Technical Sciences Grade 12 Paper 1 EC June 2022 Memo

Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE/ NASIONALE SENIOR SERTIFIKAAT GRADE/GRAAD 12 JUNE/JUNIE 2022 TECHNICAL SCIENCES P1/ TEGNIESE WETENSKAPPE V1 MARKING GUIDE/NASIENRIGLYN MARKS/PUNTE: 150 This marking guide consists of 9 pages./ Hierdie nasienriglyn bestaan uit 9 bladsye.

Downloaded from hlayiso.com 2 TECHNICAL SCIENCES P1/TEGNIESE WETENSKAPPE V1 (EC/JUNE 2022) QUESTION/VRAAG 1 1.1 C  (2)  1.2 B  (2)  1.3 B  (2)  1.4 A  (2)  1.5 A  (2)  1.6 A  (2)  1.7 D  (2)  1.8 B  (2)  1.9 A  (2)  1.10 D  (2)  [20]  QUESTION/VRAAG 2 2.1 A body will remain in rest or continue moving with a constant velocity unless it is acted upon by a nett force.  ʼn Liggaam sal in rus bly of aanhou beweeg met ʼn konstante snelheid tensy ʼn netto krag daarop inwerk.  (2) 2.2 The girl has to overcome inertia. / Die meisie moet eers traagheid oorkom.  OR/OF μs > μk  OR/OF Fs > Fk  (2) 2.3 Ff = F cos θ  = 100 cos 42˚  = 74,31 N  (3) 2.4 2.4.1 Decrease / Afneem  (1) 2.4.2 Decrease / Afneem  (1) 2.5 Ff ∝ N  OR/OF Normal force decreases / Normaalkrag neem af  (2) [11] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/JUNE 2022) TECHNICAL SCIENCES P1/TEGNIESE WETENSKAPPE V1 3 QUESTION/VRAAG 3 3.1 3.1.1 acceleration / versnelling  3.1.2 directly proportional / direk eweredig  (2) 3.2 FN / N  Fboy/Fseun  Ff  Fgirl/Fmeisie  Fg / W  (5) 3.3 3.3.1 Fv = F sin θ  = 100 sin 30˚  = 86,6 N  (3) 3.3.2 POSITIVE MARKING FROM QUESTION 3.3.1 POSITIEWE NASIEN VAN VRAAG 3.3.1 Ff = μk FN  = 0,15 x 86,6  = 12,99 N  (3) 3.3.3 FH= F cos θ  = 100 cos 30˚  = 50 N  (3) 3.4 POSITIVE MARKING FROM QUESTION 3.3.2 and 3.3.3 POSITIEWE NASIEN VAN VRAAG 3.3.2 en 3.3.3 Fnett = ma Any One / Enige een F – FH – Ff = ma  F – 50 – 12,99 = 4(2)  ∴ F = 70,99 N  (4) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com 4 TECHNICAL SCIENCES P1/TEGNIESE WETENSKAPPE V1 (EC/JUNE 2022) QUESTION/VRAAG 4 4.1 No net external forces act on the system / (2 or 0).  Geen netto eksterne kragte word op die sisteem uitgeoefen nie / (2 of 0).  (2) 4.2 INELASTIC  Energy is lost (as sound and heat) OR Kinetic energy is not conserved  ONELASTIES  Energie gaan verlore (as hitte en klank) OF Kinetiese energie bly nie behoue nie.  (2) 4.3 Ek = ½mv2  1,216 x 105 = ½ (2 x 103 + 1800)v2  vafter / vna = 8 m.s-1 Σ pafter = (m1 + m2).vafter 𝛴 pna = (m1 + m2).vna = (2 x 10 + 1800) x 8  3 = 30 400 kg.m.s-1 Σ pbefore = Σ pafter 𝛴 pvoor = 𝛴 pna m1 vbefore = 30 400 (2 x 103).vbefore = 30 400  ∴ vbefore/vna = 15,2 m.s-1  (7) 4.4 The total (linear) momentum of an isolated system remains constant (in both magnitude and direction).  Die totale (lineêre) momentum van ʼn geïsoleerde sisteem bly konstant (in grootte en rigting).  (2) 4.5 Fnett.