Physical Sciences Grade 12 P1 Mpumalanga November 2017 QP

Downloaded from hlayiso.com education MPUMALANGA PROVINCE REPUBLIC OF SOUTH AFRICA NATIONAL SENIOR CERTIFICATE MARKS: 150 TIME: 3 hours This paper consists of 16 pages, a graph paper and 3 data sheets. Please turn over Copyright reserved: eee

Downloaded from hlayiso.com Physical Sciences/P1 MDE/September 2017 2 NSC INSTRUCTIONS AND INFORMATION 1. Write your name on the ANSWER BOOK. 2. This question paper consists of ELEVEN 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. Leave ONE line open between two subquestions, for example between QUESTION 2.1 and QUESTION 2.2. ; 6. You may use a non-programmable calculator. 7. You may use appropriate mathematical instruments. 8. You are advised to use the attached DATA SHEETS. 9. Show ALL formulae and substitutions in ALL calculations. 10. Round off your final numerical answers to a minimum of TWO decimal places. 41. Give brief motivations, discussions et cetera where required. 12. Write neatly and legibly. Copyright reserved Please turn over

Physical Sciences/P1 Downloaded from hlayiso.com 3 MDE/September 2017 NSC QUESTION 1: MULTIPLE-CHOICE QUESTIONS Four options. are provided as possible answers to the following questions. Each question has only ONE correct answer. Write only the letter (A - D) next to the question number (1.1 - 1.10) in your ANSWER BOOK, for example 1.11 E. 14 1.2 Which one of the following physical quantities is equal to the product of the mass and the velocity of an object? A Power B Momentum Cc Netforce D Impulse (2) Two spheres, X with a mass of 4 kg and Y with a mass of 2 kg, are released simultaneously from the same height h. Each one of the spheres experiences an acceleration to the Earth due to a force. | Earth Which ONE of the following is the CORRECT relationship of the force actingon — each sphere and the acceleration of each sphere? FORCE (F) ACCELERATION (a) A Fy > Fy ay = ay B Fy = Fy ay = ay c Fx = Fy ay > ay D Fy, > Fy ay > ay (2) Copyright reserved : Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 MDE/September 2017 4 NSC 1.3. _ A learner applies a constant force F on a trolley of mass m resting on a hofizontal, frictionless surface. A wooden block with the SAME mass m is placed on the trolley. The trolley-block system moves to the right with an acceleration a. i i i | t a: m m The wooden block is now removed while the learner still applies the SAME FORCE F. The magnitude of the acceleration of the trolley without the wooden block is: A Yaa B a C 2a D 4a . : (2) 1.4 An object on the surface of the Earth experiences a gravitational force F. Planet Q@ has a mass AND radius half that of the Earth. Which ONE of the following is the gravitational force experienced by the object on the surface of planet Q? AF BOF c 2F D 4F . (2) 1.5 Light from distant solar systems undergoes a red shift. This phenomenon takes place because the... A frequency of light from distant solar systems is low. B distance that the light must travel causes the frequency to decrease. Cc distant solar systems are moving towards the Earth. light energy from distant solar systems that move away from the earth is directly proportional to the frequency. (2) Copyright reserved : Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 NaC MDE/September 2017 : Ss . 1.6 The electric field pattern between two charges Q, and Qz is shown below. Which ONE of the following statements regarding the charge Q; and Q: is CORRECT? Charge Q Charge Q2 A Negative Negative B Positive Negative Cc Negative Positive D Positive Positive (2) 1.7 A battery with an emf of 14 V and a negligible internal resistance is connected in a circuit to three resistors as shown in the diagram below. The resistance of the resistor Y is R. The-two voltmeters show readings of 6 V and 10 V respectively. Ignore the resistance of the connecting wires. 14V |i] Which ONE of the following is the CORRECT value of the resistance of resistor {x X? A . #R B R | Cc 2R D 4a (2) Copyright reserved Please turn over \

