Physical Sciences Grade 12 P1 Eastern Cape Mock 2023 QP

NATIONAL SENIOR CERTIFICATE GRADE 12 SEPTEMBER 2023 PHYSICAL SCIENCES P1 MARKS: 150 TIME: 3 hours This question paper consists of 19 pages including a 3-page data sheet.

2 PHYSICAL SCIENCES P1 (EC/SEPTEMBER 2023) INSTRUCTIONS AND INFORMATION 1. Write your full NAME and SURNAME in the appropriate spaces on the ANSWER BOOK. 2. Answer ALL the questions. 3. You may use a non-programmable calculator. 4. You may use appropriate mathematical instruments. 5. Number the answers correctly according to the numbering system used in this question paper. 6. You are advised to use the attached DATA SHEETS. 7. Show ALL formulae and substitutions in ALL calculations. 8. Give brief motivations and discussions where required. 9. Round off your FINAL numerical answers to a minimum of TWO decimal places. 10. Start EACH question on a NEW page. 11. All diagrams are NOT necessarily drawn according to scale. 12. Write neatly and legibly. Copyright reserved Please turn over

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1 3 QUESTION 1: MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, for example 1.11 E. 1.1 Which ONE of the following quantities is a measure of the inertia of a body? A Acceleration B Energy C Velocity D Mass (2) 1.2 The velocity-time graph below represents the motion of an object under the influence of gravitational force only. v Velocity (m·s-1) 3t t Time(s) -2v The displacement of the object at time 3t is … A vt. B -vt. -3 C vt. 2 D Zero. (2) Copyright reserved Please turn over

4 PHYSICAL SCIENCES P1 (EC/SEPTEMBER 2023) 1.3 Airbags can protect a driver from serious injury during a collision. Which ONE of the following combinations in the table below best describes the effect that airbags have on the contact time and the net force acting on the driver during the collision and explains why the driver is more protected from injury? CONTACT TIME NET FORCE A Increases Increases B Increases Decreases C Decreases Increases D Decreases Decreases (2) 1.4 An object is projected vertically upwards from the ground and reaches a maximum height h. Which ONE of the following statements regarding the movement of the object from the ground to height h is correct? Ignore the effects of air friction. A The mechanical energy of the object at height h is zero. B The change in kinetic energy of the object is zero. C The loss in the object’s kinetic energy is equal to the gain in the object’s gravitational potential energy. D The work done on the object is equal to zero. (2) 1.5 The force on gravitational attraction on the earth is 6 times greater than on the moon. The reason for this is: A The moon has no water on its surface. B The mass and the radius of the earth is greater than that of the moon. C Only the mass of the earth is greater than the mass of the moon. D Only the radius of the earth is greater than the radius of the moon. (2) 1.6 An observer moving at a constant speed away from a stationary sound source, observes that the pitch of the sound waves decreases. This is because the following happens: WAVELENGTH FREQUENCY A Increases Decreases B Decreases Remains the same C Increases Increases D Decreases Increases (2) Copyright reserved Please turn over

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1 5 1.7 Three identical positive point charges, Q1, Q2 and Q3, are arranged as shown in the diagram below. Which ONE of the following diagrams is the correct representation of the NET electrostatic force experienced by charge Q2? A B C D (2) Copyright reserved Please turn over

6 PHYSICAL SCIENCES P1 (EC/SEPTEMBER 2023) 1.8 In the circuit diagram below, light bulbs X and Y are identical. Switch S is open. X A X Y S Switch S is now closed. Which ONE of the following combinations below best describes the change in the total resistance of the circuit and the ammeter reading when switch S is closed? TOTAL RESISTANCE AMMETER READING A Increases Decreases B Increases Remains the same C Decreases Increases D Decreases Remains the same (2) 1.9 A lamp is connected to an AC generator, and it glows with the same brightness as when it is connected to a DC generator producing a potential difference of Y volts. The power dissipated by the lamp when connected to the AC generator is equal to … A Y (IMAX). √2 B 1 Imax(Y). 2 C Imax (Y). D Y (Irms). (2) √2 Copyright reserved Please turn over

