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## Bell Ringer 9/16/13 – 3 minutes

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**Bell Ringer 9/16/13 – 3 minutes**START A NEW BELL RINGER SHEET! • What is volume? • How do you find the volume of a cube? • How do you find the volume of a liquid? • W5SAYWoS**Name (& nickname) Pd_______**• Who you live with (names and relationship) • What grade do you expect to earn in this class? • How do you learn best?What can I do to help you learn? • What are you good at? • What are you not so good at? • Favorite school subject? Why? • Interests (sports/activities/games/hobbies) • Movies; Bands/artists; sports teams you like • Planned future occupation**Today you are going to…**take notes on measurements So you can… Define length, mass, & volume and give the base units for each. Differentiate between mass and weight Explain the difference between fundamental and derived units You’ll know you’ve got it when you can complete the “Metric Measurement Questions” worksheet**2 Basic Measuring Systems**• Metric • Developed in 1790’s in France • Based on scale of 10 • Same base unit…uses prefixes for different sizes • English • Developed 100’s of years ago • No consistent scale • Uses different units for different sizes…all memorization**Types of Units**• Fundamental unit • Fundamental means “foundation or basis; basic” • Measured • Compared to a standard, accepted worldwide • Ex. ___________________________________ • Derived unit • Calculated (math done to find them) • Combination of fundamental units • Ex. ___________________________________ • The neat (important) thing about derived units is they often tell you how they were derived!!**Measurements in Science**• Most scientists and almost all countries use the International System of Units. • “SI Units” (metric system) • Why is the abbreviation “SI” instead of “IS”? • Length – meter (m) • Mass – gram (g) • Volume – liter (L) • Time – second (s) • Temperature – Kelvin (K) (but we’ll use Celsius oC)**Length**• the distance from one point to another • inches, feet, miles, millimeters, fathoms • The SI base unit of length is the meter. • 1 meter = 39.37 inches • What English unit most closely resembles a meter? • How does it compare to a meter? • The English system “base” is the inch. • 1 inch = 2.54 centimeters • Compare km, m, cm, & mm to mi, yd, in, & ½ in**Mass**• how much matter is in an object • Directly related to weight…but NOT the same • Weight is a FORCE (push or pull), mass is not • Weight changes with location, but mass does not • The SI unit of mass is the kilogram. • The English unit of mass is the slug. • We don’t use mass much in the U.S.A….we use weight instead. • That’s one of the reasons people get mass and weight confused!!!**Mass**Slug • It is a mass that accelerates by 1 ft/s2 when a one pound-force is exerted on it. • It weighs 32.17 lbs.**Volume**• Volume • how much space something takes up • English system – gallons (quarts, pints, cups, fluid ounces) • SI unit - liter • Dump water! • 1 mL = ___ cm3**Volume**• 1 liter = 1000 mL = 1000 cm3**Volume**• To find volume of a regular solid: • To find volume of irregular solid: • To find volume of liquid:**Temperature**• Temperature - measure of the average amount of kinetic energy of the molecules in a substance. • SI unit - Kelvin (K) • we usually use the Celcius (oC) scale • Room temperature 20 – 25o C • A warm sunny day 30o C. • Water boils at 100o C and freezes at 0o C.**Bell Work 9/18/13 - 5 min**• Define & give the SI & English units for: a. length b. volume c. mass 2. What are two ways mass and weight are different?**Today you are going to…**take notes on metric measurements So you can… Convert between metric units. You’ll know you’ve got it when you can complete “Metric to Metric Conversion Worksheet #1”**Metric Prefixes**Kevin Hates Dating Because Dating Costs Money Kilo HectoDeka Base DeciCentiMilli 1000 100 10 1 0.1 0.01 0.001**Extreme Metric Prefixes!