mass Unlike an object’s weight, an object’s mass will not change if the force of gravity on it changes.
definition formula SI units mass measure of how much matter an object contains kilogram (kg) gram (g) volume amount of space that matter occupies length X width X height (l . w . h) cm 3 (solids) liter (L) milliliter (mL) density measure of how much mass is in a given volume mass volume g/cm 3 g/mL
Volume is found by multiplying the measurements of length, width, and height. L x W x H Answer = cubic centimeters (cm 3)
How can you measure the volume of an object with an irregular shape, such as a rock? One way is to put the object in a graduated cylinder containing water and measure the change in the volume of the water. Answer is in mL not cm 3
density density of water = 1.0 g/mL (1.0 g/cm 3 )
A small block of wood floats on water. It has a volume of 25 cubic centimeters and a mass of 20 grams. What is the density of the wood? Density= Mass Volume Density= 20 g 25 cm 3 Density= 0.8 g/cm 3
Density Problems Coin Mass (g) Volume (cm 3 ) Density (g/cm 3 ) A 2.5 g 0.5 cm 3 B 4.8 g 0.08 cm 3 C 7.2 g 2.4 g/cm 3
Activity pg. 28 - Making Sense of Density Object Mass (g) Volume (cm 3 ) Density (g/cm 3 ) Whole Wooden stick Piece 1 Piece 2 Whole Modeling clay Piece 1 Piece 2 Whole Crayon Piece 1 Piece 2 Rock Marble
density measure of how much mass is in a given volume
Which liquid has the greatest density? Water, corn syrup, or vegetable oil? Hypothesis: I predict that the ________ will have the greatest density because _______________. Observations: ______________ Before After 3. Corn syrup 2. Water 1. Vegetable oil 3. 2. 1.
Matter of Density Object Floats or sinks Density compared to water Marble Wood Ironwood Japanese yen Granite Pumice rock Penny