Upload
silvester-norton
View
226
Download
4
Tags:
Embed Size (px)
Citation preview
REMINDERSREMINDERS CalculatorsCalculators
Study design and textbooksStudy design and textbooks
Examiners report Examiners report
VASS systemVASS system
SSMSSSMS
Exam format - detailed studiesExam format - detailed studies
STATISTICSSTATISTICS
6544 students6544 students
Mean = 99 = 55%Mean = 99 = 55%
Std dev = 41.5 = 23%Std dev = 41.5 = 23%
Number achieving 100% = 4Number achieving 100% = 4
GRADEGRADE MIN (/180)MIN (/180) MIN (%)MIN (%)
A+A+ 153153 8585
AA 137137 7676
B+B+ 121121 6767
BB 103103 5757
C+C+ 8484 4747
CC 6767 3737
D+D+ 5252 2929
DD 3838 2121
E+E+ 2727 1515
EE 2020 1111
ChallengingChallenging
Detailed studiesDetailed studies
Attempt ONE detailed study onlyAttempt ONE detailed study only
Explanations address specific question. – Explanations address specific question. – DiagramsDiagrams
Show workingShow working
GENERAL COMMENTSGENERAL COMMENTS
Converting unitsConverting units
Calculations – powers of 10Calculations – powers of 10 - raising to power eg. R- raising to power eg. R33
- simple mathematics- simple mathematics
Care reading scale on axesCare reading scale on axes
Multiple choice questionsMultiple choice questions
Illegible writingIllegible writing
PROBLEM AREASPROBLEM AREASMOTIONMOTION
Q2 Light lands directly below seatQ2 Light lands directly below seat
Q5 Determining Q5 Determining ΔΔpp
Q9, 10 In spring formulae x is Q9, 10 In spring formulae x is extension not total lengthextension not total length
Q11 Total energy is constantQ11 Total energy is constant
Q12 Difficulty with ratiosQ12 Difficulty with ratios
Q13 Mathematical difficulties with RQ13 Mathematical difficulties with R33 and Tand T22
Q14,15 Treat horiz and vert Q14,15 Treat horiz and vert components. Derived equations components. Derived equations caused confusioncaused confusion
ELECTRONICS & PHOTONICSELECTRONICS & PHOTONICS
Q1,2 Improving, but still difficult for Q1,2 Improving, but still difficult for studentsstudents
Q3 Few provided a clear answerQ3 Few provided a clear answer
Q9 Explanations unclearQ9 Explanations unclear
Q10,11 Intensity of light cannot go below Q10,11 Intensity of light cannot go below zero zero
RELATIVITYRELATIVITY
Q2 Many unable to determine speed Q2 Many unable to determine speed of soundof sound
Q8 Determining appropriate frame of Q8 Determining appropriate frame of referencereference
MATERIALS & STRUCTURESMATERIALS & STRUCTURES
Q2 TorquesQ2 Torques
Q4 Locating point of tensionQ4 Locating point of tension
Q8 Work = Area of graph x Volume. Many Q8 Work = Area of graph x Volume. Many forgot volumeforgot volume
Q10 Torque or triangle of forces or Q10 Torque or triangle of forces or resolution of forcesresolution of forces
FURTHER ELECTRONICSFURTHER ELECTRONICS
Q5 Time constant – 63% changeQ5 Time constant – 63% change
10 Increased I 10 Increased I increased voltage increased voltage drop drop OROR Decreased load Decreased load
decreased decreased and increased ripple and increased ripple
Q11 Regulator, increase transformer Q11 Regulator, increase transformer output, increase capacitor output, increase capacitor
STATISTICSSTATISTICS
6392 students6392 students
Mean = 110 = 61%Mean = 110 = 61%
Std dev = 43 = 24%Std dev = 43 = 24%
Number achieving 100% = 14Number achieving 100% = 14
GRADEGRADE MIN (/180)MIN (/180) MIN (%)MIN (%)
A+A+ 164164 9191
AA 150150 8383
B+B+ 134134 7474
BB 114114 6363
C+C+ 9292 5151
CC 7474 4141
D+D+ 5454 3030
DD 3636 2020
E+E+ 2020 1111
EE 1010 66
GENERAL COMMENTSGENERAL COMMENTS
Accessible paperAccessible paper
Detailed studiesDetailed studies
Illegible writingIllegible writing
Explanations must address specific Explanations must address specific questionquestion
Explanations – one mark per pointExplanations – one mark per point
Show workingShow working
Unit conversions, eg. cmUnit conversions, eg. cm22 to m to m22
Powers of 10 calculationsPowers of 10 calculations
Transformation of simple equations.Transformation of simple equations.
Direction of current flowDirection of current flow
Diffraction – Light & Matter c.f. SoundDiffraction – Light & Matter c.f. Sound
Diffraction patterns – gradual change Diffraction patterns – gradual change as as λλ/w ratio varies/w ratio varies
PROBLEM AREASPROBLEM AREASELECTRIC POWERELECTRIC POWER
Q1,2 Sketching magnetic fields.Q1,2 Sketching magnetic fields.
Q11 Series circuit ideasQ11 Series circuit ideas
Q12 More power consumed than Q12 More power consumed than supplied supplied
Q15 Explain application of Lenz’s lawQ15 Explain application of Lenz’s law
LIGHT and MATTERLIGHT and MATTER
Q5, 6 Diffraction patternsQ5, 6 Diffraction patterns
Q9 Not interference effectQ9 Not interference effect
Q10, 11 Behaviour of bound and free Q10, 11 Behaviour of bound and free electronselectrons
SYNCHROTRONSYNCHROTRON
Q4 Application of right hand ruleQ4 Application of right hand rule
Q11 Explanations poorQ11 Explanations poor
PHOTONICSPHOTONICS
Q6 Snell’s lawQ6 Snell’s law
Q7, 8 Relate effect to speed Q7, 8 Relate effect to speed variationsvariations
Q11 Internal reflection – gradual Q11 Internal reflection – gradual change in amountchange in amount