.
31 A large object can have high density. Ex: a boulder is very heavy for its size and will sink in water.
32 A large object can have low density. Ex: an elephant is less heavy for its size and will float in water.
33 ***The density of water = 1*** Objects with a density of less than 1 float in water***The density of water = 1***Objects with a density of more than 1 sink in water
34 Will it float?Mass = 52 gVolume = 35 cm352g / 35 cm3 = 1.48 g/cm3
35 Will it float? Mass = 270 g Volume = 317 cm3 270g / 317 cm3 = 0.85 g/cm3
36 Will it float?Mass = 4 gVolume = 10 cm34g / 10 cm3 = 0.4 g/cm3
37 A material’s density can be used to identify it. The density of gold is 19.3 g/cm3Which of the following substances is gold?Rock AMass = 108 gVolume = 12 cm3Rock BMass = 126 gVolume = 15 cm3Rock CMass = 386 gVolume = 20 cm3108g / 12 cm3= 9 g/cm3126g / 15 cm3= 8.4 g/cm3386g / 20 cm3= 19.3 g/cm3
38 Find the density of these 3 pieces of gold Small Piece of GoldMass = 386 gVolume = 20 cm3Medium Piece of GoldMass = 1158 gVolume = 60 cm3Large Piece of GoldMass = 5018 gVolume = 260 cm3386g / 20 cm3= 19.3 g/cm31158g / 60 cm3= 19.3 g/cm35018g / 260 cm3= 19.3 g/cm3
39 A material’s density is always the same A material’s density is always the same! It does NOT change with its size.All samples of gold have the same density!!! It does not matter how large the piece is.