Physical Sciences Grade 12 Paper 1 North West Mock 2022 Memo

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com NATIONAL SENIOR CERTIFICATE GRADE 12 PHYSICAL SCIENCES: PHYSICS (P1) SEPTEMBER 2022 MARKS: 150 TIME: 3 hours This question paper consists of 20 pages and 3 data sheets Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 2 com NW/September 2022 NSC INSTRUCTIONS AND INFORMATION 1. Write your name on the ANSWER BOOK. 2. This question paper consists of TEN questions. Answer ALL the questions in the ANSWER BOOK. 3 Start EACH question on a NEW page in the ANSWER BOOK. 4. Number the answers correctly according to the numbering system used in this question paper. 5. s. Leave ONE line open between sub questions, e.g. between QUESTION 2.1 and co QUESTION 2.2. m 6. You may use a non-programmable calculator. si c 7. st You may use appropriate mathematical instruments. an 8. m You are advised to use the attached DATA SHEETS. or 9. ep Show ALL formulae and substitutions in ALL calculations. 10. hy Round off your FINAL numerical answers to a minimum of TWO decimal places. 11. om Give brief motivations, discussions, etc. where required. 12. Write neatly and legibly. fr oa de d do wn l Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 3 com NW/September 2022 NSC QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are given as possible answers to the following questions. Each question has only one correct answer. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g.1.11 E. 1.1 Which ONE of the following is a conservative force? A Frictional force B An applied force C Gravitational force s.co D Tension in a rope m (2) si c 1.2 An object with mass m moves with a constant velocity. It undergoes a displacement st fx in t seconds in the presence of a frictional force F. How much power is required an to keep the body in motion at this constant velocity? A fx mor t ep B Fx hy 2 om C F( fx )2 t fr D fx oa (2) F( t ) de d do wn l Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 4 com NW/September 2022 NSC 1.3 Two forces, each of magnitude 300 N are simultaneously applied to a crate at rest on a frictionless horizontal surface as shown in the diagram below. Work will be done by the net force on the crate and the crate will... A accelerate to the left B be lifted off the surface C accelerate to the right D remain rest (2) 1.4 A stone falls freely from rest from a certain height. Which one of the following quantities could be represented on the y-axis of the graph? A Velocity B Acceleration C Momentum D Position (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 5 com NW/September 2022 NSC 1.5 The ball is released from rest at point A, h meters above the ground. It slides down and up on a smooth frictionless track ABC. See the diagram below. As the ball slides on the track ABC, it will … A have maximum kinetic energy and zero potential energy at B B roll up to a height of ‘z’ m on the opposite slope at C C lose mechanical energy as it rolls up the opposite slope towards point C D experience a gain in kinetic energy which is equal to its potential energy at C (2) 1.6 A source of sound moves away from a stationery observer. The frequency of the sound detected by the observer is different from the source frequency because: A the volume of the sound decrease as the source moves away from the observer B the speed of sound becomes smaller C the wave fronts received by the observer are further apart than the wave front from the source D the wave fronts received by the observer are closer than the wave front from the source (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 