Fisika Dasar adalah mata kuliah atau kajian ilmu fisika yang mempelajari prinsip-prinsip dasar alam, seperti gerak, gaya, energi, gelombang, panas, listrik, magnet, cahaya, hingga fisika modern

Fisika Dasar adalah mata kuliah atau kajian ilmu fisika yang mempelajari prinsip-prinsip dasar alam, seperti gerak, gaya, energi, gelombang, panas, listrik, magnet, cahaya, hingga fisika modern. Biasanya menjadi fondasi bagi mahasiswa sains, teknik, maupun kedokteran.

1. BasicPhysics
LIDA USU
Week of 1
Measurement and Magnitude

2. KuliahFisikaDasar
AssesmentComponents
•CM (20%)
•PBL (30%)
•Quiz(10%)
•Task(5%)
•MidSemester Examination(15%)
•Final Semester Examination(20%)
ClassRules
•Nosmoking
•Cellphones& allcommunicationdevicesare set tosilentmode duringlectures
•Noeatingin class
•You maydrink(onlythosewithclosedbottles) as long as theydon'tdisturbotherstudentsand
don'tspillthem
•Wearpoliteandneatclothes(don'twearshortsorotherskimpyclothes)
•Wearshoeswhileoncampus
•Minimum attendanceof80% tobeallowedtotaketheUAS
•Arrivinglatetoclassformorethan15 minutesispermittedtoenterclassbutPresenceis
consideredNOT ATTENDANCE
•Eachexam/taskcollectedmustalsoincludeasignedstatementthattheexam/assignment
collectedistheresultofyourownwork, not cheating

3. Student
AttitudeandBehaviorofaStudent
•More independentstudy
•Lookforbooksandpracticequestionsyourself
•Set yourowntime
•Havearolein society, set agoodexampletosociety
•Thinkmoremature, criticalforhimselfandhis future

4. MeasurementandMagnitude

5. The standardsofLength, Mass, andTime
LengthUnitQ:Howhighistheflood?
A:Maybe in heel, waist, etc
Is thistrue?
True, butnot standard(not everyoneunderstands, not everyonehas thesame
waistheight)
In 1120 theKing ofEnglandmadealengthunit withthenameYard, namelythe
distancefromhis nosetotheendofhis outstretchedarm
In 1799, Franceissuedastandardoflength, namelymeters(m), 1/10 millionofthe
distancefromtheequatortothenorthpolethatpassesthroughParis, butthis
definitionhas beenupdatedbasedonthejourneytraveledbylightin avacuumin
1/2.999 ×108seconds.

6. MassUnit
•The SI Fundamental unit ofmass, the
kilogram (kg), isdefinedas themassofa
specificplatinum-iridium alloykeptatthe
International BureauofWeightsand
MeasuresatSevres, France
Time Unit
•Beforein 1967, thestandardunit oftimewasdefined
in termsoftheaveragenoon, whichisthetimeit
takesthesun toreachitshighestposition(noon).
•In 1967, secondswere definedbyadevicecalledan
atomicclockwhichhad highprecision. By measuring
theatomicvibrationsofcesium, onesecondisdefined
as 9,192,631,70 timesthevibrationalperiodof
cesium-133 radiation.

7. International System
•In 1960 theinternationalcommitteeapprovedastandardsystemcalledSI (Le Système
internationald'unités) in FrenchortheInternational System.
PrefixSatuanSI
•The7basicSIunitsandtheirassociationswithotherunits.
•Fromtopclockwise:kelvin(temperature),seconds(time),meters(length),kilograms
(mass),candela(luminousintensity),moles(amountofsubstance)andamperes(current).
•Thesecond,kelvinandkilogramareindependentofanyotherbaseunit.Themeteris
definedbythespeedoflight,soitsvaluedependsonthedefinitionofthesecond.
1 kilogram (kg) = 103 gram (g)
1megavolt(MV)=106volt(V)

8. DimensionalAnalysis
•Dimensionsare neededtoprovewhetheraquantityrepresentsthe
sameordifferentphenomenonorquantities
Exercises
Supposetheaccelerationaofarotatingparticle
withuniformspeedvwithradiusrisdirectly
proportionaltornandvm.Determinethevaluesof
nandmandwritethesimplestformofthe
equationforacceleration!
L
M

9. Exercises
Jawaban
!=#$!%"
!"
"
!!+"
""
!
"2=!!=
$+ '=1dan'=2
$=−1
−1 2.2
/=01.=01
Writeanequationawitha
dimensionlessconstantk
Enterthedimensionsa, r,
andv
EquatetheL andTexponentsso
thatthedimensionalequations
balance
Solvethetwoequations
tofindthevalueofn
Sotheaccelerationequation
L
M
Supposetheaccelerationaofarotatingparticlewithuniformspeedvwithradiusr
isdirectlyproportionaltornandvm.Determinethevaluesofnandmandwritethe
simplestformoftheequationforacceleration!

