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Metric System

Metric System. 7 th Grade Notes 2011. Bell Work. Please get our your signed syllabus sheet Please get out your science journal and begin answering the following questions in complete sentences What instrument is used to measure length?

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Metric System

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  1. Metric System 7th Grade Notes 2011

  2. Bell Work Please get our your signed syllabus sheet Please get out your science journal and begin answering the following questions in complete sentences • What instrument is used to measure length? • Why do you think it is important to know how to measure length?

  3. Metric System • Referred to as the international system of units or SI • Based on the number 10 • Measuring system used by all scientists • Used to measure length, volume, mass, weight, density, and temperature

  4. Length • Used to measure from one point to another • Instrument used to measure length is the metric ruler • Basic unit of length is the meter • kilometer- km • hectometer- hm • decameter- dam • meter-m • decimeter- dm • centimeter- cm • millimeter – mm • In space, distance is measured in light years • A light year is the distance light travels in a year

  5. Bell Work 8/17/10 • What is the metric system used to measure? • What is the metric system referred to as? • What is the basic unit for length? • In space, what is distance measured in?

  6. Homework 8/17/10 Practice measuring the following items at your house. Remember to use centimeters as your unit. • The width of your front door • The height of a glass or cup • One item of your choice • For each write down the item and the measurement for the item

  7. Bell Work 8/18/10 Using a ruler and centimeters (cm) measure the length of the lines on the piece of paper at your table. Please share with your partner and don’t write on the paper. Example: 6.3 cm • Length of line 1: • Length of line 2: • Length of line 3: • Length of line 4:

  8. Volume • Volume is the amount of space an object takes up • Volume can be measured for liquids and solids.

  9. Volume (cont.) 3. Liquids – The basic unit for liquid volume is the Liter ___________________________L______________________ 4. The instrument used to measure liquid volume is the graduated cylinder 5. When measuring liquid volume you measure to the meniscus

  10. Volume (cont.) • Solids Basic unit of solid volume is cubic meters (m3) • cubic kilometer- km3 • cubic hectometer- hm3 • cubic decameter- dam3 • cubic meter-m3 • cubic decimeter- dm3 • cubic centimeter- cm3 • cubic millimeter – mm3 7. The instrument used to measure solid volume is a meter stick.

  11. There are 2 Ways to Measure Solid Volume 1. Length x Width x Height 2. Water Displacement using a graduated cylinder Steps • Record the volume of the water in the cylinder • Place the object in the cylinder and record the new volume 3. Complete the following math problem: Measurement 2 – measurement 1 = volume of the object

  12. Bell Work 8/19/10 • What is volume? • What is the basic unit for liquid volume? • What is the basic unit for solid volume? • How do you calculate the volume of a solid?

  13. Bell Work 8/20/10 1. What is the volume of a solid with these measurements? Length 3 cm width 2 cm height 4 cm 2. How do you find the volume of an irregular solid?

  14. Mass • Mass is the amount of matter in an object. 2. The basic unit for mass is a gram ___________________________g_______________________ 3. The instrument used to measure mass is a triple beam balance

  15. Bell Work 8/23/10 Please use complete sentences. • What is mass? • What instrument is used to measure mass?

  16. Bell Work 8/24/10 Please use complete sentences. • What basic units do we use to measure volume? • What basic units do we use to measure length? • What basic units do we use to measure mass?

  17. Density • Shows a relationship between mass and volume • To calculate density we divide mass by volume • d=m/v • Units for density depend on size of object • Large objects = kg/L • Small objects = g/mL

  18. Bell Work 8/25/10 Find the density of an object with 1. m=50g v=5mL 2. m=200kg v=2L

  19. Temperature • Measured in degrees Celsius • Instrument = Thermometer • Freezing = 0 degrees Celsius • Boiling = 100 degrees Celsius

  20. Bell Work 8/26/10 Please DO NOT touch the microscopes!!! • What instrument is used to measure temperature? • What is the freezing point in degrees Celsius? • What is the boiling point in degrees Celsius?

  21. Bell Work 8/27/10 Find the density of the following objects • m = 20 g v = 4 mL • m = 60 kg v = 2 L • m = 8 g v = 8 mL

  22. Weight • Weight is the measure of attraction between objects due to gravity. • Basic unit of weight is the Newton (N)

  23. Bell Work 8/30/10 Please get a new pink bell work sheet from the counter by the sinks. • What is weight? • What unit is weight measured in? • How many centimeters are in a meter?

  24. Bell Work 8/31/10 • 1000 g = ______ kg • 200 mL = ______ L • 1 m = ______ Dkm • 77 g = ______ mg

  25. Bell Work 8/28/09 • 25 kg = ______ mg • 345 cL = ______ HL • 980 m = ______ mm • 23700 g = ______ kg

  26. Bell Work 9/1/10 • 98 Hg = ______ mg • 222 KL = ______ L • 2706 mm = ______ Dkm • 5 g = ______ kg

  27. Bell Work 09/2/10 What is the basic unit for the following? 1. Length 2. Volume 3. Mass

  28. Bell Work 9/3/10 • What is the abbreviation for cubic centimeters? • What number is the metric system based on? • What is used to measure the mass of objects?

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