2 The Metric SystemThe metric system is a decimal system of weights and measures.It is based on the unit of length called the METER.The metric system is now called, The International System of Measurement (SI for short).To get the meter, they divided a line from the north pole to the equator into 10 million parts!
3 Why do we use Metric System No numbers to memorizeEasy to say and writeConverts by multiples of 10Used all around the world
4 Units of Measurement Prefixes: Examples: Kilometer Hectometer Deca = 10(Base Unit)= 1Deci = .1Centi = .01Milli = .001Examples:KilometerHectometerDecameter(Meter)DecimeterCentimeterMillimeter
6 Length: The standard unit of length in the metric system is the meter. Common length units:1 millimeter = 1 mm1 centimeter = 1 cm1 meter = 1 m1 kilometer = 1km
7 Let’s look at the meter: 1 meter is a little longer than 1 yard or 3 feet.There are 10 decimeters in 1 meterThere are 10 centimeters in 1 decimeter.There are 10 millimeters in 1 centimeterMeasuring length – p. 48The shell of the turtle in figure 2 is 8.8 cms, how many mms is this?
8 English to Metric Conversions ****You do not need to know these.1 inch = 2.54 cm1 foot = cm1 yard = .914 m1 mile = m1 mile = km39,370 inches = 1 kilometerfeet = 1 kilometer.62 miles = 1 kilometer
9 Let’s PracticeUse the meter stick or the metric ruler to measure the following: careful when choosing what unit to measure in…1. the length of your lab table2. the length of your science textbook3. the length of your partners hand4. the length of your own pinky finger5. the width of your pinky finger nail6. the width of your pencil point
10 Mass Mass is a measure of how much matter an object contains. The basic unit for mass is kilogram.How many grams = 1 kg?In the science lab, we willmeasure in grams.But…. what is a gram?
11 The difference between MASS and WEIGHTWeight = the force of gravity on an object.Mass = the amount of matter an object contains120lbs on Earth = 20lbs on the moon50 kgs on Earth = 50 kgs on the moon
12 Measuring MassTriple Beam Balance – a device for measuring mass in grams.Let’s learn the parts of the triple beam balance and practice measuring mass. Desktop text p. 49
13 TIME The SECOND is the standard SI unit used to measure time. There are 60 seconds in 1 minute.There are 60 minutes in 1 hour.
14 Measuring Volume Volume - the amount of space an object takes up. **The standard unit for volume is the literVolume of liquid = pour liquid into graduated cylinder and measure amountVolume of regular shaped solids = length x width x height in cms (cm3)Volume of irregular shaped solids (like a rock)= water displacement.
15 DENSITY Density = mass unit = g/cm3 volume = g/ml p. 52 Let‘s READ. p.53 Densities of common substances. Once you know an objects density, you can determine whether or not the object will float in a given liquid.Look at the chart, what is the density of water? Will Aluminum sink or float in water? Explain how you know
16 What is the density of a pencil with a volume of 4ml, and a mass of 24g? What is the density of an object with a volume of 12cm3, and a mass of 36g?Let’s find the Mass and Volume of our two wooden cubes…The density of water is 1g/cm3 or 1g/ml (1ml = 1cm3)