10. Unit Conversion
Sometimesweneedtochangeunitsfromonemeasurementsystemtoanotheroreven
changeunitswithinthesystem. For example, conversionbetweenSI andUS systems
1mil=1609m=1,609 km
1ft=0,3048 m=30,48cm
1in.=0,025m=2,54cm
Like dimensions, unitscanbetreatedas algebraicquantitiesthatcanbe"crossout"
eachotherExample: Since 1 inchis2.54 cm, then
Exercises
On thefreeway, acaristravelingat38
m/s. Didthedrivercrossthe75
mile/hourspeedlimit?

11. Solution
Drivercrossedthespeedlimit!!
On thefreeway, acaristravelingat38
m/s. Didthedrivercrossthe75
mile/hourspeedlimit?

12. SignificantFigures(Important)
Varioustypesofuncertainty(error) in measurement:
Toolquality
Tooluserskills
Numberofmeasurementstaken
Etc
Significantfiguresorsignificantfiguresare relatedtodigital numericdigitstoexpressmeasurement
results.
Example:
Measuretheradius ofaCD discusingaruler.
We knowthatthesmallestscaleoftheruleris0.1 cm sotherulerishas anuncertaintyof±0.1 cm,
thenthesignificantfiguresoftheCD measurement. is(6.0 ±0.1) cm
Zero canbeasignificantfigureornot.
Example: thezerosin 0.03 or0.0075 are not significant. At 0.03 thereisonly1 significantfigure, i.e. the
3 zerosin 1500 gisveryambiguousbecausewedon'tknowwhetherthetwozeroswere usedto
allocatethedecimalpointorwhethertheyrepresentsignificantfigures.
Thenthewritingmethodisusedas follows: 1.5 ×103 g(ithas 2 significantfigures) or1.50 ×103 g
(ithas 3 significantfigures)
•Whenmultiplyingmultiplequantities, the
numberofsignificantfiguresisequalto
thenumberofsignificantfiguresin the
multiplierquantitythathas thefewest
significantfigures. Soisthecasewith
division.
•→ A= πr2 = (3.14)(6.0 cm)2 = 1.1×102
cm2
•Whennumbersare addedorsubtracted,
thenumberofdecimalplacesin theresult
mustequalthenumberofleastdecimal
placesin thequantityaddedor
subtracted.
•→ 23.2 + 5.174 = 28.4
Significantfiguresin theoperations
multiply, divide, add, andsubtract

13. Task 1
1.Order thefollowing5 quantitiesfromthelargesttothesmallest. If thereare 2 ofthesamequantity, write
themin thesameorder!
2.(a) 0.032 kg, (b) 15 g, (c)2.7×105 mg, (d) 4.1×10-8 Gg, (e)2.7×108 μg
3.(a) If anequationisdimensionallycorrect, doesthatmeanitmustbetrue?
4.(b) If anequationisdimensionallywrong, doesthatmeanitmustbewrong?
3. AnswerwithYes orNo. The twoquantitiesmusthavethesamedimensions(a) If weaddthe
twotogether
If wemultiplythetwo
If wesubtractthetwofromeachother(d)If wedividethetwofromeachother(e)If weequate
thetwo
4.The priceofgasolineatagas stationis1.5 Euro/liter. An American studentcanafford25 Eurosofgasoline. Knowingthat4 litersofgasoline
equals1 gallon, howmanygallonsofgasolinecanhe buy?
5.Astudentusesatape measuretomeasurethethicknessofatextbookandfinds4.3 cm ±0.1 cm. Otherstudentsmeasuredthethickness
usingavernier caliperandgot differentresults: (a) 4.32 cm ±0.01 cm, (b) 4.31 cm ±0.01 cm, (c)4 .24 cm ±0.01 cm, (d) 4.43 cm ±0.01 cm.
Whichofthese4 results(ifany) matchtheresultsthefirststudentgot?
Vernier calipers

14. ThankYou