Physical Sciences Grade 12 P1 NSC June 2012 QP (Eng)

Downloaded from hlayiso.com basic education Department: Basic Education REPUBLIC OF SOUTH AFRICA SENIOR CERTIFICATE EXAMINATION PHYSICAL SCIENCE P1 PHYSICS HIGHER GRADE 2012 PHYSICAL SCIENCE HG: Paper 1 3041E MARKS: 200 AMAA TNE: Zhou 30411E This question paper consists of 16 pages, 2 data sheets and 1 answer sheet. X@5 OMT Copyright reserved {IMI itll UU IIT UltAl Il Please turn over

Downloaded from hlayiso.com Physical Science/HG/P1 2 DBE/2012 SCE INSTRUCTIONS AND INFORMATION ao Write your centre number and examination number 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. Data sheets are attached for your use. 6. NOTE: The following circuit diagram symbols are used in this paper: Resistor: 4 L- instead of —/VW/\+— Bulb: +X) instead of _GaAD— _ You may forfeit marks if you do not follow instructions. QUESTION 1 INSTRUCTIONS 1. Answer this question on the ANSWER SHEET. [NOTE: The ANSWER SHEET may either be a separate sheet provided as part of your question paper, or printed as part of the ANSWER BOOK.] Write your centre number and examination number in the appropriate spaces, if a separate ANSWER SHEET is used. 2. Various options are provided as possible answers to the following questions. Each question has only ONE answer. Choose the answer, according to your opinion, that is the correct or best answer. Choose the answer and make a cross (X) in the block (A-D) next to the question number (1.1-1.15) on the ANSWER SHEET. 3. Do not make any other marks on the ANSWER SHEET. Any calculations or writing that may be necessary when answering this question should be done in the ANSWER BOOK and must be deleted clearly by means of a line drawn across the page. 4. If more than ONE block is marked per question, no marks will be awarded for that answer. PLACE THE COMPLETED ANSWER SHEET INSIDE THE FRONT COVER OF THE ANSWER BOOK, IF A SEPARATE ANSWER SHEET HAS BEEN USED. EXAMPLE: QUESTION: The SI unit of time is ... A t. B h. Cc s. D m. ANSWER: A |B D [NOTE: This layout may vary, depending on the type of ANSWER SHEET used by the province.] conrad A 0 A Paseo tm ove

Downloaded from hlayiso.com Physical Science/HG/P1 3 DBE/2012 SCE QUESTION 1 1.1. Four forces act at a point X as shown in the following sketch: 7N 5N x 13N 17N Which ONE of the following can be used to find the resultant of the four forces in the diagram? 8N 8N A B 10N 10N R R 18N D 18N c 24N 24N R R (4) 7 The sketch below shows a car travelling to the right and slowing down in a given time. a . ° To the right > Which ONE of the following pairs of physical quantities, associated with the car's motion, MUST then also be to the right? A Velocity and momentum B Velocity and acceleration Cc Momentum and resultant force D Resultant force and acceleration (4) as 0 Posse um oer

Downloaded from hlayiso.com Physical Science/HG/P1 4 DBE/2012 SCE 1.3. In the equation of motion v = u + at the physical quantity and unit of measurement for the expression at is ... A B 14 displacement in m. acceleration in m.s”. velocity in m.s™. velocity in m?.s?. (4) A toy car is pulled across a frictionless horizontal surface by means of a string. The string exerts a constant force on the toy car. After a while the string breaks. Which ONE of the following graphs best represents the velocity-time graph of the toy car for its entire motion? A B a v IY Vv a we a nT a t t Cc D Vv Vv > ————_—_> t t (4) Sorat eee a gg imei

Downloaded from hlayiso.com Physical Science/HG/P1 5 DBE/2012 SCE a7 Two trolleys X and Y of mass m and 2 m respectively, are positioned on a frictionless track with a compressed spring between them as shown in the following diagram. When the spring is released the trolleys move apart due to the force exerted by the spring. The ratio of the acceleration experienced by trolley X to the acceleration experienced by trolley Y is ... A 1:05 B 422 C 1:3 D 1:4 (4) 1.6 A flatbed truck carrying a 600 kg concrete block, near the back of its flatbed, is travelling to the right along a straight level road at 30 m.s™. 600 kg : : i Driver's cab 1 OS ©) The truck collides head on with a stationary truck and stops immediately. The concrete block slides into the back of the driver's cab. Which ONE of the following is the best explanation why the block slides forward? A The truck exerts a force on the block. B The inertia of the concrete block causes it to slide forward. Cc The velocity of the concrete block relative to the ground remains constant. D The concrete block experiences an acceleration due to a resultant force. (4) Cote men 00 0 nied