Δt = mvf – mvi  Fnett (0,1)  = (2 x 10-3)(8 – 15,2)  ∴ Fnett = 14 400 N to the left / na links  (4) 4.6 Crumple zones increases the time of contact (Δt).  The longer the time of contact the higher the nett force  for the same change in momentum. Die frommelsones vermeerder die kontaktyd (Δt). / Hoe langer die kontaktyd hoe hoër die netto krag  vir dieselfde veranderiing in momentum.  (3) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/JUNE 2022) TECHNICAL SCIENCES P1/TEGNIESE WETENSKAPPE V1 5 QUESTION/VRAAG 5 5.1 5.1.1 W = F.Δx cos θ  = (50)(3,2) cos 0˚  = 160 J  (3) 5.1.2 POSITIVE MARKING FROM QUESTION 5.1.1 POSITIEWE NASIEN VAN VRAAG 5.1.1 Wf = Ff.Δx cos θ  = (2)(3,2) cos 180˚  = -6,4 J Wnett = 160 + (-6,4)  = 153,6 J  (4) 5.1.3 P = Fv  = 50 x 2  = 100 W 100 P = 74,6  = 1,34 hp  (4) 5.2.1 Energy of a body due to its position above the ground.  Energie wat ʼn liggaam het as gevolg van sy posisie bokant die grond.  (2) 5.2.2 Total mechanical energy of an isolated system remains constant.  Totale meganiese energie van ʼn geïsoleerde sisteem bly konstant.  (2) 5.2.3 Ep = mgh  = (0,5)(9,8)(15)  = 73,5 J  (3) 5.3 Ek at X / Ek by X Ek = ½mv2 = ½(0,5)(142)  = 49 J  EmechX = 2 x 49  = 98 J  (4) [22] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com 6 TECHNICAL SCIENCES P1/TEGNIESE WETENSKAPPE V1 (EC/JUNE 2022) QUESTION/VRAAG 6 6.1 Deforming force: A force that changes the shape and size of a body.  Restoring force: A force that develops in a body and tries to bring a body back to its original shape and size.  Vervorminskrag: Die krag wat die vorm en grootte van ʼn liggaam verander.  Herstelkrag: ʼn Krag wat binne in ʼn liggaam ontwikkel en probeer om die liggaam na sy oorspronklike vorm en grootte terug te bring.  (4) 6.2 6.2.1 Strain is the ratio of change in dimension to the original dimension of an object.  Rekking is die verhouding tussen die verandering in dimensie en die oorspronklike dimensie van die voorwerp.  (2) 6.2.2 𝐹 𝜎=𝐴  𝐹 = 𝜋𝑟2 1925,5 = 𝜋(80 𝑥 10−3)/2)2  1925,5 = 5,027 𝑥 10−3 = 382 932, 17 Pa  (3) 𝜎 6.2.3 K=𝜀 382 932,17 190 x 109 =  𝜀 ∴ 𝜀 = 2,01 x 10-6 Any one / Enige een  𝛥𝑙 𝜀 =𝐿 2,01 x 10-6 = Δl L = Δl  (250 x 10-3) ∴ 𝛥𝑙 = 5,025 x 10-7 m  (5) 6.3 6.3.1 Hooke’s Law / Hooke se wet  (1) 6.3.2 Modulus of elasticity / Elastisiteitsmodulus  (1) 6.3.3 Elastic limit reached at point P / Elastisiteitsgrens by punt P bereik.  (2) 6.4 6.4.1 In a continuous fluid of equilibrium, the pressure applied at any point is transmitted equally to other parts of the liquid.  In ʼn deurlopende vloeistof in ewewig, sal die druk wat by enige punt toegepas word, eweredig na die ander dele van die vloeistof versprei word.  (2) 6.4.2 105 or/of 10 000 Pa (1) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/JUNE 2022) TECHNICAL SCIENCES P1/TEGNIESE WETENSKAPPE V1 7 6.4.3 𝐹1 𝐹2 = 𝐴2  𝐴1 𝐹1 2000 𝑥 9,8 =  0,03 0,4 ∴ F1 = 1470 N  (3) 6.5 Liquid pressure increases as the depth increases.  