Physical Sciences Grade 12 P1 Limpopo Mock 2025 QP

NATIONAL SENIOR CERTIFICATE POPP PSCUSSS OTC Eee = « ry = a i PHYSICAL SCIENCES: . 4 PHYSICS (P1) 4 " SEPTEMBER 2025 : ee eae aC a aiara laren wrereTarereTarere © S=rnywrerwrerereletererrerirarens arate?” MARKS: 150 TIME: 3 HRS MIMI This question paper consists of 17 pages and 3 data sheets Copyright reserved Please turn over

LimpopoDoE/September 2025 INSTRUCTIONS AND INFORMATION 1. Write your NAME in the appropriate space on the ANSWER BOOK 2. This question paper consists of 9 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 sub questions, e.g. between QUESTION 2.1 and QUESTION 2.2. 6. You may use a non-programmable calculator. 7 i 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. 11. Give brief motivations, discussions et cetera where required. 7. Write neatly and legibly. Copyright reserved Please turn over

LimpopoDoE/September 2025 QUESTION 1: MULTIPLE CHOICE QUESTIONS Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write the letter (A-D) next to the question numbers (1.1 - 1.10) in the ANSWER BOOK, e.g. 1.11 E. 1.1. Which ONE of the following statements regarding kinetic friction is TRUE? A B c D It is equal to the normal force and the friction coefficient It is inversely proportional to the normal force on the object It is dependent on the surface area of the object It is directly proportional to the normal force on the object (2) 1.2. The gravitational acceleration on the surface of the Earth is g. The gravitational acceleration on another planet whose mass is FOUR TIMES and the radius TWO TIMES that of the Earth, is... A B Cc D 1 29 g. 2g. 49. (2) Copyright reserved Please turn over

LimpopoDoE/September 2025 1.3. An object is dropped from a height h above the ground. Neglect the effects of air resistance. Which ONE of the following sketch graphs BEST represents the relationship between its kinetic energy (Ex) and its height above the ground? A B Ex Ex (2) 1.4 Study the following sketch graph. Foet The area between the graph and the time axis is EQUAL TO the... A change in momentum. B displacement. Copyright reserved Please turn over

LimpopoDoE/September 2025 vu snumentum. D change in kinetic energy. (2) 1.5. Abody falls freely from REST. After it has “lost” E joules of the gravitational potential energy, its speed is v m:s*'. The mass (m), in kg, of the body is equal to... v2 A 2g" Lf B sat c ke > »o # ual (2) 1.6 A\listener is moving towards a stationary sound source. Asketch graph of the ratio (fi: fs)-versus-ve is shown below: 2 = Which ONE of the following combinations gives the value of the intercept, P, and the gradient, m, of the graph CORRECTLY? P m 1 T Vv 1 Vv 1 2 =i v Z -v (2) Copyright reserved Please turn over

1.7 18 LimpopoDoE/September 2025 Two charged particles in a vacuum exert electrostatic forces on each other. The system of the particles is changed in such a way that the force that one particle exerts on the other particle is 25% of the INITIAL FORCE. Which ONE of the following statements BEST represents what happened during the process of transformation? A The charge on one of the particles is doubled. B The charges on both particles are doubled. c The distance between the two particles is doubled. D The distance between the two particles is halved. A hairdryer is rated 1200 W. It is used for a total of 15 minutes. If the cost of electricity is R3,40 per kWh, the total cost will be... A R 1,02 B R6,12 c R 61,20 D R 10,20 Copyright reserved Please turn over (2) (2)

LimpopoDoE/September 2025 1.9 The following sketch graph shows the change in current in a generator. _ w t ' Time (s) Current (A) 1,3b---=---4 Which ONE of the following combinations of statements correctly describes the generator? Type of Generator No of rotations Inms A bc % 1,3 B AC 1 0,92 c AC A 1,3 D DC 1 0,92 (2) Copyright reserved Please turn over

LimpopoDoE/September 2025 1.10 The following two diagrams illustrate the simple differences between atomic absorption and emission spectra. Spectrum A Spectrum B /—_— E — E E; x —— Ep Ey Which ONE of the following combinations regarding the spectra is CORRECT? SPECTRUMA | LIGHT SPECTRUM B | LIGHT FREQUENCIES FREQUENCIES A | Emission Absorbed Absorption Emitted B | Absorption Absorbed Emission Emitted C | Emission Emitted Absorption Absorbed D | Absorption Emitted Emission Absorbed (2) [20] Copyright reserved Please turn over