Downloaded from hlayiso.com Physical Science/HG/P1 6 DBE/2012 SCE 1.7 Two different masses exert a force F on each other when they are a distance r apart. What will the force be if the distance between them is doubled? F A 4 B EF 2 Cc 2F D 4F (4) 1.8 A learner throws a tennis ball against a fixed, vertical wall and the ball rebounds (returns to the learner after hitting the wall). The collision between the ball and the wall is inelastic. Which ONE of the following graphs best represents the variation of the momentum of the ball with time? ‘am \ —— i —— \ va \ vA \ / p \ / f A B na fa) \ \ \ \ \ \ \ p \ p \ L___y___» ——— res \ t \ t \ \ \ _ \ \ Le D (4) Cc Conn rocend NA A Peo tm ovr

Downloaded from hlayiso.com Physical Science/HG/P1 7 DBE/2012 SCE 7 The mass of an object, M, is twice the mass of another object N. 1.10 ace e Sie Both objects are released simultaneously from the same height. How does the kinetic energy of N compare with the kinetic energy of M just before they strike the ground? (Ignore the effects of air resistance.) The kinetic energy of N is ... A half the kinetic energy of M. B twice the kinetic energy of M. Cc equal to the kinetic energy of M. D a quarter the kinetic energy of M. (4) Two identical, positively charged point charges are placed close to each other. Which ONE of the following diagrams is the CORRECT representation of the resultant electric field pattern which will be obtained due to these two charges? (4) iia LAUT AAA ON UE Meese turn over

Downloaded from hlayiso.com Physical Science/HG/P1 8 DBE/2012 SCE 1.11. Consider an electron positioned between two oppositely charged, parallel plates Mand N. e- Po ee N Which ONE of the following is the CORRECT combination for the direction of the electric field and the direction of motion of the electron between M and N? Ignore the mass of the electron. M Direction of the electric field Direction of motion of electron A from M to N towards M B from M to N towards N Cc from N to M towards M D from N to M towards N (4) 1.12 Two parallel conducting wires carry currents in the same direction. The force that the one wire exerts on the other is ... repelling and inversely proportional to the current in each wire. attracting and inversely proportional to the distance between the wires. repelling and inversely proportional to the distance between the wires. GO © @ Ff attracting and inversely proportional to the current in each wire. (4) Contes ANA A LT Pesotum oer

Downloaded from hlayiso.com Physical Science/HG/P1 9 DBE/2012 SCE 1.13 A small charged particle is held stationary at a distance r from a fixed, positively charged sphere, as indicated in the diagram below. The electric field strength at that point where the particle is situated, is E. Sphere Charged particle ® r 1 If the particle is moved towards the sphere, what will happen to the electric field strength E and the force F that the particle will experience? Electric field strength (E) Force (F) A decrease decrease B decrease increase Cc increase decrease D increase increase (4) 1.14 In the circuit below a 12 V source, with negligible internal resistance, is connected to two resistors in parallel. The resistance of resistor Y is twice that of resistor X. The total current in the circuit is I. 42 | F (v) ww, Y/ Which ONE of the following combinations is CORRECT for the readings on ammeter A and voltmeter V1? Ammeter reading Voltmeter reading A 2 I 12V 3 B 2 i 6V Cc 1 I 12V D al I 6V (4) Tao NAN WA A emnaed

Downloaded from hlayiso.com Physical Science/HG/P1 10 DBE/2012 SCE 1.15 In the circuit below, the internal resistance of the cells and meters can be ignored. | R What will happen to the voltmeter readings when switch S is closed? Vi V2 A decreases increases B increases increases Cc decreases decreases D increases decreases (4) (15x4) [60] Conrihtesoned AA A Psso tum ove

Downloaded from hlayiso.com Physical Science/HG/P1 11 DBE/2012 SCE ANSWER QUESTIONS 2-9 IN THE ANSWER BOOK. INSTRUCTIONS 1. Start EACH question on a NEW page in the ANSWER BOOK. 2. Leave ONE line between two sub-questions, for example between QUESTION 2.1 and QUESTION 2.2. 3. Show ALL formulae and substitutions in ALL calculations. 4. Number the answers correctly according to the numbering system used in this question paper. QUESTION 2 (START ON A NEW PAGE.) A man is supported by two non stretching ropes, AB and BC between two buildings. Rope AB, which is horizontal, will break if the tension in it exceeds 400 N. Cc 2.1 Draw a labelled force diagram to show all the forces acting at point B. Indicate at least ONE angle. (4) 2.2 Which component of the force in BC will balance the force in AB? (2) 2.3 State, in words, the Triangle Rule for forces in equilibrium. (3) 2.4 Calculate the maximum vertical component of the force in rope BC when the force in rope AB is 400 N. (4) 2.5 What is the maximum mass of the man that can be supported by the two ropes? (3) [16] al a a

