Presentation on theme: "Nature of Science - Notes I"— Presentation transcript:
1 Nature of Science - Notes I Objective:Use triple beam balance, meter stick,and graduated cylinderPoint out that objectives are what they are responsible for KNOWING in this class. All notes, activities, and tests will be based on the OBJECTIVES for the course
2 an instrument used to measure mass Triple Beam BalanceWhy is it called a triple beam balanceDiscuss difference between QUANTITIES and UNITSExample: Time - min, hr, sec,years, etcLength – feet, meters, miles, etcan instrument used to measure mass
3 units - kilograms or grams mass- Amount of matter in an objectunits - kilograms or gramsweightMeasure of the pull of gravityon an objectWould MASS change if you go to the moon?Would WEIGHT change if you go to the moon?Pass around 1 kilogram1 gram is the mass of a paperclip1 Newton weighs about a ¼ pound ---- a stick of butterunits - Newtons
4 Using a Triple Beam Balance 1. Transporting and storing the balanceAlways use 2 hands ; do not allow pan to moveStore with all mass all the way to the leftDemonstrate carrying balance; emphasize expense -- $100 each and consequence for horseplay in labIdentify location of balances in classroom and teacher policies on handling equipment..
5 Using a Triple Beam Balance 2. Zero the balanceSlide all masses to leftAdjust thumbscrew until arrow stays on zero lineDemonstrate placing object on balance
6 Using a Triple Beam Balance 3. Placing object on panGENTLY!! There should be no sound.Never press on the pan with your hand.Demonstrate placing object on balance
7 Using a Triple Beam Balance 4. Determine measurementSlide large mass one at a time until it “bottoms over”, then move it BACK oneSlide medium mass one at a time until it“bottoms over”, then move it BACK oneRead a step then demonstrate itSlide small mass at little at a time until it balancesAdd all 3 measurements for mass in grams
11 Example 3gggANSWER: = gramsPoint out that you DO need the .0 !! This instrument measures to the nearest 1/10 of a gram.
12 Example 4gggANSWER: = gramsSome students will want to call this 77 grams …… show where smallest mass would have to be for 77 g
13 2. Get triple beam balance and objects A, B, & C Mass Practice1. Form groups of 32. Get triple beam balance and objects A, B, & C3. Each person mass one object, others verify4. Record masses of objects A, B, & C on your paper5. Return balance and objectsEstablish acceptable noise level and pace right now!!Make known procedure for getting teacher assistance ie SILENT hand in airGive time limit ( 5 min?) for all equipment to be returned and students in seat!
14 an instrument used to measure length Meter StickReview difference between QUANTITIES and UNITSExample: Time - min, hr, sec,years, etcLength – feet, meters, miles, etcAsk students how big a meter isHow big a centimeter isHow many cm are in a meter?Show where meter sticks are kept in your rooman instrument used to measure length
15 Which side?!Point out that some meter sticks have ENGLISH units on one side.They need to know which side to use!!Show how inches are usually expressed as FRACTIONS, and meters are DECIMALS
16 To change centimeters to meters: _____________by _________ 1001 meter = _____ centimeters1/2 meter = _____ m = _____ cm.550To change centimeters to meters: _____________by _________divide100
17 34.2 cm = ______ m 158 cm = ______ m 3.7 cm = ______ m ______cm = 2 m Try these:34.2 cm = ______ m158 cm = ______ m3.7 cm = ______ m______cm = m______cm = m.3421.58.037Give students time to copy the GIVEN measurement, and then figure out the missing measurementStress LEARNING……don’t just wait for answers to come up…..don’t look at neighbor20011.1
18 Are the numbers METERS?? Or CENTIMETERS??34.4 cm m
20 2. Get meter stick and objects A, B, & C Length Practice1. Form groups of 32. Get meter stick and objects A, B, & C3. Each person measure one object, others verify4. Record lengths of objects A, B, & C on your paper5. Return meter stick and objectsRemind about acceptable noise level and pace.Make known procedure for getting teacher assistance ie SILENT hand in airGive time limit ( 5 min?) for all equipment to be returned and students in seat!
21 an instrument used to measure volume Graduated CylinderAGAIN Review difference between QUANTITIES and UNITSExample: Time - min, hr, sec,years, etcLength – feet, meters, miles, etcTalk about size of a liter and a mlPoint out a ml is a cm cubedan instrument used to measure volume
22 unit - liter or milliliter volumeamount of space anobject occupiesunit - liter or milliliter
23 Each line is worth? 10 ml How much water? 230 ml 300 200 100 There is NOT a place to put these answers on notes papersPoint out that different size graduated cylinders have different scales.First determine what each little line is worth on eachMeasure to lowest part of miniscus230 ml100
24 Each line is worth? .1 ml How much water? 6.8 ml 7 6 5 Note that this much be a much skinnier graduated cylinder6.8 ml5
25 70Each line is worth?602 ml50How much water?4056 ml3020
26 TRY THESE 1 mL 10 mL 37 mL 240 mL .1 mL 5 mL 6.6 mL 95 mL 40 30 Each mark:Amount of H2O:300200Each mark:Amount of H2O:1 mL10 mL37 mL240 mLStudents should write markings and draw water levels on notes sheets and answer questions.Again ---- stress engaging and learning!76Each mark:Amount of H2O:10050Each mark:Amount of H2O:.1 mL5 mL6.6 mL95 mL
27 in a graduated cylinder 3. Others verify Volume Practice1. Form groups of 32. Each person determinethe amount of waterin a graduated cylinder3. Others verify4. Record values on notes page& groupsheetInsist that students FOLLOW DIRECTIONS.Give non verbal cue for rotating to stations. (flash lights, blow whistl, etc)
34 What is the unit to measure MASS? REVIEWWhat is the unit to measure MASS?What quantity does a graduated cylinder measure?What device is used to measure MASS?gram or kilogramvolumeClick to show answerstriple beam balance
35 4. What is the LENGTH of the line? (include the UNIT) REVIEW4. What is the LENGTH of the line?(include the UNIT)Click to show answers26.1 cm
36 5. What is the MASS ?(include the UNIT) REVIEW5. What is the MASS ?(include the UNIT)gggClick to show answer415.5 g
37 6. What is the VOLUME of water? (include the UNIT) REVIEW6. What is the VOLUME of water?(include the UNIT)9878.8 mLClick to show answer