Downloaded from hlayiso.com Physical Sciences/P1 1.8. Arectangular current carrying coil, with the coil parallel to the field Q, ° u Y H | 6 NSC MDE/September 2017 PRS, is placed between two bar- magnets as shown below. The arrows indicate the direction of the conventional current. 1 ‘ ' 1 roAawvod The coil will... A first rotate clockwise and then anticlockwise. B rotate clockwise. Cc remain motionless. D rotate anticlockwise. 1.9. A bulb and two identical resistors The cell: has an emf € and an intem is P. Switch S is OPEN. are connected in the circuit as shown below. Switch § is now CLOSED. Which ONE of the follo reading and the power 0 wing state f the bulb is CORRECT? al resistance r. The power rating of the bulb ments regarding the change in the voltmeter VOLTMETER READING POWER IN BULB A Increases Decreases B Remains the same Remains the same c Decreases Increases D Decreases Decreases Copyright reserved Please turn over (2) (2)

Downloaded from hlayiso.com Physical Sciences/P1 7 MDE/September 2017 NSC 1.10 . Violet light with variable intensity is shone on a metal plate. Photoelectrons are ejected from the surface of the metal plate. Which ONE of the following graphs shows the correct relationship between the maximum kinetic energy of the ejected photoelectrons and the intensity of the incident light? » : = A fA B ui i Le So Intensity Intensity : g g — £ c ui D ui Intensity Intensity (2) [20] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 MDE/September 2017 8 NSC QUESTION 2 (Start on a new page) ; A5kg block and a3 kg block are connected by a light, inextensible string T;. A second light, inextensible string Tz is connected to the 5 kg block, The blocks are at rest as shown in.the diagram below. Ignore all effects of air resistance. Ta di tT | vy, 3kg | 2.1 State Newton's First Law of Motion in words. (2) 2.2 Draw a labelled free-body diagram showing ALL the forces acting on the 5 kg block. ; (3) 2.3 In which string is the tension greater? Choose from Ty or Ta. : (1) When the force in string Tz is 120 N, the blocks accelerate upwards. The string T1 can experience a maximum tension of 50.N before it breaks. 2.4 Determine by means of a calculation if the string T; will break. (6) When string Tz is removed, the blocks fall to the ground. Ignore all effects of air resistance. 2.5 How will the distance d between the blocks change during the motion? Write down only INCREASES, DECREASES or REMAINS THE SAME. (1) [13] Copyright reserved » Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 9 ; MDE/September 2017 . NSC QUESTION 3 (Start on a new page) Acar, 0,6 m high, is parked next to a block of flats. A learner leans over the edge of the roof of the building, 21 m above the roof of the car. The learner throws a ball, with a mass of 500 g, vertically upwards. The ball moves upwards to point X, falls back past the top of the building and hits the roof of the car after 2,88 s. Ignore all effects of air resistance. : 21m A 3.1 Define the term free fall. ; (2) 3.2 Write down the following experienced by the ball at point X: , 3.2.1 Magnitude of the net force : (1) 3.2.2 Direction of the acceleration . (1) ; 3.3. Calculate the: 3.3.1. Magnitude of the velocity with which the ball was thrown upwards (4) 3.3.2 Maximum height that the balll will reach above the ground (4) 3.4 The ball hits the roof of the parked car and bounces from the roof with a speed of 18 m:s'. The ball is in contact with the roof of the car for 0,1 s. Calculate the magnitude of the force that the roof of the car exerts on the ball. (5) [17] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 10 MDE/September 2017 NSC . QUESTION 4 (Start‘on a new page) A wooden sphere of mass 5 kg hangs stationary from a light string. A bullet of mass 50 g moves horizontally with a constant speed v and hits the wooden sphere. The bullet enters the wooden sphere and the sphere-bullet system swings further to a maximum height at point S as shown in the diagram below. | ED a TLE: | v —_—- —_ 50g 41 Define the term. gravitational potential energy. ° _. (2) 4.2 Calculate the: 4.2.1. Gravitational potential energy of the sphere-bullet system at point S (3) 4.2.2 Speed of the sphere-bullet system at point R ; (4) 4.2.3 Speed v of the bullet before it hits the sphere (4) . {13] Copyright reserved : ; Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 WW MDE/September 2017 NSC ; QUESTION 5 (Start on a new page) A trolley of mass 76 kg moves from rest from point W on a straight slope WXYZ. The trolley reaches point X with a speed of 3 ms, The part WXY of the slope is frictionless and YZ is a rough surface. . 5.1 Define the term normal force. 5.2 Draw a labelled free-body diagram to show ALL the forces acting on the trolley while it is moving from point X to point Y. 5.3 Calculate the speed of the troliey at point Y. The coetticient of kinetic friction (jx) between the trolley and the surface of the slope YZ is 0,21. The trolley comes to rest at point Z. 5.4 Calculate the magnitude. of the kinetic frictional force on the trolley while it moves from point Y to point Z. 5.5 Explain why NO work is done by the normal force on the trolley. 5.6 Use ENERGY PRINCIPLES only to calculate the height h. A block of 5 kg is added onto the trolley and the trolley-block system moves again from rest from point W. , 5.7 How will the speed of the trolley-block system at point Y compare to the speed of the TROLLEY ONLY, as calculated in QUESTION 5.3? Write down only INCREASES, DECREASES or REMAINS THE SAME. Copyright reserved Please tum over (2) (2) (4) (3) (1) (6) (1) [19]