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1 7 1.10 The graph below shows the relationship between maximum kinetic energy of ejected photo-electrons and the frequency of the incident photon. What do the intercepts P and Q on the graph represent? INTERCEPT P INTERCEPT Q A Planck’s constant Threshold frequency B Threshold frequency Work function C Work function Threshold frequency D Threshold frequency Planck’s constant (2) [20] Copyright reserved Please turn over

8 PHYSICAL SCIENCES P1 (EC/SEPTEMBER 2023) QUESTION 2 A truck of mass 1 300 kg is connected to a car of mass 950 kg by means of an inextensible, massless rope, R, and pulls the car along a straight horizontal rough road. The engine of the truck applies a force of 9 000 N to move the truck-car combination to the left as shown in the diagram below. The truck experiences a constant frictional force of 3 500 N. The truck and car move at a CONSTANT VELOCITY. Ignore the rotational effects of the wheels. 2.1 A learner states that if the truck comes to a sudden stop, the car will continue moving at a constant velocity. Which physics law did this learner apply to make this statement? (1) 2.2 Draw a labelled free-body diagram of all forces acting on the truck. (5) 2.3 Calculate the: 2.3.1 Tension in the rope connecting the truck and the car (3) 2.3.2 The coefficient of kinetic friction between the car and the road (4) 2.4 The rope between the truck and the car suddenly breaks and the car continues to move to the left before coming to rest. Calculate the magnitude of the acceleration of the car after the rope breaks. (3) [16] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1 9 QUESTION 3 A group of learners set up an experiment to determine the height h of their school. They release a tennis ball from point A at the edge of the roof of the school building as shown in the diagram below. Point B is 2 m above the ground and the ball takes 0,125 s to cover the distance from point B to the ground (point C). Ignore the effects of air friction. A Ball h h B 2m C 3.1 Write down the magnitude of the rate of change of velocity of the ball. (1) 3.2 Calculate the: 3.2.1 Height, h, of the school building (5) 3.2.2 Time it takes for the ball to reach the ground (4) 3.2.3 Velocity with which the ball strikes the ground (3) 3.3 Sketch a position versus time graph for the motion of ball from the moment it was released until it strikes the ground. Use the ground as the zero- reference point. Indicate the following on the graph: • The height from which the ball was released • Time when the ball strikes the ground (3) [16] Copyright reserved Please turn over

10 PHYSICAL SCIENCES P1 (EC/SEPTEMBER 2023) QUESTION 4 Two trolleys, A of mass 1 kg, and B of mass 2 kg, are held stationary on a smooth horizontal surface with a compressed spring between them, as shown in the diagram below. The spring is released and falls to the ground. Trolley A moves to the right at a constant velocity of 5,0 m·s-1 and collides with a wall. Assume this is an isolated system. Wall B A 4.1 Define an isolated system. (2) 4.2 Calculate the velocity of trolley B immediately after the spring is released. (4) 4.3 The average force exerted by the wall on trolley A is 80 N and the collision of the trolley with the wall lasts 0,5 seconds. Calculate the velocity with which trolley A moves away from the wall. (4) 4.4 A learner comments that the collision of trolley A with the wall is inelastic. Briefly explain what is meant by an inelastic collision. (2) [12] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1 11 QUESTION 5 A crate of mass 50 kg is at rest at point A which is at a vertical height of 5 m above the horizontal surface. The inclined surface makes an angle θ with the horizontal, as shown in the diagram below. When the crate is released, it slides down the incline and reaches point B at the bottom of the incline with a speed of 8 m·s-1. The incline exerts a constant frictional force of 72 N on the crate while it slides from A to B. 5.1 State the work-energy theorem in words. (2) 5.2 Use energy principles to calculate the angle θ. (6) After passing point B, the crate slides along a rough horizontal surface, coming to rest at point C, which is 10 m away from point B. 5.3 Draw a free body diagram of all forces acting on the crate while it slides from B to C. (3) 5.4 Calculate the work done by the frictional force to bring the crate to rest. (4) [15] Copyright reserved Please turn over