6 com NW/September 2022 NSC 1.7 Two oppositely charged spheres P and Q carry charges of +3 C and -3 C respectively. An object is placed at point Y as indicated in the diagram below. The vector diagram representing the net electric field at point Y is: (2) 1.8 The diagram below represents part of a circuit. The potential difference across P and Q is V Which ONE of the following gives the current through the 3 Ω resistor? V A 4 V B 6 V C 2 V D (2) 3 Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 7 com NW/September 2022 NSC 1.9 A multi plug enables us to plug many appliances in at the same time so they can function simultaneously. If a multi plug adaptor connected in parallel is overloaded with too many appliances, a trip switch cuts off the electrical supply. Which ONE of the following statements best explains the situation? A The effective resistance increases and the current becomes too high B More current is required that can be supplied C The effective resistance decreases, resulting in a larger current being drawn D The current is divided among all the appliances and is not enough for them all to operate (2) 1.10 Fluorescent lights are used for signage, advertising and coloured lighting. The fluorescent tubes consists of mainly argon, neon or krypton gas ... The type of spectrum formed by these types of lights is… A an absorption spectrum B a line emission spectrum C continuous spectrum D a transmission spectrum (2) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 8 com NW/September 2022 NSC QUESTION 2 (Start on a new page) Elephants are being transported from Kruger National Park to Eastern Cape. They are loaded into crates that are pulled up an inclined plane on frictionless rollers. The diagram below shows a crate with an elephant being held stationery on the ramp by means of a rope parallel to the ramp. The angle of inclination is 15 ̊ and the tension of the rope is 5000 N. 2.1 Draw a labelled free-body diagram of all the forces acting on the elephant and crate. (consider crate and elephant as one object) (3) 2.2 The crate has a mass of 800 kg. Determine the mass of the elephant. (4) 2.3 The crate is now being pulled up the ramp at CONSTANT ACCELERATION. 2.3.1 What effect does it have on the net force acting on the elephant and the crate? Choose from INCREASE, DECREASE OR REMAINS SAME. (1) 2.3.2 Explain your answer in QUESTION 2.3.1 (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 9 com NW/September 2022 NSC 2.4 In another experiment, learners investigated the forces acting on an object on an inclined plane. The object had a gravitational force of 98 N. The ratio of the NORMAL force to that of parallel component force was 7:4 2.4.1 Define normal force in words. (2) 2.4.2 Calculate the angle of inclination ø of the ramp (3) [14] Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 10 com NW/September 2022 NSC QUESTION 3 (Start on a new page) Nomsa is standing on the ground floor of a building. She throws a pencil case vertically towards Mekwe, who is standing on the balcony of the first floor of the building, with an initial velocity, v. Mekwe fails to catch the pencil case as it moves upwards but catches it on its way back. Ignore the effects of air friction. The position time graph below, not drawn to scale, represents the motion of the pencil case when it was thrown up till it reaches Mekwe’s hand. Choose upwards as positive. 