LimpopoDoE/September 2025 QUESTION 2 (Start on a new page) Alarge 18-wheel truck drives down a mountain pass as illustrated in the diagram below. The total mass of the truck and its load is 40 000 kg. The truck driver must decide to use the arrestor bed on a horizontal surface (represented by BC) to keep the truck and other road users safe. The truck accelerates down the 400-m slope (AB) with an initial speed of 5,4 m-s"' at point A. The driver appties a braking force of 10 000 N from point A to point B. The kinetic friction coefficient between the wheels and the road is 0,42. Arrestor bed Neglect the effects of air resistance. 2.1. State Newton's second law of motion in words. (2) 2.2 Drawa labelled free body diagram for the truck whilst moving down the incline. (4) 2.3. Calculate the: 2.3.1 Component of the gravitational force that acts parallel to the incline (2) 2.3.2 Work done by the brakes over 400 m (3) 2.4 The driver realises that he is in trouble and enters the arrestor bed. Assume that the driver has completely lost control of the braking system. 2.4.1 Calculate the speed of the truck as it enters the arrestor bed, at point B, without using any energy considerations. (5) 2.4.2 Define the term impulse in words, as applied in Physics. (2) 2.4.3. The truck comes to a standstill after travelling 55 m in 2,5 s. Calculate the magnitude of the average frictional force provided by the gravel in the arrestor bed, by using the impulse-momentum theorem. (4) 2.4.4 Calculate the work done by friction. (3) [25] Copyright reserved Please turn over

MpopoDoE/September 2025 QUESTION 3 (Start on a new page) Aperson standing on the roof of a three storey building throws a ball vertically upwards from point Aat an unknown velocity. The ball moves upwards and upon falling towards the ground, bounces off a roof of the ground floor level (B) and eventually hits the ground at point C. Ignore any horizontal motion and air friction. 3.1 3.2 3.3 3.4 3.5 Explain what is meant by a projectile. The ball reaches a maximum height of 7 m above the starting point A. Calculate the initial velocity of the ball. It takes the ball 2,83 s to reach the roof of the ground floor (B). Calculate the velocity with which it reaches the roof. The ball leaves the roof of the first storey (B) with 75% of the velocity with which it hits the roof. It hits the ground at the point C with a velocity of 14,93 m-s* . Calculate the time the ball takes from B to C. Use the information from QUESTIONS 3.2 - 3.4 to calculate the height of point A above point C. Copyright reserved Please turn over (2) (3) (3) (5) (S) [18]

LimpopoDoE/September 2025 QUESTION 4 (start on a new page) The diagram below shows three stages of the movement of two IDENTICAL small metal balls, each of mass 85 g, before, during and after collision. Stage 1 Stage 2 Stage 3 cf -_ mr ~Se™ Cc (Before Colliston) (During Collision) (After Collision) Neglect the effect of air friction. 41 Calculate the mechanical energy of ball A in STAGE 1 if the vertical height hi =0,7 m. (3) 4.2 Hence, determine the speed with which ball A strikes ball B during STAGE 2. (3) 43 State, in words, the principle of conservation of linear momentum. (2) 44 Use the principle in QUESTION 4.3 to calculate the velocity of ball B just after the collision (STAGE 3) (4) 45 Write down the value of hz, as shown in STAGE 3. (1) [13] Copyright reserved Please turn over

LimpopoDoE/September 2025 QUESTION 5 (Start on a new page) The diagram below shows a roller coaster train moving on a track. B represents the highest point where the amount of kinetic energy is a minimum. If the track has a higher friction, the train might get stuck. The train has a mass 4 410 kg. Point B Height: 37 m Point A Height: 23 m Point C Height: 1,5 m 5.1 State the principle of conservation of mechanical energy in words. (2) The train passes point A with a velocity of 18 m-s*' towards point B. 5.2 Calculate the velocity with which the train reaches point B. (4) 5.2 Assume that the track is an isolated system from A to B. 5.3 The train moves past point C at a speed of 25 m:s*. 5.3.1 Calculate the work done by friction as the train moves from point Bto (4) point C. 5.3.2 Is this system ISOLATED? State only YES or NO. Suggest a reason for the answer. (2) [12] Copyright reserved Please turn over

LimpopoDoE/September 2025 QUESTION 6 (Start on a new page) A Cessna airplane is flying at an unknown constant speed towards a stationary observer on the ground. The plane’s engine emits a steady sound with a frequency of 1 000 Hz. After passing directly overhead, the observer hears a change in the sound. Speed of sound in air is taken as 340 ms" 6.1 Name the wave phenomenon that is observed. (1) 6.2 The observer detects a frequency of 2428,57 Hz as the plane approaches. Calculate the speed of the airplane. (4) 6.3 What change in frequency of sound is detected as the airplane moves away from the observer? Write down only INCREASES, DECREASES or REMAINS THE SAME. Justify the answer with reference to the OBSERVED WAVELENGTH. (2) 6.4 Name ONE application of this phenomenon in medical fields. (1) [8] Copyright reserved Please turn over

LimpopoDoE/September 2025 QUESTION 7 (Start on a new page) Two simitar charged particles, R and T, are placed 3x meters apart, as shown in the diagram below. T +62 nc The electrostatic force that R exerts on T is 3,5 pN. P is a point between R and T. 7.1 Define the term electric field at a point in words. (2) 7.2 Calculate the: 7.2.1 Electric fieid at T due to charged partcle R (3) 7.2.2 Charge on particle R if the NET ELECTRIC FIELD at P is ZERO (4) 7.2.3 Value ofx (4) Particles R and T are now allowed to touch. 7.3 In what direction will electrons flow? Only write R to T or T toR (1) 74 Calculate the new charge on EACH of the two particles, R and T. (2) [16] Copyright reserved Please turn over