Downloaded from hlayiso.com Physical Sciences/P1 12 f MDE/September 2017 | . NSC . QUESTION 6 (Start on a new page) A sound source emits sound waves with a frequency of 945 Hz. The sound source | moves towards a stationary listener at a constant velocity. The listener measures the | frequency of the sound waves as 980,6 Hz. Take the speed of sound in air as 340 ms" 1. Ignore the effects of wind. : 6.1 Define the term frequency. (2) 6.2 Explain why the listener observes a higher frequency than the frequency of the sound source. (2) 6.3 Calculate the speed of the sound source. (4) 6.4 Draw a graph of the observed frequency versus time as the sound source moves towards the listener, passing it and then moves away from the listener. Clearly indicate the frequency of the sound source (945 Hz) on the graph. (3) (11] QUESTION 7 (Start on a new page) An uncharged metal sphere M is suspended from the ceiling by means of a light, inextensible isolated string. The metal sphere is brought into contact with an identical isolated sphere N with a charge of +20 pC that is mounted on a stand. After contact sphere M experiences a repulsive force resulting in the string making an angle of 7° with the vertical as shown in the diagram below. 7A State Coulomb’s law in words. (2) 7.2 Calculate the magnitude of the charge on each of the metal spheres M and N after contact. (2) 7.3 Write down TWO conservative forces acting on the meta! sphere M.- (2) 74 Calculate the: 7.4.1 Magnitude of the electrostatic force between the spheres AFTER (4) CONTACT 7.4.2. Mass of the metal sphere M (3) [13] Copyright reserved : Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 13 MDE/September 2017 | NSC | QUESTION 8 (Start on a new page): Three resistors anda 64 W electrical apparatus are connected to a battery with an emf of 56 V and an internal resistance r as shown in the diagram below. The ammeter A; has a reading of 2 A. ——(Ar) ay - 250 2A 20 120 (e)_ (Ss) 1 u a o < 64 W (a2)— Electrical apparatus 8.1. State Ohm’s law in words. . (2) 8.2 How does the reading on ammeter A; compare to the reading on ammeter Ay? Choose from LARGER THAN, SMALLER THAN or THE SAME AS. Explain the answer : (2) 8.3 Calculate the: 8.3.1 Resistance of the electrical apparatus (3) 8.3.2 Current passing through the battery : (4) 8.3.3. Voltmeter reading V; (5) 8.4 The electrical apparatus is removed and replaced by another electrical appliance. The ammeter reading on A; changes to 0 A. Which electrical apparatus is connected in the circuit? : Write down only RESISTOR, VOLTMETER or CELL. Explain the answer. (2) [18] Copyright reserved Please tum over

Downloaded from hlayiso.com | 14 : Physical Sciences/P1 MDE/September 2017 NSC i QUESTION 9 (Start on a new page) A group of learners conduct an experiment to determine the internal resistance (r) of a battery. They set up the circuit as Shown in the diagram below. The following results were obtained when switch S was closed. Reading on voltmeter (V) 9 72 5,4 2,2 Reading on ammeter (A) 0,06 0,17 0,3 0,47 9.1 Explain the term internal resistance. . (1) 9.2 Use the above results to draw a graph of the potential difference versus current ON THE ATTACHED GRAPH SHEET. (3) 9.3 Use the graph drawn in QUESTION 9.2 to determine the following: 9.3.1 The emf of the battery (1) 9.3.2 The gradient of the graph (2) 9.3.3 The internal resistance of the battery (1) [8] Copyright reserved Please turn over