3.1 Define the term free fall. (2) 3.2 Use the graph and determine the: 3.2.1 Time in which pencil case’s velocity is 0 m·s-1 (1) 3.2.2 Acceleration of the pencil case at 1,4 s? (2) 3.2.3 Time it takes for the pencil case to reach Mekwe’s hand from the moment Nomsa threw it upwards. (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 11 com NW/September 2022 NSC 3.3 Use equations of motion and information from the graph to calculate the: 3.3.1 Initial velocity v of the pencil case. (3) 3.3.2 Height of the pencil case above the ground when Mekwe caught it. (3) 3.4 Draw an acceleration-time graph for the entire motion of the pencil case. Indicate the value of acceleration and time on the graph. (2) 3.5 What does the area under the acceleration time graph represents? (1) [16] Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 12 com NW/September 2022 NSC QUESTION 4 (Start on a new page) Tim is playing snooker and positions his cue so that the white ball is lined up with the black ball. A 0,6 kg white ball moving at a velocity 0,5 m·s-1 collides with a stationery black ball of mass 0,8 kg. On contact, the black ball exerts a force of 1,2 N on the white ball. 4.1 State Newton’s Second Law of motion in terms of momentum. (2) 4.2 If the change in momentum of the white ball is -0,24 kg·m·s-1, calculate the time that the white ball is in contact with the black ball. (3) 4.3 Calculate the velocity of the white ball after the collision. (3) 4.4 On being struck, the black ball moves forward towards the bumper cushion on the sides of the snooker table and collided elastically with the bumper cushion. After collision, the kinetic energy of the black ball is 0,042 J. Calculate its velocity. (3) [11] Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 13 com NW/September 2022 NSC QUESTION 5 (Start on a new page) Vickey a 75 kg learner, jumps off a bridge 60 m above the ground. She has a bungee cord tied to her ankles. She falls 25 m before the bungee cord begins to stretch, slowing down her fall. The cord stretches 20 m, before the jumper come to rest. Ignore air friction. 5.1 Write down the work-energy theorem in words. (2) 5.2 Using energy principles calculate the kinetic energy of the jumper when she (4) has fallen 25 m. 5.3 Calculate the work done by the cord to bring her to rest. (3) 5.4 How much energy is transferred from the jumper to the cord? (1) 5.5 Calculate the average force exerted by the cord on the jumper if the cord stretches for 20 m before she comes to rest. (4) [14] Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 14 com NW/September 2022 NSC QUESTION 6 (Start on a new page) Scientists studying the social interaction of dolphins in captivity connected an underwater sound recorder to an oscilloscope and immersed it in the dolphin tank at an aquarium. They recorded the sound waves emitted by the dolphins as they approached the microphone. The waves they recorded on the oscilloscope are represented below: 6.1 State the Doppler effect in words. (2) 6.2 The average frequency of the social vocalisations of these dolphins is 38 kHz. Show by calculation that the frequency recorded is 2 kHz higher than the actual frequency. (2) 6.3 Explain why the recorded frequency is higher than the actual frequency. (2) 6.4 Calculate the speed at which the dolphins are approaching the recorder. The speed of sound in water is 1500 m·s-1. (5) 6.5 Astronomers have used Doppler effect to conclude that galaxies are moving away from the Earth. Write a reason to support their conclusion. (2) [13] Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 15 com NW/September 2022 NSC QUESTION 7 (Start on a new page) Two small identical metal spheres, X and Y, each with a mass of 0,9 g hang from the same fixed point from threads of equal length. When the spheres receive equal charges, they repel each other and come to rest with their centres 40 mm apart and the threads making an angle of 45 ̊ with the vertical. 