Downloaded from hlayiso.com Physical Science/HG/P1 12 DBE/2012 SCE QUESTION 3 (START ON A NEW PAGE.) The graph represents the motion of Phiwo running along a straight road in a straight line. The letters A to F represent points in the motion of Phiwo. 400f | jE Eh ea a eH jE OS mr Seen ee 7 The graph of displacement versus time 727-1 Eee EERE cH eet eaecees i BEER EEE t Eee tee [etal : Saeena F i ‘ im cr t i jelerat 1 1 1 fi t A i : crt : eae 300 Serr cot t =a co i HH EH HHH t Here Eee reer t cit Hi Scere T 1 £ i it es ee => i i im T i coo i E ; t ret t Sree reer 250 } ae t 1 cer f lot i i t t i H ¢ Teqaiet a + | _ } H cet 200} | HH if eee i i) cmt Tob J i 150 t tet = t SERRE Ere Hi T CET ry t 1 1. i t im 4 im i! it 1 I i rim i | | : vam t t } HAH 4 1 ret 100}: t r : i ; tert] i t t anon anne 7 c cry coos i mm it Uy i tt 1 4 i J i r i a t 0 100 200 300 400 500 600 700 800 time (s) 3.1 Between which two points on the graph is Phiwo running at a constant velocity away from her starting point? (Use the symbols A, B, etc. in the graph.) (2) 3.2 Use the graph to calculate the constant velocity with which Phiwo is running back towards her starting point. (5) 3.3 Between which points on the graph is Phiwo resting? (4) 3.4 Determine from the graph the distance that Phiwo covers in the first 500 s. (3) 6G Between which two points is Phiwo running with non-uniform speed? (2) conrihtesoned NN A Fess u ove

Downloaded from hlayiso.com Physical Science/HG/P1 13 DBE/2012 SCE 3.6 Use information from the graph and equations of motion to calculate the magnitude of the acceleration for the points in QUESTION 3.5. 3.7 Calculate the speed with which Phiwo is running at point F. 3.8 Use the information from the graph to draw an accurate speed-time graph for the motion of Phiwo for the first 500 s. QUESTION 4 (START ON A NEW PAGE.) A system of two blocks, P of mass 20 kg and Q of unknown mass m kg are linked by a thin rope of negligible mass and accelerated over a rough horizontal surface as indicated in the diagram below. The frictional forces on P and Q are 2 N and 3 N respectively. The applied force on Q is 55 N. The system accelerates to the right at 1m.s™. li Q 20 kg u m kg 55 N + +» 4.1 State, in words, Newton's Second Law of motion. 4.2 Draw separate labelled force diagrams indicating only all the horizontal forces acting on P and Q. 4.3 Calculate T (the force in the rope linking the blocks). 4.4 Calculate the mass of block Q. QUESTION 5 [START ON A NEW PAGE.] A man of mass 80 kg wearing a seat belt, is driving a car which collides with the back of a stationary truck causing the car to be brought to rest in 0,2 s. At the instant of the collision the car is travelling at 20 m.s™. 5.1 Calculate the average force exerted by the seat belt on the man. The front ends of many modern cars are deliberately designed to crumple in a head-on collision. 5.2 Briefly explain why it is desirable that the front ends of a car should crumple in a head-on collision. Support your answer by means of a relevant equation. Conrintesoned JNA 0 0 A Peet rer (5) (6) [31] (5) (4) (4) [16] (5) (4) 19]

Downloaded from hlayiso.com Physical Science/HG/P1 14 DBE/2012 SCE QUESTION 6 [START ON A NEW PAGE.] An object of mass m rests at the surface of a planet of mass M. 6.1 State the law in words that describes the force that the object of mass m and the planet of mass M mutually exert on each other. (3) 6.2 Use TWO relevant equations to show that the gravitational acceleration, g, is independent of the mass of the object. (4) 6.3 The mass of the earth is approximately 80 times the mass of the planet. The radius of the earth is 4 times the radius of the planet. Show that g at the planet's surface is about z that of the value of g on earth. (3) [10] QUESTION 7 [START ON A NEW PAGE.] The diagram below represents a frictionless track. W and X are points on the horizontal section of the track. Vv 1,2m w N xX A block M of mass 0,40 kg is stationary at point V while a second block N, with mass 0,50 kg, is stationary at point X. Point V is 1,20 m higher than the horizontal section of the track. Ignore the effects of air resistance on the blocks. The block at V is released from rest. 7.1 Calculate the speed of the block when it reaches point W. (4) The first block collides with the second stationary block at point X. The two blocks stick together and move together after the collision. 7 Calculate the speed of the combined blocks immediately after the collision. (5) 7.3 Calculate the amount of energy that was lost during the collision. (6) [15] Cort mse Na ciniad

