Technical Sciences PAT Experiment 1 Grade 12 2021 Marking Guidelines Afr Eng

Downloaded from hlayiso.com TECHNICAL SCIENCES TEGNIESE WETENSKAPPE MARKING GUIDELINES FOR PRACTICAL ASSESSMENT TASKS/ NASIENRIGLYNE VIR PRAKTIESE ASSESSERINGSTAKE GRADE 12 GRAAD 12 EXPERIMENT 1/EKSPERIMENT 1 2021 These marking guidelines consist of 5 pages./ Hierdie nasienriglyne bestaan uit 5 bladsye. Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/Tegniese Wetenskappe 2 DBE/PAT 2021 NSC/NSS – Marking Guidelines/Nasienriglyne EXPERIMENT 1/EKSPERIMENT 1: WORKSHEET FOR CONSERVATION OF LINEAR MOMENTUM/ WERKSKAART VIR BEHOUD VAN LINEÊRE MOMENTUM 1. PRACTICAL SKILLS/PRAKTIESE VAARDIGHEDE CRITERIA/KRITERIA MARKS/ PUNTE Precaution:  Cleaning the runway and the wheels of the trolleys.  Ensure that the mass balance (digital/manual) is at zero before measuring the mass of the trolleys. Voorsorg:  Skoonmaak van die trolliebaan en die trolliewiele   Maak seker dat die massabalans (digitaal/met die hand) op nul is voordat die massa van die trollies gemeet word  2 Set-up:  Ensuring that the track/rail is level longitudinally.   Ensuring that the track/rail is level sideways.   Locating a suitable starting position for the two trolleys so that they hit the barriers simultaneously.   Marking the initial position.  Opstelling:  Maak seker dat die trolliebaan in die lengte (longitudinaal) gelyk is.   Maak seker dat die trolliebaan sywaarts gelyk is.   Vind 'n geskikte beginposisie vir die twee trollies sodat dit die versperrings gelyktydig tref.   Merk die beginposisie.  4 Measuring skills:  Measurements of the masses of the trolleys.  Measuring the distance between the starting position and barrier for each trolley accurately.  Use of the timer or stopwatch (start, stop) accurately. Meetvaardighede:  Metings van trollies se massas   Akkurate meting van die afstand tussen die beginposisie en die versperring vir elke trollie   Akkurate gebruik van die tydreëlaar of stophorlosie (begin, stop)  3 TOTAL/TOTAAL 9 2. Runway not clean/Trolliebaan nie skoon nie  Stopwatch reading inaccurate/Onakkurate stophorlosielesings Inaccurate measurements of trolley displacement/Onakkurate trollieverplasingslesing (ANY ONE/ENIGE EEN) (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/Tegniese Wetenskappe 3 DBE/PAT 2021 NSC/NSS – Marking Guidelines/Nasienriglyne 3. Clean the trolley and the runway./Maak trolliebaan en trollie skoon.  Improve stopwatch handling skills./Verbeter stophorlosielesing- vaardighede. Ensure accurate displacement measurements./Maak seker meting van verplasing is akkuraat. (ANY ONE/ENIGE EEN) (1) 4. DATA REPRESENTATION AND INTERPRETATION OF RESULTS (NOTE: exemplar results) DATAVOORSTELLING EN INTERPRETASIE VAN RESULTATE (LET WEL: modelresultate) Without mass piece on the trolley/Sonder massastuk op die trollie: TRIAL/ TROLLEY/ MASS (kg)/ TIME (s)/ DISTANCE (m) PROEF TROLLIE MASSA (kg) TYD (s) (between initial position and barrier) AFSTAND (m) (tussen beginposisie en versperring) 1 A 0,546 1,4 0,60 B 0,550 1,4 0,58 2 A 0,546 1,34 0,61 B 0,550 1,34 0,59 3 A 0,546 1,36 0,62 B 0,550 1,36 0,60 Average/ A 0,546 1,37 0,61 Gemiddeld B 0,550 1,37 0,59 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/Tegniese Wetenskappe 4 DBE/PAT 2021 NSC/NSS – Marking Guidelines/Nasienriglyne With a mass piece on the trolley/Met massastuk op trollie: TRIAL/ TROLLEY/ MASS (kg)/ TIME (s)/ DISTANCE (m) PROEF TROLLIE MASSA (kg) TYD (s) (between initial position and barrier) AFSTAND (m) (tussen beginposisie en versperring) 1 A 0,546 1,4 0,62 B 0,757 1,4 0,58 2 A 0,546 1,3 0,63 B 0,757 1,3 0,57 3 A 0,546 1,26 0,63 B 0,757 1,26 0,57 Average/ A 0,546 1,32 0,6267 Gemiddeld B 0,757 1,32 0,5733 Using trolleys without mass piece/Gebruik van trollies sonder massastukke: 5. Vi(system/sisteem) = 0 m s -1 OR/OF ViA= 0 m s -1 ViB= 0 m s -1 (1) 6.1 Δx VA=  Δt =  = 0,445 m s -1  (3) 6.2 Δx VB= t =  = - 0,431 m s -1 / 0,43 m s -1in the opposite direction/in die teenoorgestelde rigting (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Technical Sciences/Tegniese Wetenskappe 5 DBE/PAT 2021 NSC/NSS – Marking Guidelines/Nasienriglyne 7.1 p = mv = ( 0,546 + 0,550 ) ( 0 ) = 0 kg m s -1 (3) 7.2 ∑p = mA vA + mBvB  = ( 0,546 )(0,445 ) + ( 0,550 ) (-0,431) = (0,243)+ (-0,237) = - 0,006 kg m s -1/ 0,006 kg m s -1in the original direction of trolley A/in die oorspronklike rigting van trollie A (4) The use of ONE trolley with a (250 g) mass piece./Die gebruik van EEN trollie met 'n (250 g) massastuk: 8.1 Δx VA= Δt 0,6267 = 1,320  -1 = 0,47 m s  (2) 8.2 Δx VB= t 0,573 =-  1,320 = - 0,43 m s -1/ 0,43m s -1in the opposite direction/in die teenoorgestelde rigting (2) 9.1 p = mv = ( 0,546 + 0,757 ) ( 0 ) = 0 kg m s -1 (3) 9.2 ∑p = mA vA + mBvB  = ( 0,546 )( 0,47 ) + ( 0,757 ) ( - 0,43 ) = ( 0,257 )+ ( - 0,326 ) = - 0,069 kg m s -1/ 0,069 kg m s-1 in the original direction of trolley A/in die oorspronklike rigting van trollie A (4) 10. No/Nee  (1) 11. The system was not perfectly frictionless.  Faulty release buttons. Time that the trolley hit the barriers were slightly different Stopwatch handling skills were not accurate./ Die stelsel was nie heeltemal wrywingloos nie.  Foutiewe vrylatingsknoppies. Die tyd wat die trollie die versperrings getref het, was effens anders. Die hantering van stophorlosies was nie akkuraat nie. (ANY ONE/ENIGE EEN) (1) [45] Copyright reserved/Kopiereg voorbehou