7.1 State Coulomb’s law in words. (2) 7.2 Draw a force diagram to show all the forces acting on Y. (3) 7.3 Calculate the: 7.3.1 Magnitude and direction of electrostatic force that X exerts on Y. (3) 7.3.2 Charge on each sphere. (3) 7.4 Three charged particles A, B and C are arranged in a line as shown in the diagram. 7.4.1 Calculate the magnitude and direction of net electrostatic force on particle C due to the other two charges. (3) [14] Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 16 com NW/September 2022 NSC QUESTION 8 (Start on a new page) Three identical unknown resistors each of resistance R are connected in circuit to a battery of emf 24 V and unknown internal resistance ‘r’. An ammeter registers a current of 3 A and voltmeter V1 reads 21 V when the switch ‘S’ is closed. 8.1 Explain the term internal resistance. (2) 8.2 Write down a mathematical expression/formula which relates the voltmeter readings of V2 and V3. (1) 8.3 What will be the reading on V2 and V3? (2) 8.4 Calculate the: 8.4.1 Internal resistance of the battery. (4) 8.4.2 Resistance of the resistor R. (3) 8.5 A car lamp is marked ’12 V, 60 W’. Calculate the quantity of electric charge that passes through any point in the lamp in 2 minutes when operating according to the above mentioned specifications. (4) [16] Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 17 com NW/September 2022 NSC QUESTION 9 (Start on a new page) The diagram given below is a schematic representation of an AC generator. 9.1 Write down the: 9.1.1 Name of the part labelled ‘R’. (1) 9.1.2 Function of part labelled ‘R’. (2) 9.2 State ONE principle on which an AC generator works. (2) 9.3 If the armature is rotated in the direction as indicated in the diagram, which way will the current flow in the armature? Choose from A to B or B to A (1) 9.4 What effect does changing the polarity of the magnets have on the output voltage? Choose from INCREASES, DECREASES OR REMAINS THE SAME. (1) 9.5 What is the position of the coil, relative to the magnetic field, when the output voltage is at a minimum? (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 18 com NW/September 2022 NSC 9.6 The graph shows the potential delivered by an AC source to a light bulb which is dissipating 15 W. 9.6.1 What DC voltage would have to be supplied to keep the bulb burning at the same brightness? (3) 9.6.2 What is the peak current through the bulb while it is connected to the AC source? (4) 9.6.3 Draw a graph of current versus time for the same time period as the above graph. Indicate the values of Imax and Irms on the graph. (2) [19] Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 19 com NW/September 2022 NSC QUESTION 10 (Start on a new page) When ultraviolet light shines on the surface of an electrode of a photoelectric cell, electrons are ejected. The velocity of the ejected electrons is measured against the frequency. The graph below represents the results obtained. 10.1 Name the physical quantity represented by ‘f1’ on the graph? (1) 10.2 Use the information from the graph to calculate the value of f1 (5) 10.3 A grade 12 learner has a calculator that is powered by a photoelectric cell. The photoelectric cell consists of two conductive plates that are connected in a circuit as shown below. The lower plate consists of selenium. 10.3.1 Define the term work function in words. (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 20 com NW/September 2022 NSC A learner shone a blue light on the photoelectric cell and found that the calculator did not work. He finds that the calculator works in day light. Use the information given below and answer the questions that follow: Frequency of blue light Frequency of Work function of ultraviolet light selenium 3,32 X 1014 Hz 1,54 X 1016 Hz 9,44 X 10 -19 J 10.3.2 Calculate threshold frequency of selenium? (3) 10.3.3 Write a reason why does the photoelectric cell work in day light and not in blue light. (2) [13] TOTAL: 150 Copyright reserved