LimpopoDoE/September 2025 QUESTION 8 (Start on a new page) The following circuit diagram consists of four resistors with IDENTICAL resistance. Both switches are open. The reading on Vr is 12 V. $1 is closed and the reading of Vr decreases to 11,3 V. 8.1 Define the term emf in words. (2) 8.2 Calculate the reading on A. (3) $2 is NOW closed, which causes a change in the reading on A. 8.3 How will the reading on A change? Only write INCREASE, DECREASE or REMAIN THE SAME. (1) 8.4 Explain the answer to QUESTION 8.3 above without showing any calculations. —_ (2) Copyright reserved Please turn over

LimpopoDoE/September 2025 The reading on Vsis 11,10 V. Calculate the: 8.5 Resistance of Ra (5) 8.6 Current through Ri (3) [16] QUESTION 9 (start on a new page) The following diagram shows a simple GENERATOR. B7VC s 9.1 State the energy conversion that takes place in a generator. (2) 9.2 What type of generator (AC or DC) is illustrated in the diagram? Refer to the diagram and give a reason for the answer. (2) 9.3 The frequency of the generator is 50 Hz. Calculate the period. (2) 9.4 The rms voltage is 220 V. 9.4.1 Define the term rms voltage (2) 9.4.2 Calculate the maximum voltage induced in the coil (3) 9.5 Sketch a voltage-versus-time graph for two full rotations of the coil. Clearly show the values of the following on the graph: e Period of the full rotation (1 cycle) e Vmax (3) Copyright reserved Please turn over

LimpopoDoE/September 2025 [14] QUESTION 10 (start on a new page) Electromagnetic (EM) waves have the ability to expel electrons from certain surfaces under certain conditions. This process also illustrates a specific nature of light. A group of learners conducts an investigation by shining different EM waves on a sodium metal surface to determine if electrons are emitted. The work function of sodium metal is 3,66 x 10°19 J. Infrared Visible light Ultraviotet light X-rays Metal surface EM Waves Frequency (Hz) Infrared waves 108 Visible light 4x 104 Ultraviolet 405 X-rays 40" 10.1 Define the term work function of a metal in words. (2) 10.2 NAME the phenomenon and STATE the characteristic of EM waves demonstrated in this investigation. (2) 10.3. Calculate the maximum speed of photo-electrons that are emitted when the EM wave with highest energy in the investigation, is used. (4) [8] Grand Total: 150 Copyright reserved Please turn over

LimpopoDoE/September 2025 DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 1 (PHYSICS) TABLE 1: PHYSICAL CONSTANTS NAME SYMBOL VALUE Acceleration due to gravity 9 9,8 m-s? Universal gravitational constant G 6,67 x 10° N-m?-kg? Speed of light in a vacuum c 3,0 x 108 ms Planck's constant h 6,63 x 104 J-s Coulomb's constant k 9,0 x 109N-m?:C2 Charge on electron e 1,6 x 10°79C Electron mass Me 9,11 x 10°" kg Mass of the Earth M 5,98 x 1074 kg Radius of the Earth Re 6,38 x 10° m Copyright reserved Please turn over

TABLE 2: FORMULAE Limpopo DoE/September 2025 MOTION v, =V,+aAt Ax =v At+fadt? OR Ay =v,At+tadt? v2 =v +2adx OR v,2=v,2+2ady | Ax= (“$+ Jas OR Ay -(4%) At FORCE Fat =ma p=mv =n N f= myN Fr At =Ap wg Ap=mwv, _ Mm, Gm,m Gm,m GM GM WORK, ENERGY AND POWER/ARBEID, ENERGIE EN DRYWING W =FAxcos@ U=mgh OR Ep,=mgh 1 4 Wyre = AK OR Wret = AE, K=5 mv’ OR £E,==mv? AK=K,-K, OR AE, =Ey—E, W,,=AK+AU OR W,, = AE, +AE, p= Pave = EV aie WAVES, SOUND AND LIGHT 1 =f Tes bi f t Ee E=hf OR E=ho viv, r E=W, +Eqmay OR E=W, +Kp., where 1 2 1 2 E=hf and Wy=hf, and Exim = Vine OR Koax = 5 nex Copyright reserved Please turn over

Limpopo DoE/September 2025 ELECTROSTATICS kQ,Q. kQ a Eo wv e-F q q n= Q OR n= Bt e q. ELECTRIC CIRCUITS R-¥ emf (e) = (R +r) R, =R, +R, + 1.1.4 qual —=—+—+.. R, R, R, W -Vaq putt At W=ViAt P=VI W =PRAt P =PR 2 we V*At » _ve R ALTERNATING CURRENT Pave = Vine lems 1. =i v2 Px =12,R V, Vv. =m 2 Copyright reserved Please turn over