**Mega (M) 1,000,000 (106) One million • Giga (G) 1,000,000,000 (109) One billion! • Tera (T) 1,000,000,000,000 (1012) One trillion! Kilo HectoDeka Base DeciCentiMilli 1000 100 10 1 0.1 0.01 0.001 • Micro ( μ) 1/1,000,000 (10-6) • Nano (n) 1/1,000,000,000 (10-9) • Pico (p) 1/1,000,000,000,000 (10-12)**Bell Work 9/15 – 5 minutes**• 1 km = __________ m kilo means ___________ • 1 m = __________ cm centi means __________ • 1m = _________ mm milli means __________ • Convert the following… • 25 kg = _________ g • 37 dam = ___________ cm • 90 mL = ______________ kL • 15 Mm = ___________________ m**25.5 g = ____________ dag**• 58.5 nm = ______________ dm • 90 mL = _________________ kL • 4.45 pm = _____________________________ mm**Common Mistakes**• Prefix M is Mega, prefix m is milli • m is NOT milli • Move the decimal, don’t just add zeros! • Don’t count your house (the unit you start on)! • The worst mistake is…GIVING UP! • The second worst mistake is…NOT ASKING FOR HELP!**Tip!**• If writing a tiny number (decimal with lots of places) leave a space between every three numbers. • 0.0000000000003454 meters • 0.000 000 000 000 345 4 meters**Bell Work 9/19/13 – 4 min**Get your homework out & turn it upsidedown on your desk so I can check it. • 6.0 kL = _________________________ L • 65 mg = _________________________ g • 895 L = _________________________ cL • 45 dL = _________________________ hL • 502 Gm = _________________________ cm**Bell Work 9/20/13 – 4 min**Get your homework out & turn it upsidedown on your desk so I can check it. Try using the chart above for this one! • 5.5 mL = _________________________ L • 650 dg = _________________________ g • 57 nm = _________________________ m • 4.45 TL = ________________________ ML • 50.2 pm = _________________________ nm**Bell Ringer 9/14 – 3 minutes**Identify the SI and English unit that would be used to measure… • Length of: A. Your foot B. A football field C. from here to Irwin D. from here to California E. an eyelash F. a cell • Volume of: A. Your head B. A thimble C. The school D. a Jacuzzi tub • Mass of: A. Your head B. a bowling ball C. The building D. an eyelash**Bell Work 9/26/12 – 4 min**Round the following numbers to the number of sig figs indicated. 1 Sig Fig 2 Sig Figs 3 Sig Figs Ex. 488.67 1) 521.2 2) 448.6 3) 0.086005 4) 48 000**Quiz**• 1 m = _________________ cm centi means _________________ • 1 m = _________________ mm milli means _________________ • 1 km = _________________ m kilo means __________________ • 23 kg = _________________ g • 8.25 g = ______________________ cg • 59 hg = ______________________ mg • 14 mm = ______________________ cm • 6.48 daL = ______________________ mL • 23.5 ML = ______________________ hL • 210 Mg = ______________________ pg**Bell Work 9/26 – 3 min**Convert all to mL • 456.0 L • 25.300 kL • 0.00020 nL • 490 TL • 85 daL • 1 000 dL**Today you are going to…**take notes on significant figures So you can… Explain the point of significant figures & know how to use them You’ll know you’ve got it when you can complete the worksheet**Significant Figures**• Sometimes not all of the digits in a number have meaning. • 7,000,000 taxpayers live in a certain city. • The city spent $6.2 million dollars on signs. • I weigh 150 lbs.**Bell Work 9/27/12 – 4 min**What is the point of significant figures? (c.s.)**Quiz**Take everything off ur desk for ze quiz!! **Significant Figures**Population of Pittsburgh example is good one, except that since it’s people it’s infinite! Have students measure things with different precision? You could have something close to the density of water & have students calculate the density using different instruments. The more precise ones would predict more accurately if it’ll float.**Significant Figures**What’s the difference between 4 cm and 4.00 cm?**Significant Figures**What’s the difference between 4 cm and 4.00 cm?