12 PHYSICAL SCIENCES P1 (EC/SEPTEMBER 2023) QUESTION 6 A police van with its siren on, travels at a constant speed between two observers, A and B. Observer A detects sound with a frequency of 545 Hz from the siren, while observer B detects a frequency of 615 Hz. 6.1 State the Doppler effect in words. (2) 6.2 In which direction is the police van moving? Choose from TOWARDS OBSERVER A or TOWARDS OBSERVER B. Give a reason for your answer. (2) 6.3 The speed of sound in air is 343 m·s-1. Calculate the frequency of the siren. (7) 6.4 Spectral lines of a certain gas observed from a distant star appear to be red shifted. Explain this observation by referring to the MOTION OF THE STAR and the FREQUENCY of the spectral lines. (2) [13] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1 13 QUESTION 7 Two-point charges, P and T, are placed 0,03 m apart. The charge on P is +36 x 10-6 C while T carries a charge of 16 x 10-6 C of UNKNOWN SIGN. 7.1 State Coulomb’s law in words. (2) 7.2 Draw the electric field pattern around a positive charge. (3) 7.3 Calculate the magnitude of the force that charges P and T exert on each other. (3) When a test charge is placed at point X, a distance r m to the right of charge T as shown in the diagram below, the test charge remains STATIONARY. 7.4 Write down the sign of the charge (POSITIVE or NEGATIVE) of T. Explain your answer. (3) 7.5 Calculate the distance r. (5) [16] Copyright reserved Please turn over

14 PHYSICAL SCIENCES P1 (EC/SEPTEMBER 2023) QUESTION 8 Three resistors and an electrical device rated 16 W are connected to a battery of emf 36 V and unknown internal resistance r, as shown in the circuit diagram below. Ammeter A2 reads 2 A when switch S is closed. 𝜺 = 36 V S r A2 2A A1 8Ω 10 Ω 16 W 2Ω DEVICE 8.1 Define the term emf of a battery in words. (2) 8.2 Calculate the: 8.2.1 Resistance of the electrical device (3) 8.2.2 Current passing through the battery (5) 8.2.3 Internal resistance r of the battery (6) 8.3 The switch S is now opened. How will this affect the reading on ammeter A1? Choose from INCREASE, DECREASE or REMAIN THE SAME. Explain your answer. (2) [18] Copyright reserved Please turn over

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1 15 QUESTION 9 A coal power station uses AC generators to produce electricity. 9.1 State the energy conversion that takes place in a generator. (2) 9.2 Draw a sketch graph of emf generated versus time for two complete cycles for an AC generator. (2) 9.3 Alternating current is used for the long-distance transmission of electricity. Give a reason why AC is preferred over DC to transmit electricity over long distances. (1) 9.4 An electrical kettle is marked 220 V. What does the 220 V represent? (1) 9.5 A certain AC generator produces a peak current of 6,25 A when connected to an electrical kettle of resistance 45 Ω. Calculate the: 9.5.1 Root mean square (rms) current (3) 9.5.2 Average power dissipated by the kettle when connected to this generator (3) [12] Copyright reserved Please turn over