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/P1 1 com NW/September 2022 NSC DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 1 (FISIKA) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Acceleration due to gravity Swaartekragversnelling g 9,8 m·s-2 Universal gravitational constant Universele gravitasiekonstant G 6,67 x 10-11 N·m2·kg-2 Speed of light in a vacuum Spoed van lig in 'n vakuum c 3,0 x 108 m·s-1 Planck's constant Planck se konstante h 6,63 x 10-34 J·s Coulomb's constant Coulomb se konstante k 9,0 x 109 N·m2·C-2 Charge on electron Lading op elektron e 1,6 x 10-19 C Electron mass Elektronmassa me 9,11 x 10-31 kg Mass of the Earth Massa van die Aarde M 5,98 x 1024 kg Radius of the Earth Radius van die Aarde RE 6,38 x 106 m Copyright reserved

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. Physical Sciences/ P1 2 com NW/September 2022 NSC TABLE 2: FORMULAE/TABEL 2: FORMULES MOTION/BEWEGING v f  v i  a t Δx  v i Δt  21 at 2 or/of Δy  v i Δt  21 at 2  v vf   v  vf  v f  v i  2ax or/of v f  v i  2ay 2 2 2 2 Δx   i  Δt or/of Δy   i  Δt  2   2  FORCE/KRAG Fnet  ma p  mv   sN max fs fk   k N Fnet t  p w  mg p  mv f – mv i m 1m 2 m 1m 2 M M FG or/of FG g G or/of g G 2 d 2 r 2 d2 r WORK, ENERGY AND POWER/ARBEID, ENERGIE EN DRYWING W  Fx cos  U  mgh or/of E P  mgh Wnet  K or/of Wnet  E k 1 1 K  mv 2 or/of E k  mv 2 2 2 K  K f  K i or/of Ek  Ekf  Eki W W nc  K  U or/of Wnc  Ek  Ep P t Pave  Fv ave / Pgemid  Fv gemid WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG 1 vf T f v  vL v  vL c fL  fs fL  fb E  hf or/of E h v  vs v  vb  E  Wo  E k(max) or/of E  W o  K max where/waar 1 E  hf and/en W0  hf 0 and/en E k (max)  2 mv max or/of K max  1 mv max 2 2 2 Copyright reserved

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences/P1 3 NW/September 2022 NSC ELECTROSTATICS/ELEKTROSTATIKA kQ 1Q 2 kQ F E  r 2 r2 W F V E q q Q Q n or/of n e qe ELECTRIC CIRCUITS/ELEKTRIESE STROOMBANE emf ( ε )  I(R + r) V R emk ( ε )  I(R + r) I R s  R 1  R 2  ... 1 1 1 qI  t    ... R p R1 R 2 W  Vq W P Δt W  VI  t P  VI W  I2R  t P  I 2R V Δt 2 W  V2 R P R ALTERNATING CURRENT/WISSELSTROOM I I I rms  max / I wgk  maks Pave  Vrms I rms / Pgemiddeld  Vwgk I wgk 2 2 Vmax Pave  I rms 2 R / Pgemiddeld  I 2wgk R Vrms  / 2 2 2 Vrms Vwgk V wgk  Vmaks Pave  / Pgemiddeld  2 R R Copyright reserved

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com NATIONAL SENIOR CERTIFICATE/ NASIONALE SENIOR SERTIFIKAAT GRADE/GRAAD 12 PHYSICAL SCIENCES: PHYSICS (P1) FISIESE WETENSKAPPE: FISIKA (V1) SEPTEMBER 2022 MARKING GUIDELINES/NASIENRIGLYNE MARKS/ PUNTE: 150 These marking guidelines consist of 16 pages including the cognitive table/ Hierdie nasienriglyne bestaan uit 16 bladsye wat die kognitiewe tabel insluit. Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 2 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne QUESTION 1/VRAAG 1 1.1 C  (2) 1.2 D  (2) 1.3 A  (2) 1.4 D  (2) 1.5 B  (2) 1.6 C  (2) 1.7 D  (2) 1.8 A  (2) 1.9 C  (2) 1.10 B  (2) [20] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 3 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne QUESTION 2 /VRAAG 2 2.1 Accept the following symbols N FN/Normal/Normal force Normaal/Normaalkrag F FA/Applied force force/ 5000 N FA/Toegepaste krag/ 5000 N w OR Fg‖ and Fg┴ Fg/mg/weight/ gravitational force Fg/mg/gewig/ gravitasiekrag (3) 2.2 Fg‖ = w sinθ  5000 = w sin 15 o  w = 19318,52 N ME = (19318,52) – 800  9,8 = 1171,28 kg  (4) 2.3.1 Increases/Verhoog.  (1) 2.3.2 Crate is moving at constant acceleration/Die krat beweeg teen `n konstante versnelling (1) 2.4.1 The force or the component of a force which a surface exerts on an object with which it is in contact, and which is perpendicular to the surface. /Die krag of die komponent van die krag wat `n voorwerp op `n oppervlakte uitoefen waarmee dit in kontak is, en wat loodreg op die oppervlakte is.  (2 or/of 0) (2) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 4 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne 2.4.2 Fg‖ = w sinθ = (98) (sinθ) Fg┴ = w cosθ = (98) (cosθ) 7 Fg‖ = 4 Fg┴  7 (98) (sinθ) = 4 (98) (cosθ)  tanθ = 0,5714 θ = 25,53 o  Note: By using tanθ - 2/3 marks Nota: Gebruik van tanθ - 2/3 punte tan θ = 4  7 θ = 25,53 o  (3) [14] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 5 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne QUESTION 3/ VRAAG 3 3.1 Motion during which the only force acting on an object is the force of gravity. Beweging waar die enigste krag wat op die voorwerp inwerk gravitasiekrag is. (2 or/of 0) (2) 3.2.1 1,4 s  (1) 3.2.2 9,8 m·s-2  downwards / afwaarts  (2) 3.2.3 1,4 + 0,8 = 2,2 s  (2) 3.3.1 vf = vi + aΔt  0 = vi + (-9,8) (1,4)  vi = 13,72 m·s-1  (3) 3.3.2 POSITIVE MARKING FROM QUESTION 3.3.1 and 3.2.3/ POSITIEWE NASIEN VANAF 3.3.1 and 3.2.3 ∆y = vi∆t + ½ a∆t2  ∆y = (13,72)( 2,2) + ½ (-9,8 )( 2,22)  = 6,47 m  (3) 3.4 POSITIVE MARKING FROM QUESTION 3.2.3 POSITIEWE NASIEN VANAF 3.2.3 Marking Criteria  Labelling -9,8 and 2,2 on the graph   Shape and graph lies below x axis  Nasien kriteria  Toon -9,8 en 2,2 op die grafiek   Vorm van grafiek en grafiek lê onder die x-as  (2) 3.5 Change in the velocity  Verandering is die snelheid  (1) [16] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 6 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne QUESTION 4 / VRAAG 4 4.1 The net force acting on an object is equal to rate of change of momentum of the object Die netto krag wat op `n voorwerp inwerk is gelyk aan die verandering in die momentum van die voorwerp (2 or/of 0) (2) 4.2 Fnet ∆t = ∆P  (-1,2)(∆t) = (- 0,24)  ∆t = 0,2 s  (3) 4.3 OPTION 1 OPTION 2 Fnet ∆t = ∆P = m(vf – vi ) ∆P = m(vf – vi ) (-1,2) (0,2) = 0,6 (vf - 0,5)  (-0,24) = 0,6 (vf - 0,5)  vf = 0,1 m·s-1 towards east  vf = 0,1 m·s-1 towards east  (3) 4.4 Ekbefore = Ekafter any one / enige een Ek = ½ mv2 0,042 = ½ (0,8)(vf)2  vf = 0,32 m·s-1. (3) [11] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 7 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne QUESTION 5 / VRAAG 5 5.1 The net/total work done on an object is equal to the change in the object’s kinetic energy.  / Die netto werk verrig op `n voorwerp is gelyk aan sy verandering in kinetiese energie. OR The work done on an object by a resultant/net force is equal to the change in the objects kinetic energy.  / Die werk verrig op `n voorwerp deur `n netto/resultante krag is gelyk aan sy verandering in kinetiese energie. (2) 5.2 Wnc = ∆EK + ∆Ep any one / enige een Wnc = ( EKf - EKi ) + ( Epf – Epi ) 0  = (EKf – 0) + ( 0 – (75)(9,8)(25))  EKf = 18375 J  (4) 5.3 POSITIVE MARKING FROM QUESTION 5.2 POSITIEWE NASIEN VANAF 5.2 Wnc = ∆EK + ∆Ep Wnc = ( EKf - EKi ) + ( Epf – Epi ) = (0-18375) + (0 – (75)(9,8)(20)  = (- 18375) + (-14700) = - 33075 J  (3) 5.4 33075 J  (1) 5.5 POSITIVE MARKING FROM QUESTION 5.3 POSITIEWE NASIEN VANAF 5.3 Wnc = F∆x cosθ  - 33075  = FT x 20 cos180̊  FT = 1653,75 N  (4) [14] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 8 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne QUESTION 6 / VRAAG 6 6.1 The change in frequency (or pitch)  of the sound detected by a listener because the sound source and the listener have different velocities relative to the medium of sound propagation. / Die verandering in die frekwensie (toonhoogte) van die waargenome klank deur die luisteraar agv die klankbron en die luisteraar wat verskillende snelhede relatief tot mekaar het. OR/OF An (apparent) change in (observed/detected) frequency (pitch), as a result of the relative motion between a source and an observer  (listener). 'n (Skynbare) verandering in(waargenome) frekwensie  (toonhoogte), as gevolg van die relatiewe beweging tussen die bron en 'n waarnemer/luisteraar. (2) 6.2 OPTION 1 OPTION 2 f(recorded) = (4)  f(recorded) = (2)  -4 (1 x 10 ) (5 x 10-5) = 40000 Hz = 40000 Hz = 40 kHz = 40 kHz 40-38 = 2 kHz  40-38 = 2 kHz  (2) 6.3 When the dolphin is moving towards the recorder, there is a compression of the wave fronts, more waves are arriving per second.  Wanneer die dolfyn na die klankopnemer beweeg vind `n kompressie van golffronte plaas  en meer golwe arriveer per sekonde  (2) 6.4 OPTION 1 / OPSIE 1  40000 = (1500+0)  38000  (1500-vs) Vs = 71,43 m·s-1  (5) 6.5 The light coming from the distant planet observed from the Earth has a lower frequency and therefore a longer wavelength.  Therefore it is shifted towards the red end of the spectrum.  Die lig vanaf verafgeleë planete wat observeer word van die aarde het `n laer frekwensie en langer golflengte , daarom vind `n verskuiwing na die rooi gedeelte van die speltrum plaas  (2) [13] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 9 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne QUESTION 7 / VRAAG 7 7.1 The magnitude of the electrostatic force exerted by one point charge (Q 1) on another point charge (Q2) is directly proportional to the product of the magnitudes of their charges and inversely proportional to the square of the distance (r) between them  / Die grootte van die elektrostatiese krag wat deur een puntlading (Q1) op 'n ander puntlading (Q2) uitgeoefen word, is direk eweredig aan die produk van die groottes van die ladings  en omgekeerd eweredig aan die kwadraat van die afstand (r) tussen hulle  (2) 7.2 Accept the following symbols T Tension in the spring / Spanning in die tou F Electrostatic force of repulsion / Elektrostatiese afstotingskrag w Fg/mg/weight/Fearth on sphere/gravitational force Fg/mg/gewig/F aarde op sfeer/gravitasiekrag force (3) 7.3.1 Forces are in equilibrium / Kragte is in ewewig w = mg = (0,0009)(9,8)  = 0,0088 N tan 45 ̊ = (F )  (0,0088) =0,008 N repulsion to the right. / afstotend na regs (3) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 10 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne 7.3.2 POSITIVE MARKING FROM QUESTION 7.1.3 POSITIEWE NASIEN VANAF 7.1.3 kQ1Q 2 F=  r2 0,0088 = (9x 109) ( Q)2  (0,04)2 Q = 3,8 x 10-8 C  Accept the range 3,8 to 3,9 x 10-8 C Q = 3,8 x 10-8 C  Aanvaar omvang 3,8 tot 3,9 x 10-8 C (3) 7.4.1 kQ1Q 2 F= r2 ‘F’ at ‘C’ due to A FCA =( 9,0 x 109) (4 x 10-6 ) (8 x 10-6 )  0,52 = 1,152 N to the right / na regs ‘F’ at ‘C’ due to B FCB =( 9,0 x 109) (4 x 10-6 ) (3x 10-6 )  0,22 = 2,7 N to the left / na links Net electrostatic force at C =1,152 -2,7 = - 1,548 N· to the left  Netto elektrostatiesekrag by C =1,152 -2,7 = - 1,548 N· na links  (3) [14] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 11 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne QUESTION 8 / VRAAG 8 8.1 Internal resistance is the resistance found inside the battery due to the movement of charges.  