Downloaded from hlayiso.com Physical Science/HG/P1 15 DBE/2012 SCE QUESTION 8 [START ON A NEW PAGE.] Two identical, very small charged spheres, A and B, on isolated stands are placed a distance x m apart as indicated in the diagram. The charge on sphere A is +4x10% C while the magnitude of the charge on sphere B is 2x10° C. 2 xm | A B A exerts a force of F on B. 8.1 State, in words, Coulomb's law. (3) The following diagram illustrates the electric field pattern around sphere B. 8.2 ls sphere B positively or negatively charged? Explain your answer. (3) The charged spheres A and B are allowed to touch and are then moved back to their original positions x m apart. 8.3 Calculate the new charge on sphere A. (3) 8.4 When the charged spheres touch there is a flow of electrons from one to the other. 8.4.1 Which charged sphere receives electrons? Give a reason for your (3) answer. 8.4.2 Calculate the number of electrons transferred. (3) [15] Cony reed ANA AA Peet ovr

Downloaded from hlayiso.com Physical Science/HG/P1 16 DBE/2012 SCE QUESTION 9 [START ON A NEW PAGE.] The battery in the following circuit has an emf of 24 V and an internal resistance of 1,5Q. l ] M4 Ss; NY S2 R is a resistor with unknown resistance. The light bulb has a resistance of 15 Q. The resistance of the switches, S;, and S2, ammeter and conducting wires can be ignored. 9.1 State Ohm's law in words. (3) 9.2 What is meant by internal resistance of the battery? (2) 9.3 Calculate the effective resistance of the 10 © resistor and light bulb. (4) When the switch S; is closed, the bulb converts 576 J of energy per minute. 9.4 Calculate the reading on voltmeter V2 when the switch is closed. (5) 9.5 Calculate the reading on the ammeter. (4) 9.6 Determine the resistance of resistor R. (6) 7 Briefly explain what will happen to the reading on voltmeter V; when switch S2 is opened. (4) [28] TOTAL QUESTION 1: 60 TOTAL QUESTIONS 2-9: 140 GRAND TOTAL: 200 Coprihesoned NA

Downloaded from hlayiso.com Physical Science/HG/P1 1 DBE/2012 SCE DATA FOR PHYSICAL SCIENCE PAPER | (PHYSICS) TABLE 1: PHYSICAL CONSTANTS NAME SYMBOL VALUE Acceleration due to gravity g 10 ms? Gravitational constant G 6,7 x 10° N.m?.kg? Charge on electron e -1,6 x 10°C MATHEMATICAL AIDS B a c A Cc b sinA _ sinB _ sinC a b c c? = a? + b* - 2abcosC Copyright reserved FEO UTA UA AT Please turn over

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Downloaded from hlayiso.com Physical Science/HG/P1 2 SCE DBE/2012 TABLE 2: FORMULAE MOTION v =u+at an " = = a | 2 a N v? = u? +2as n u a c No} + < = om FORCE Fres = ma p= mv . Gm m, r2 F F At = Ap = mv-mu WORK, ENERGY AND POWER W = Fs Ep = mgh P= Ww Ex = a2 t 2 ELECTROSTATICS Ww Fx KQiQ, (k=9x10°N.m2.c*%) |V = — r? Q F E=— W = QEs q es (k=9x10°N.m2.C?) |E = A r? d CURRENT ELECTRICITY Q= It emf = I(R+r) R=nmtnmtist.. F = eee (k=2x 107 N.A®) 1°11 «1 vt = +++ = Vit = ?Rt = — Ron th % W = Vit =PRt= R Vv 2 Mol P=VizPR = R Copyright reserved GAUTENG

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Downloaded from hlayiso.com Physical Science/HG/P1 DBE/2012 SCE ANSWER SHEET CENTRE NUMBER: LT | Hanan EXAMINATION NUMBER: |__| ] eel 14 A B Cc D 42 A B Cc D 13 A B Cc D 14 A B Cc D 15 A B Cc D 16 A B Cc D 17 A B c D 18 A B Cc D 19 A B Cc D 440 A B Cc D For the use of the marker : Marks obtained A B Cc D Marker's 1.11 initials Marker's qd 12 - [ c 2 number me Ie Ee Le 1.14 A B Cc D 115 [4A 7 Cc 2 (15 x 4) [60] Copyright reserved NAN