2 Way Back When . . .When people first started to measure things, the systems were different in different parts of the world.Many systems were based on parts of the body.Foot Inch
3 History of Metric System Developed by the French in the late 1700’s.Based on powers of ten.
4 History of Metric System Developed by the French in the late 1700’s.Based on powers of ten.Used by almost every country in the world, with the notable exception of the USA.Especially used by scientists.Abbreviated SI, which is French for Systeme International.
5 Why the Metric System?NASA still works in imperial units and has had difficulty when needing to work with other groups that use metricIn 1999 the Mars Climate Orbiter was lost because the altitude control system used imperial units (English Standard) and the navigation software used metric.
6 Metric SystemUnits can be scaled by factors of 10 depending on what you are measuringSo it can be used for small measurements as well as largeKilo- Hecto- Deca- Base- Deci- Centi- Milli-
8 MassMass is the amount of matter that makes up an object.
9 Mass Mass is the amount of matter that makes up an object. A golf ball and a ping pong ball are the same size, but the golf ball has a lot more matter in it. So the golf ball will have more mass.The mass of an object will not change unless we add or subtract matter from it.
10 Mass Unit used: Gram (g) Tool Used: Balance A paper clip has the mass of about 1 gram.
11 Weight Weight is a measure of the force of gravity on an object. Your weight can change depending on the force of gravity. The gravity will change depending on the planet you are on.The unit for weight is the Newton (N).
12 WeightWeight is a measure of the force of gravity on an object.
13 Weight and Mass Earth 1 gravity Moon 1/6th gravity Jupiter 2.5 gravitiesmass30kgweight300N50N750NJill’s mass remains the same on earth and the moon, but her weight changes due to different gravitational forces.
14 Length Length is the distance between two points. Unit used: Meter (m) Tool Used: Ruler or meter stick
15 Volume Volume is the amount of space an object takes up. Unit used: Liter (l)Tool Used: graduated cylinder
16 Volume Volume is the amount of space an object takes up. Unit used: Liter (l)Tool Used: graduated cylinderLiquids form a meniscus (curved, upper surface)To correctly read the volume, read the bottom of the curve.
17 Volume V = Length x Width x Height We can find the volume of box shapes by the formula:V = Length x Width x HeightWe can use water displacement to find the volume of irregular shaped objects
18 VolumeEx: We can put water in a graduated cylinder. If a rock causes the level to rise from 7 to 9 ml, the rock has a volume of 2 ml.1cm3 water =1 ml of water = 1 gram
19 DensityDensity is the amount of matter (mass) compared to the amount of space (volume) the object occupies.Unit for density is g/ml
20 DensityDensity is the amount of matter (mass) compared to the amount of space (volume) the object occupies.Unit for density is g/mlEquation:
21 Temperature Unit used: Celsius (C) Tool Used: Thermometer 0o Celsius= freezing100o Celsius= boiling32o F= freezing point212o F= boiling point
22 Metric System Base unit Meter (m) Liter (L) Gram (g) 1 Prefix AbbreviationPower of 10Kilok1000Hectoh100Dekada10Base unitMeter (m)Liter (L)Gram (g)1Decid0.1Centic0.01Millim0.001
23 Conversions King Henry Died By Drinking Chocolate Milk If moving to the right, move the decimal to the right that many steps.If moving the left, move the decimal to the left that many steps.
24 Practice ProblemsConvert 15 grams (g) to kilograms (kg)
25 Practice ProblemsConvert 115 millimeters (cm) to decimeters (mm).