Interne weerstand is die weestand in die battery as gevolg van die beweging van lading (2) 8.2 V2 = 2V3 OR V3 = ½ V2 (1) 8.3 V1 = V 2 + V 3 21 = V2 + ½ V2 V2 = 14 V  V3 = 7 V  (2) 8.4.1 Vlost = 24-21 =3V Vlost = Ir  3 = 3r  r =1 Ω  (4) 8.4.2 OPTION 1 OPTION 2 R= V  R= V  I I V2 = 14 V V3 = 7 V 14 = 3R  7 = 3RT R = 4,67 Ω  7 = (3)(R)  2 R = 4,67 Ω  (3) 8.5 P = VI 60 = 12 x I  I=5A Q = It  = 5x2x60  = 600 C  (4) [16] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 12 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne QUESTION 9 / VRAAG 9 9.1.1 Slip rings / Sleepringe (1) 9.1.2 Slip rings keep the armature in contact with the brushes, and thus ensure flow of current to the external circuit.  Sleepringe hou die spoel in kontak met die koolstofborsels en verseker die vloei van stroom na die eksterne stroombaan  (2) 9.2 Induction of an electromotive force by the motion of conductor across a magnetic field. OR Whenever there is a change in the magnetic flux linkage with a conductor an emf is induced.  Induksie van 'n elektromotoriese krag deur die beweging van 'n geleier oor 'n magnetiese veld. OF Wanneer daar `n verandering in die magnetiese vloedkoppeling is met `n geleier waarin `n emk dan geïnduseer word (2) 9.3 A to B / A na B (1) 9.4 Remains the same  Bly dieselfde  (1) 9.5 Coil will be parallel to the field / Spoel sal parallel aan die veld wees (2) 9.6.1 V max Vrms =  2 17 Vrms =  2 Vrms = 12,02 V  V max Vwgk = 2 17 Vwgk = 2 Vwgk = 12,02 V (3) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 13 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne 9.6.2 POSITIVE MARKING FROM POSITIEWE NASIEN VANAF QUESTION 9.2.1 VRAAG 9.2.1 Pave = Irms x Vrms  Pgem = Iwgk x Vwgk  15 = Irms x 12,02  15 = Iwgk x 12,02  Irms = 1,25 A Iwgk = 1,25 A I max I rms   I max 2 I rms   2 I max I max 1,25 =  1,25 =  2 2 Imaks = 1,77 A  Imax = 1,77 A  (5) 9.6.3 POSITIVE MARKING FROM QUESTION 9.2.2 POSITIEWE NASIEN VANAF VRAAG 9.2.2 Marking Criteria / Nasien kriteria  Labelling Imax on the graph / Imaks aangedui op die grafiek  Labelling Irms on the graph / Iwgk aangedui op die grafiek (2) [19] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

Downloaded from hlayiso.com Downloaded f rom St anmorephysics. com Physical Sciences P1/Fisiese Wetenskappe V1 14 NW/September 2022 NSC/NSS – Marking Guidelines/ Nasienrigliyne QUESTION 10 / VRAAG 10 10.1 Threshold frequency / Drumpelfrekwensie (1) 10.2 E = W o + Ek(max) any one / enige een  E = hfo + ½ mv2 (6,63 x 10-34) (5 x 1015) = (6,63 x 10-34)( fo) + (½ x 9,1 x 10-31)(5 x 105)2 f0 = 4,8 X 1015 Hz  (5) 10.3.1 The work function of a metal is the minimum energy that an electron needs to be emitted from the metal surface  Die werksfunksie van `n metaal is die minimum hoeveelheid energie benodig om elektrone uit die oppervlakte van die metaal vry te stel (2 or/of 0) (2) 10.3.2 Wo = hfo  9,44 X 10 -19 = (6,63 x 10-34)( fo)  fo = 1,42 X 1015 Hz  (3) 10.3.3 The frequency of blue light is less than that of threshold frequency of selenium,and the frequency of ultraviolet light (found in day light) is greater than threshold frequency of selenium. Die frekwensie van blou lig is laer as die drumpelfrekwensie van selenium,en die frekwensie van unltraviolet lig (wat in die dag gekry word) is groter as die drumpelfrekwensie van selenium. (2) [13] TOTAL/TOTAAL: 150 Copyright reserved/Kopiereg voorbehou

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