Vloeistof druk neem toe soos die diepte toeneem.  (2) 6.6 As the temperature increases, the viscosity decreases. OR As the temperature decreases, the viscosity increases. Any one OR Temperature is inversely proportional to viscosity.  Soos die temperatuur toeneem, neem die viskositeit af. Enige OF Soos die temperatuur afneem, neem die viskositeit toe. een OF Die temperatuur is omgekeerd eweredig aan viskositeit.  (2) [28] QUESTION/VRAAG 7 7.1 The angle of incidence equals the angle of reflection.  Die invalshoek is gelyk aan die weerkaatsingshoek.  (2) 7.2 Upright / Virtual / Same distance from the mirror as the object / Same size as the object.  Regop / Virtueel / Dieselfde afstand vanaf die spieël as die voorwerp / Dieselfde grootte as die voorwerp.  (2) 7.3 7.3.1 Bending of light as it moves from one medium to another where its speed is different. OR Bending of light when it passes from one medium to another of different optical density.  Buiging van lig soos dit beweeg van een medium na ʼn ander, waar die spoed verskillend is. OF Buiging van lig soos dit van een medium na ʼn ander met verskillende optiese digtheid beweeg.  (2) 7.3.2 Critical angle / Grenshoek  (1) 7.3.3 Glass / Glas  (1) 7.3.4 3 The angle of incidence is greater than the critical angle.  Die invalshoek is groter as die grenshoek.  (2) 7.3.5 Any 2 answers / Enige 2 antwoorde: Binoculars / Periscopes / Optical fibres OR Any relevant answer.  Verkykers / Periskope / Optiese vesels OF Enige relevante antwoord.  (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com 8 TECHNICAL SCIENCES P1/TEGNIESE WETENSKAPPE V1 (EC/JUNE 2022) 7.4 7.4.1 2F F F 2F 50 mm 75 mm 25 mm Marking guidelines: Nasienriglyne:  F and 2F both sides of lens  F en 2F albei kante van die  Object correct height (15 mm) lens and 50 mm from lens  Voorwerp korrekte hoogte  Lines drawn parallel and (15 mm) en 50 mm vanaf through optical centre. die lens.  Height of image (25 mm)  Lyne parallel en deur die  Distance of image from optical optiese middelpunt. centre (75 mm)  Hoogte van beeld (25 mm)  Afstand van beeld vanaf die optiese middelpunt (75 mm) (5) 7.4.2 Real / Reëel  (1) [18] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com (EC/JUNE 2022) TECHNICAL SCIENCES P1/TEGNIESE WETENSKAPPE V1 9 QUESTION/VRAAG 8 8.1 Dispersion / Dispersie  (1) 8.2 8.2.1 Indigo  (1) 8.2.2 Ultra-violet (UV)  (1) 8.3 X-rays / X-strale Q P ( or 0) (2) 8.4 8.4.1 A photon is a packet of energy of light OR A photon is a quantum of energie  ʼn Foton is ʼn pakkie ligenergie OF ʼn Foton is ʼn kwantum energie.  (2) 8.4.2 ℎ𝑐 E= 𝜆  (6,3 𝑥 10−34)(3 𝑥 108)  = (1 𝑥 10−8)  = 1,89 x 10-17 J  (4) [11] GRAND TOTAL / GROOTTOTAAL: 150 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief