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 STANDARD GRADE 2012 PHYSICAL SCIENCE SG: Paper 1 3042E MARKS: 150 AUTO uaraehot 30421E This question paper consists of 15 pages, 2 data sheets and 1 answer sheet. X@5 TIM Copyright reserved GAUTENG Please turn over

Downloaded from hlayiso.com Physical Science/SG/P1 2 DBE/2012 SCE INSTRUCTIONS AND INFORMATION 1. a F eo N Write your centre number and examination number in the appropriate spaces on the ANSWER BOOK. Answer ALL the questions. You may use a non-programmable calculator. You may use appropriate mathematical instruments. Data sheets are attached for your use. NOTE: The following circuit diagram symbols are used in this paper: Resistor: | instead of —/VWV\Y— Bulb: <<) instead of _qanap— You may forfeit marks if you do not follow instructions. Cony reser NAN Pease tum over

Downloaded from hlayiso.com Physical Science/SG/P1 3 DBE/2012 SCE QUESTION 1 INSTRUCTIONS ile 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. 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. 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. 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 ... ANSWER: A lB D [NOTE: when P21 Zea This layout may vary, depending on the type of ANSWER SHEET used by the province. ] Cont reseed JNA A Peas um ovr

Downloaded from hlayiso.com Physical Science/SG/P1 4 DBE/2012 SCE QUESTION 1 1.1. Two forces of magnitude 10 N and 6 N act on a box. The box lies on a 7 1.3 horizontal frictionless surface. 6N What must the angle 8 between the two forces be so that the resultant of the two forces is a maximum? sw B 60° C 120° D 180° (3) Which ONE of the following pairs consists of two vector quantities? A __ Time, acceleration B_ Velocity, displacement C Electric field strength, charge D Momentum, kinetic energy. (3) The diagram shows a soccer ball moving vertically upwards. & Which ONE of the following combinations of velocity and acceleration for the motion of the ball is correct? Ignore air friction. Velocity Acceleration A decreases remains constant B decreases decreases Cc remains constant remains constant D remains constant . decreases (3) Const reserved NAME A Paes trove

Downloaded from hlayiso.com Physical Science/SG/P1 5 DBE/2012 SCE . 1.4 The sketch below shows a car travelling to the right and slowing down in a 1.5 1.6 given time. res To the right > Which ONE of the following statements concerning the motion of the car is TRUE? A The velocity is to the right and the acceleration to the left. B The velocity and acceleration are both to the left. Cc The velocity and acceleration are both to the right D The velocity is to the left and the acceleration to the right. (3) In the equation of motion, v = u + at, the physical quantity and unit of measurement for the expression at is ... A displacement in m. B acceleration in m.s®. c velocity in m.s™. D. velocity in m?.s*. (3) A trolley is pulled along a horizontal surface by a constant resultant force. A piece of ticker tape is attached to the trolley and is pulled through a ticker timer. E, F, G and H represent consecutive dots on the ticker tape. E F G H e e e e Which ONE of the following statements is TRUE? The average velocity between E and F is equal to the instantaneous (actual) velocity at ... A E. B F. Cc half the distance between E and F. D half the time interval between E and F. (3) Canmore NA Peas tum ovr

Downloaded from hlayiso.com Physical Science/SG/P1 6 DBE/2012 SCE ots An object initially at rest experiences a constant resultant force. The object will ... A have a constant velocity in the direction of the resultant force. B experience an increase in velocity, in the direction of the resultant force. Cc have a constant momentum in the direction of the resultant force. D have a constant kinetic energy in the direction of the resultant force. (3) 1.8 A man pulls his friend in a cart on a rough horizontal surface as shown in the sketch below. The friend and the cart move at a constant velocity. Which ONE of the following quantities concerning the cart is zero for the above motion? A Gravitational force B Frictional force Cc Resultant force D Force applied by the man (3) 1.9 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 g B 2 Cc 2F D 4F (3) Cont esoved NAN Pease tum over

Downloaded from hlayiso.com Physical Science/SG/P1 7 DBE/2012 SCE 1.10 A car of mass m is moving at a constant velocity v. Which ONE of the following combinations for the momentum (p) and the kinetic energy (Ex) of the car is correct if the velocity of the car doubles? Momentum (p) Kinetic energy (Ex) A 4p 2Ex B 2p 4E, D 4p 4Ex, (3) 1.11 Two trolleys, X and Y, approach each other at an EQUAL speed and collide head on. Both trolleys immediately come to a stop after the collision. Before collision After collision —_ + Velocity zero Which ONE of the following statements regarding the two trolleys is FALSE? A The mass of trolley X is equal to the mass of trolley Y. B The total kinetic energy of trolley X and trolley Y does not change during the collision. Cc The total momentum of trolley X and trolley Y before the collision was zero. D The momentum of trolley X was equal but opposite in direction to the momentum of trolley Y before the collision. (3) icdiiiaaiiel CANIN U UAE A A Pease turn over

