Physical Sciences Grade 12 P1 North West Mock 2025 QP

education Department: Education North West Provincial Government REPUBLIC OF SOUTH AFRICA NATIONAL SENIOR CERTIFICATE | GRADE 12 PHYSICAL SCIENCES: PHYSICS (P1) SEPTEMBER 2025 ee eee eee eee eee ee eee ees 2 ee fee ee 2 2 eo MARKS: 150 TIME: 3 hours This question paper consists of 15 pages and 3 data sheets. Copyright reserved Please turn over

NW/September 2025 INSTRUCTIONS AND INFORMATION ce Write your name on the ANSWER BOOK. & This question paper consists of 10 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 between two subquestions, e.g. between QUESTION 2.1 and QUESTION 2.2. 6. You may use a non-programmable calculator. Ts You may use appropriate mathematical instruments. 8. Show ALL formulae and substitutions in ALL calculations. 9. Round off your FINAL numerical answers to a minimum of TWO decimal places. 10. Give brief motivations, discussions, etc. where required. 11. You are advised to use the attached DATA SHEETS. 12, Write neatly and legibly. Copyright reserved Please turn over

NW/September 2025 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided 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. Aman pushes a wall with a constant force F but the wall does not move. Which of the following Newton’s laws of motion applies to this scenario? (i) (ii) (iti) A B Cc D First law Second law Third law (i) only (i) and (ii) only (i) and (iii) only (i), (ii) and Git) (2) 1.2 Acrate of mass m is sliding down a rough incline at a constant velocity. Ss 8 Which ONE of the following statements regarding the magnitude of the normal force acting on the crate is correct? The magnitude of the normal force acting on the crate is ... A equai to the component of the weight of the crate which is perpendicular to the slope. equal to the component of the weight of the crate which is parallel to the slope. greater than the component of the weight of the crate which is perpendicular to the slope. greater than the component of the weight of the crate which is parallel to the slope. (2) Copyright reserved Please turn over

NW/September 2025 1.3. The velocity-time graph below represents the bouncing movement of a bail. ignore the effects of air friction. s/ §} At (8) P ¥ = a E > st Which ONE of the following statements about the motion of the ball is INCORRECT? A The bail was dropped from a certain height. B The bail lost some of its kinetic energy to heat and sound each time it is in contact with the ground. c The bal! experiences a constant acceleration each time it is in the air. D. The ball reaches maximum height 4 times after it was dropped. (2) 4.4 The net force F acts on an object of mass m to produce a change in momentum of p per second. If the net force F is DOUBLED, the new change in momentum will be ... A B c D Ap 2 Ap 1 24P 4 Ap (2) 1.5 Ablock slides across a rough horizontal surface until it stops. Which ONE of the following statements regarding the movement of the biock is CORRECT? A B Cc D The net work done on the block is negative. The net force acting on the block is equal to ZERO. The change in kinetic energy of the block is positive. Mechanical energy during the motion of the block is conserved. (2) Copyright reserved Please turn over

1.6 An astronaut studies a star that is moving away from the earth. NW/September 2025 Which ONE of the following combinations of frequency and wavelength is CORRECT about the star? FREQUENCY WAVELENGTH 1A Increases Decreases iB Increases Increases |C Decreases Increases D Decreases Decreases (2) 1.7 The electric field strength from a charged sphere q is E at a point that is a distance r away from the sphere. The electric field strength will be ... at a point that is 3 r from the same charged sphere. A ig 3 B Ze bi Cc 3E D 9E (2) Copyright reserved Please turn over

NW/September 2025 1.8 In the circuit diagram below, the battery has negligible internal resistance. The resistance of the ammeter and the wires may also be ignored. iia} © © V2 bd “sa 1 (“) The reading on voltmeter V3 is equal to ... A Vix Vo B Vit V2 Cc 2M D ; M1 (2) 1.9 ADC motor has all these components except ... A a cell or battery. B carbon brushes. Cc split ring commutator. D slip rings commutator. (2) 4.10 The line absorption spectrum, in terms of the energy transitions of atoms, will be from ... A zero to high energy level. B high energy level to zero. Cc low to high energy level. D high to low energy level. (2) [20] Copyright reserved Please turn over

NW/September 2025 QUESTION 2 (Start on a new page.) Block A of mass 3 kg is connected to block B of mass 6 kg by a light inextensible string passing through a frictionless pulley. The 3 kg block lies on an incline that makes an angle of 30° with the horizontal. Block B is pulled by a constant force F to the left, as shown in the diagram below. The blocks have an acceleration of 2 m-s* to the left. Block B «FE Big 2.1 Define the term kinetic frictional force. (2) The kinetic frictional forces acting on blocks A and B are 4,3 N and 7,2 N respectively. 2.2 Draw a labelled free-body diagram showing ALL the forces acting on block A. (4) 2.3. Calculate the magnitude of: 2.3.1 The tension in the string (4) 2.3.2 Force F (3) 2.4 How will the acceleration of block B change if the string breaks? Choose from INCREASES, DECREASES or REMAINS THE SAME. (1) [14] Copyright reserved Please turn over

NW/September 2025 QUESTION 3 (Start on a new page.) Ball A is thrown vertically upwards from the top edge of a building which is 100 m high and reaches its maximum height after 1,5 seconds. Ball A strikes the ground at time t. An identical ball B is thrown vertically upwards from the same roof top when ball A is at maximum height. Both balls A and B strike the ground with the SAME VELOCITY. (4,5 $ later} Ball B Height = 100m Ignore the effects of air friction. 3.1. Explain what is meant by a projectile. (2) 3.2. Using EQUATIONS OF MOTION ONLY, caiculate the: 3.2.1. Maximum height reached by ball A above the ground (4) 3.2.2 Velocity at which bail B hits the ground (4) 3.2.3 Time it takes for both balls to hit the ground from the moment they were thrown (3) 3.3. Draw a labelled velocity versus time graphs, on the same set of axes for the motion of the two balls from the moment they were thrown until they strike the ground. Clearly indicate the following on the graphs: The velocities with which each bail was thrown The time at which bali B was thrown The velocities with which the balls strike the ground The time at which ball B strike the ground (5) [18] Copyright reserved Please turn over

NW/September 2025 QUESTION 4 (Start on a new page.) Ball A of mass m moving to the right with a speed of 12 m-s” collides with a stationary ball B of mass 3m. After collision, ball B moves to the right at 4,68 m-s7. Before collision After collision 12 m-s* 4,68 m-s? ——P _ee BailA Bali B BallA Ball B Ignore all frictional and rotational effects. 4.1 Calculate the velocity of ball A after the collision. 4.2 Prove, showing ALL calculations, that the collision of the two balls is INELASTIC. If the value of m is 0,05 kg and the balls are in contact with each other for 0,03 s during the collision. 4.3. Define the term impulse. 4.4 Determine the force that ball A exerts on ball B during the collision. Copyright reserved (4) (4) (2) (3) [13] Please turn over

NW/September 2025 QUESTION 5 (Start on a new page.) A 4 kg block slides down a slope. As it passes point A, which is 15 m above the ground, its velocity is 3 m-s~. It slides down a smooth slope AB. It then moves a distance of 18 m on a horizontal surface BC which applies a constant, non-conservative force, on the block until it stops at point C. B 18m >C 5.1. Name the non-conservative force acting on the block from point B to point C. (1) 5.2 Using ENERGY PRINCIPLES ONLY, calculate the: 5.2.1 Speed of the block at point B (3) 5.2.2 Magnitude of the non-conservative force acting on the block from point B to point C (4) 5.2.3 Coefficient of kinetic frictional force (3) [11] Copyright reserved Please turn over

NW/September 2025 QUESTION 6 (Start on a new page.) Musa is playing loud music from his car as he approaches Thabo who is standing on the sidewalk. Thabo has a wavelength detector which registers a wavelength of 350 mm coming from Musa’s car. Take the speed of sound in air to be 343 m-s*. Musa Thabo 6.1 State the Doppler effect in words. (2) 6.2 Calculate the: 6.2.1 Frequency of the detected wavelength by Thabo’s detector (3) 6.2.2 Wavelength of the sound produced by Musa’s car radio if the car is moving at a constant speed of 30 m-s* (5) 6.3 Information of a distant star from earth is recorded in a laboratory and the results are shown in the diagram below. RED Earih 6.3.1 Is the star moving TOWARDS or AWAY FROM the earth? Choose from TOWARDS or AWAY FROM. (1) 6.3.2 Explain the answer to QUESTION 6.3.1 (2) [13] Copyright reserved Please turn over

NW/September 2025 QUESTION 7 (Start on a new page.) In an atom, the proton, in the nucleus is 3 x 10°'? m away from an electron in the orbital, as shown in the diagram below. Proton (+) («) Electron (e1) t = distance between them 7.1 Draw the resultant electric field pattern that exists between the proton and the electron. (3) 7.2 State Coulomb’s Law in words. (2) 7.3 Calculate the electrostatic force beiween the proton and the electron. (3) The atom now gains an electron which is placed in such a way that the three particles make a right angle, as shown in the diagram below. The distance between electrons e1 and e2 is equal to the distance between the proton and electron e1. Assume that both electrons and the proton remain stationary at those positions. 74 Calculate the: 7.4.1 Net electrostatic force on the electron e1 from the proton and electron e2 (4) 7.4.2 Magnitude of the net electric field strength at electron e1 from the proton and electron e2 (3) [15] Copyright reserved Please turn over

QUESTION 8 (Start on a new page.) NW/September 2025 The circuit diagram below shows three light bulbs, a voltmeter, a battery and two ammeters of negligible resistance. L1, Le and Ls are IDENTICAL light bulbs, each with a resistance R. The battery has an EMF of 26 V and an internal resistance of 0,6 Q. Y gi 2 poses SBN. a, 54 060 i a + t H| if 8.1. What is the function of the ammeter A: in this circuit? 8.2 When both switches are closed, Ai reads 5A. Caiculate the: 8.2.1 8.2.2 8.2.3 8.2.4 Reading on ammeter Az Value of R Voltmeter reading (1) (3) (5) (3) Energy dissipated by the light bulb that is in series with ammeter Az in 2 minutes 8.3 Switch S2 is now OPENED and S: remains closed. 8.3.1 8.3.2 How will this change affect the value of the lost volts? (3) Choose from INCREASES, DECREASES or REMAINS THE (1) SAME. Explain the answer to QUESTION 8.3.1. Copyright reserved (3) [19] Please turn over

NW/September 2025 QUESTION 9 (Start on a new page.) The simplified diagram below represents a DC generator with a coil rotating clockwise and current flowing in the coil. 9.1 State the energy conversion that takes place in the generator. (2) 9.2 Whats the direction of the current in the coil? Write A to B or BtoA. (2) 9.3. State TWO changes that can be made to the generator to increase the EMF. (2) A speaker is now connected to the device above, as shown in the diagram below. © | SLAB ATCC | The peak value of current of the speaker is 23 A and the speaker has a resistance of 13 Q. 9.4 Define the roof mean square current. (2) 9.5 Calculate the: 9.5.1 Root mean square current of the speaker (3) 9.5.2 Peak value of the voltage (3) [14] Copyright reserved Please turn over

NW/September 2025 QUESTION 10 (Start on a new page.) During a photoelectric investigation, a packet of light energy, A, of 4,8 x 10°19 J is shone onto a metal surface, as shown in the diagram below. ®.,, The metal surface has a threshold frequency of 8,1 x 1014 Hz. 10.1 Give the term for the underlined phrase above. (1) 10.2 Define the term threshold frequency. (2) 10.3 Will this packet of light energy be able to eject an electron from the surface of this metal? Choose from YES or NO. Support the answer with a suitable calculation. (4) The packet of light energy, A, is now replaced by another one, B. B with 7,68 x 10°'9 J is allowed to shine on the same metal surface. 10.4 Calculate the maximum speed of the ejected photoelectrons when the packet of light energy, B, is shone onto the metal surface. (4) 10.5 How will the maximum speed of the ejected photoelectrons change if the intensity of the light energy, B, is decreased? Choose from INCREASES, DECREASES or REMAINS THE SAME. (1) 10.6 Explain the answer to QUESTION 10.5. (1) [13] TOTAL: 150 Copyright reserved

NW/September 2025 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* Radius — Aare ea ae em 5 li ms 9,11 x 10% kg Copyright reserved Please turn over

TABLE 2: FORMULAE/TABEL 2: FORMULES MOTION/BEWEGING NW/September 2025 Ve= vit adt Ax =viAt + sat? or/of Ay =viAt+ + aAt? vi2=vi2+ 2aAx orlof ve2=vi2+ 2aAy ax=(“*)at orfof Ay= Cat FORCE/KRAG Fret = ma p=mv fo = N f= WKN FreAt= Ap w=mg Ap = mvr- mvi — n,n Mime _ 7 mime M M F=G 2 or/of FeG—3~ 9°63 or/of g=Ga WORK, ENERGY AND POWER/ARBEID, ENERGIE EN DRYWING W = FAxcosé U=mgh orlof E,=mgh 1 1 Wret= AK or/of Wnet = AEk K=smv? orlof Ex= >mv? 2 2 AK =Kr—Ki or/of AEk = Ext — Exi nc = AK + AU or/of Whe = AEx + AEp WwW Pore Pave=FVave / Pgemia = FVgemia WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG v=fA Tee _VEVE l = Viv he LS Viv, 8 ~ View > E=hf or/of E=> E=Wo + Eximaximaks) Or/of E=Wo + Kimaximaks) where/waar 1 E=hf and/en Wo=hfo and/en — Eximaximaks) = ; i a orlof — Kmaximaks = 2 MVinax/maks Copyright reserved Please turn over

ELECTROSTATICS/ELEKTROSTATIKA NW/September 2025 le p KOs _kQ ee ~ Ww F Ve = q q Q Q n=— orlof = n=— e q ELECTRIC CIRCUITS/ELEKTRIESE STROOMBANE emf (€) = 1(R +r) Vv ea emk (€)=(R +) Rs=Rit Rot... 4.1.1 q=lat —=—+ —+,, Rp Ri Ro W=Vq = sliboe 7 sasha eke ms iv “R ALTERNATING CURRENT/WISSELSTROOM = Imax = Imaks Inms = Vz / Iwok = v2 Vi Vv, Vins = 1 Vuk = ES Pave = Vrms Inms / Pgem = Vwgk wok Pave=lngR J Pao = 12, vi, Vom ave = ar 1 Pgem = — Copyright reserved