Physical Sciences/P1 Ne MDE/September 2017 ‘C QUESTION 10 (Start on a new page) A simplified sketch of a DC motor is shown in the diagram below. Commutator <7. on : oe : Carbon brushes 40.1 Name the component that ensures continuous rotation of the coil in this electric motor. - — (A) 40.2. Which structural change must be done to the components of the DC motor to change it into an AC motor? (1) An AC generator (alternator) delivers a peak current of 6,43 A when it is connected to an electrical heater with a resistance of 48,40. 10.3 Calculate the: 40.3.1 rms current delivered by the generator (3) 10.3.2 Peak voltage supplied by the generator : (5) [10] Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences/P1 16 MDE/September 2017 NSC QUESTION 11 (Start on a new page) The apparatus used to demonstrate the photoelectric effect is shown below. When a specific monochromatic light is shone on the metal plate, the ammeter shows a reading. De => 2, ° potential ° (A) difference 11.1. Define the term photo-electric effect. (2) A photon in the monochromatic light has a wavelength of 260 nm. When this incident light shines on the metal plate, electrons are ejected from the metal plate with a maximum speed of 5 x 10° m-s". 11.2. Calculate the: 44.2.1 Energy of a photon of the incident light (3) 11.2.2 Threshold frequency of the metal plate (3) [8] TOTAL: 150 Copyright reserved Please turn over

Downloaded from hlayiso.com ™ Physical Sciences/P1 17 MDE/September 2017 - ; NSC NAME: _ \ QUESTION 9 © GRAPH OF POTENSIAL DIFFERENCE VERSUS CURRENT 7. 0 Le aoe sts stebcka 8 6 | 4 Fs pel . iam wacaa it 2 = 7 0 1 0,2 0,3 0,4 0,5 0,6 > 0, ¥ ) a £) z J (A) Copyright reserved Please turn over

Downloaded from hlayiso.com. Physical Sciences/P1 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 VALUE / WAARDE Radius van die Aarde ~ NAME / NAAM SYMBOL / SIMBOOL Masea ei the Aarde M 5,98 x 107" kg Radius of Earth Re 6,38 x 10°m Copyright reserved

Downloaded from hlayi Physical Sciences/P1 NSC TABLE 2: FORMULAE / TABEL 2: FORMULES MOTION / BEWEGING Ve = vj + aAt Ax=vjAt+ dadt® orfof Ay = vAt+ daar =v) + 2aAx orlof v7 =v? + 2aAy x= (1% a oof Ay = -(U Sa FORCE / KRAG Fi. =ma p=mv a = UsN fk = WKN m= vom i =mv, — ie a petit orlof F=G d : M g=G— orlof g°S5 WORK, ENERGY AND POWER / ARBEID, ENERGIE EN DRYWING W =F Ax cos@ U=mgh or/ of E, =mgh 1 . Whaet = AK or/of Whet = AEx K== mv? oof == 5 mv? 2 2 AK = Ki = Ki orlof AE, = Et ~ Ex Whe = AK.+ AU orlof Wace = AEK + AE, | P= w Pave = F-Vave / Pygemia = F-Vgemid WAVES, SOUND AND LIGHT / GOLWE, KLANK EN LIG 1 v=faA =F . Vtv, a7 : _ .¢ {= viv, f, E=hf — orlof E=hy E=Wo+Exmax) or/of E=Wo + Kmax where/waar E=hf and/en Wo=hfo and/en. Eximax) = MVAax 1 orlof Kmax = 5MVinax Copyright reserved

Downloaded from hlayiso.com Physical Sciences/P1 ELECTROSTATICS / ELEKTROSTATIKA NSC _ kQiQe _ ka Fay E= r2 y- p=F q q nee or fof n= 2 e e ELECTRIC CIRCUITS / ELEKTRIESE STROOMBANE emf (€) =1(R +4) Vv Reo emk (€)=1(R+1) R, = Ri + Ro + jt, t, q=IAt R, R, A, W=Vq p-™ W=VIAt At W=PRAt P=VI ven P=?R Wee ve —R ALTERNATING CURRENT / WISSELSTROOM ms [o wok ~ [a V, V, Vins = — max I Vw = maks 2 V2 Pave =Vi, Tins / Pyemiadela= Vi it ms wk" wok Pave =T;,38 / Paemiddeld =TigR v2 Ve Pave = / Pyenists =F Copyright reserved