16 PHYSICAL SCIENCES P1 (EC/SEPTEMBER 2023) QUESTION 10 An investigation is done to determine the effect of the power of a light bulb on the current which is generated in a photo-electric cell. The apparatus used in this investigation is shown in the simplified diagram below. Ultraviolet light of wavelength 490 nm emitted by two bulbs, A and B, is shone onto the cathode of the photo-electric cell and the maximum speed of the ejected photo-electrons is measured. UV Light source + e- A The results of their investigation are shown on the table below. BULB POWER OF LIGHT BULB MAXIMUM SPEED OF PHOTO-ELECTRONS A 100 W 7,5 x 105 m·s-1 B 200 W 7,5 x 105 m·s-1 10.1 Describe the term photoelectric effect. (2) 10.2 Briefly explain why the power of the light bulbs does not affect the maximum speed of the ejected photo-electrons. (2) 10.3 Which ONE of the light bulbs, A or B, will produce the highest reading on the ammeter? Explain your answer. (2) 10.4 Calculate the: 10.4.1 Energy of the ultraviolet photons (3) 10.4.2 Work function of the metal cathode (4) [13] TOTAL: 150 Copyright reserved Please turn over

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1 17 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 SYMBOL/ NAME/NAAM VALUE/WAARDE SIMBOOL Acceleration due to gravity / g 9,8 m•s-2 Swaartekragversnelling Universal gravitational constant / G 6,67 × 10-11 N•m2.kg-2 Universelegravitasiekonstant Speed of light in a vacuum / Spoed van lig in ʼn c 3,0 × 108 m•s-1 vakuum Planck’s constant / Planck se konstante h 6,63 × 10-34 J•s Coulomb’s constant / Coulomb se konstante k 9,0 × 109 N•m2•C-2 Charge on electron / Lading op elektron e -1,6 × 10-19 C Electron mass / Elektronmassa me 9,11 × 10-31 kg Mass of earth / Massa op aarde M 5,98 × 1024 kg Radius of earth / Radius van aarde RE 6,38 × 106 m TABLE 2: FORMULAE/TABEL 2: FORMULES MOTION/BEWEGING v f = vi + a t Δx = v i Δt + 21 at 2 or/of Δy = v i Δt + 21 at 2 2 2 2 2  v + vf   v + vf  v f = v i + 2ax or/of v f = v i + 2ay Δx =  i  Δt or/of Δy =  i  Δt  2   2  FORCE/KRAG Fnet = ma p = mv fsmax = µsN fk = µkN Fnet t = p w = mg p = mv f − mv i Gm1 m2 M F= g = G d2 d2 Copyright reserved Please turn over

18 PHYSICAL SCIENCES P1 (EC/SEPTEMBER 2023) WORK, ENERGY AND POWER/ARBEID, ENERGIE EN DRYWING W = F Δx cos θ U = mgh or/of Ep = mgh Wnett = ΔK or/of Wnett = ΔEk K = ½mv2 or/of Ek = ½mv2 ΔK = Kf - Ki or/of ΔEk = Ekf – Eki W Wnc = ΔK + ΔU or/of Wnc = ΔEk + ΔEp P= t Pave = Fv 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 + Ek(max) where/waar E = hf and/en W0 = hf0 and/en Ek(max) = ½mvmax2 or/of K(max) = ½mvmax2 ELECTROSTATICS/ELEKTROSTATIKA kQ 1Q 2 kQ F= E= r2 r2 W F V= E= q q n=Q qe Copyright reserved Please turn over

(EC/SEPTEMBER 2023) PHYSICAL SCIENCES P1 19 ELECTRIC CIRCUITS/ELEKTRIESE STROOMBANE emf ( ε ) = I(R + r) R=V I Rs = R1 + R2 + R3 + … 1 1 1 Q = IΔt = + + ... R p R1 R 2 W = Vq W P= W = VIΔt t W = I2RΔt P = VI V2Δt W= R P = I2R V2 P= R ALTERNATING CURRENT/WISSELSTROOM Pav erage = Vrms I rms / Pgemiddeld = Vwgk I wgk I Irms = max / I I wgk = maks 2 2 Pav erage = I rms 2 R / Pgemiddeld = I 2wgk R Vmax Vmaks Vrms = / Vwgk = 2 2 2 V2 Vwgk Pav erage = rms / Pgemiddeld = R R Copyright reserved Please turn over