Downloaded from hlayiso.com Physical Science/SG/P1 8 DBE/2012 SCE 2 An electron is placed at point A, halfway between charged particles P and Q. Which ONE of the following statements is TRUE? —10 pC +10 pc @ . @ P A Q The electron will ... A remain at rest. B be accelerated towards P. Cc be accelerated towards Q. D move towards P at a constant velocity. (3) 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 Ge) Particle ) r 1 rt al 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 (3) Conese ANA NT Pose tum ove

Downloaded from hlayiso.com Physical Science/SG/P1 9 DBE/2012 SCE 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. L(A) Which ONE of the following combinations is CORRECT for the readings on the ammeter A and voltmeter V? Ammeter reading Voltmeter reading — A 2) 12V 3 B 2) 6V 3 Cc 41 I 12V 3 D {1 ' 6V (3) Conynteseved NAN 4 Peas tum ovr

Downloaded from hlayiso.com Physical Science/SG/P1 10 DBE/2012 SCE 1.15 In the experiment below, the effect on a current-carrying conductor in an external magnetic field is studied. The conventional current in the conductor is into the page as indicated by the X. P Noth} S @ Q | South R The conductor experiences a force, F. Which ONE of the following is the CORRECT direction of the force? Make use of the letters P, Q, RorS. Force direction A Towards P B Towards Q Cc Towards R D Towards S (3) (15x3) [45] cote A cid

Downloaded from hlayiso.com Physical Science/SG/P1 11 DBE/2012 SCE ANSWER QUESTIONS 2 TO 9 IN THE ANSWER BOOK. INSTRUCTIONS 1. Start EACH question on a NEW PAGE in the ANSWER BOOK. Z Leave a line between two subquestions, 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 light rope is attached to the side of a vertical wall at point X. A block of unknown mass is tied to the other end of the rope at Y. The block is pulled to one side by a horizontal force of 50 N, as indicated in the diagram and held there. The block is then in equilibrium while the angle between XY and the wall is 50° and the force in XY is 65 N. 50 N 2.1 Give a reason why the block is in equilibrium. (2) 2.2 Determine, by accurate construction and measurement, (1 cm represents 5 N) the magnitude and direction of the resultant of the 50 N force and the force in rope XY. Provide your construction with the necessary labels. (No marks will be given for a calculation.) (8) 2.3 Hence determine the unknown mass. (4) [14] Conn esoved JNA A Peas tum oer

Downloaded from hlayiso.com Physical Science/SG/P1 12 DBE/2012 SCE QUESTION 3 [START ON A NEW PAGE.] A cyclist starts from rest and acquires a velocity of 6 m.s" in 4s. 3.1 Calculate the magnitude of the acceleration of the cyclist. (4) The cyclist.maintains the velocity of 6 m.s’. He suddenly notices a tree trunk lying across the road 18 m ahead. However, he only applies the brakes of the bicycle 1 s after noticing the tree trunk. 3.2 Show by calculation that the cyclist will crash into the tree trunk if the bicycle decelerates at -1 m.s* once the brakes are applied. (8) During the collision with the tree trunk the cyclist is separated from the bicycle. It is observed that the cyclist lands on the other side of the tree trunk and the bicycle stops immediately as it gets stuck to the tree trunk. 3.3 Explain, using a law of motion of Newton, why the cyclist lands on the other side of the tree trunk. (3) [15] QUESTION 4 [START ON A NEW PAGE.] Thabo wants to determine the height of a bridge over the river that provides access to his village. He stands at the edge of the bridge and drops a stone from rest which reaches the water 1,5 s later. Ignore air resistance. 4.1 Calculate the height of the bridge. (4) 4.2 Calculate the speed with which the stone hits the water. (4) [8] Cop esoved ANA A Pease tum over

Downloaded from hlayiso.com Physical Science/SG/P1 13 DBE/2012 SCE QUESTION 5 [START ON A NEW PAGE.] Tom pulls Harry on a homemade cart to the left as shown in the diagram below. Harry and the cart have a total mass of 55 kg. Tom applies a horizontal force of 115 N and the cart accelerates at 2 m.s” to the left. Tom 5.1 State Newton's Second Law of motion in words. (3) 5.2 Calculate the frictional force experienced by the cart while being pulled by Tom. (7) [10] QUESTION 6 [START ON A NEW PAGE.] A boy of mass 50 kg, carrying a schoolbag of mass 10 kg, skates on a horizontal frictionless track to the right at a speed of 2 m.s™. He then throws his bag with a speed of 3 m.s” in the opposite direction to his motion. before 6.1 State the law of Conservation of Linear Momentum in words. (3) 6.2 Calculate the velocity of the boy immediately after he threw the bag. (6) [9] Cony reson NAN Pease tun oer

Downloaded from hlayiso.com Physical Science/SG/P1 14 DBE/2012 SCE QUESTION 7 [START ON A NEW PAGE.] The sketch shows the path of a pendulum bob of mass 150 g. The bob swings to a maximum height of 100 mm above the lowest level of its motion. Ignore friction. \ i 100 mm ao 7 What does the term mechanical energy of an object refer to? (2) 7.2 Determine the speed of the bob at the lowest level of its motion. (6) 7.3 Give a reason why it is incorrect to use the equation v’ = u* + 2as to determine the answer to QUESTION 7.2. (2) [10] QUESTION 8 [START ON A NEW PAGE.] Two identical metal spheres P and Q on insulated stands, carrying charges of —6x 10°C and + 3 x 10° C respectively, are initially 30 cm apart. 30cm} —6x10°C +3 x 10°C 8.1 Explain what is meant by saying P has a negative charge. (2) 8.2 State, in words, Coulomb's law. (3) 8.3 Draw the electric field pattern produced by the two charged spheres. (4) 8.4 Calculate the magnitude of the electrostatic force that the charges exert on each other. (6) 8.5 P and Q are moved towards each other and allowed to make contact. They are then separated and moved back to their original positions. Calculate the new charge on each sphere. (3) [18] eeprom esoves NN Pte

Downloaded from hlayiso.com Physical Science/SG/P1 15 DBE/2012 SCE QUESTION 9 [START ON A NEW PAGE.] In the circuit represented below, the battery and the ammeter have negligible resistance. Switch S is closed and the reading on the ammeter is 6 A. 6Q qs 137} [22 } 9.1 Calculate the effective resistance of the above combination of resistors. (5) 9.2 Calculate the reading on: 9.2.1 V; (the emf of the battery) (4) 9.2.2 V2 (6) The switch is now opened. 9.3 State whether the following would increase, decrease OR remain the same: 9.3.1 The reading on the voltmeter V; (2) 9.3.2 The reading on V2 (2) 9.3.3 The reading on the ammeter (2) [21] TOTAL QUESTION 1: 45 TOTAL QUESTIONS 2-9: 105 GRAND TOTAL: 150 Copyright reserved CAUTION ON AE A Pease turn over

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Downloaded from hlayiso.com Physical Science/SG/P1 DBE/2012 SCE DATA FOR PHYSICAL SCIENCE PAPER | (PHYSICS) TABLE 1: PHYSICAL CONSTANTS NAME SYMBOL VALUE Acceleration due to gravity g 10 m.s* Gravitational constant G 6,7 x 10°"! N.m2.kg Charge on electron e -1,6x 10°C MATHEMATICAL AIDS B a c A Cc b sinA _ sinB _ sinC a b (] c? = a + b? - 2abcosC Copriesoned AA UA

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Downloaded from hlayiso.com Physical Science/SG/P1 DBE/2012 SCE TABLE 2: FORMULAE MOTION Vv = u+at s = ut + —at? : u+v v? = u? +2as s = { }e 2 FORCE Fres = ma p= mv Gm,m Fe—7? F At = Ap = mv-mu r WORK, ENERGY AND POWER W = Fs E, = mgh p= E = mv? t 2 ELECTROSTATICS Ww F = KQ:Q2 (k=9x10°N.m2.C7) | V = — r2 Q F —Eet W = QEs q e= 'Q (k=9x10°Nm2c?) JE= ¥ : d CURRENT ELECTRICITY Q=It emffemk = I(R +r) R=mttoettgt... Fe a (k= 2x 107 NA) 1 a0 7 v"t See =ViIt=PRt= R hh mh Ee Vv 2 a. P =Vi=PR = R Con esoned A A

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Downloaded from hlayiso.com Physical Science/SG/P1 DBE/2012 SCE ANSWER SHEET CENTRE NUMBER: EXAMINATION NUMBER: | tf | t J] 7 A B Cc D 1.2 A B Cc D 1.3 A B Cc D 1.4 A B Cc D 1.5 A B Cc D 1.6 A B Cc D 1.7 A B Cc D 1.8 A B Cc D 1.9 A B Cc D For the use of the marker 1.11 A B Cc D Marks obtained 1.12 A B Cc D Marker's initials Marker's 1.13 A B c D number (15x3) [45] Copyright reserved FOI EU A TA