Physical Sciences Grade 11 P1 2018 QP & Memo

education Department: Education PROVINCE OF KWAZULU-NATAL NATIONAL SENIOR CERTIFICATE [ GRADE 11 | PAAAA ASANO EUS ROR EE EE Ee te PHYSICAL SCIENCES: PHYSICS (P1) COMMON TEST JUNE 2018 Con ett treere ere riere ere erer eee terri rie re eee rere errr rere e reer eer rrr rrr res TIME: 2 hours MARKS: 100 This question paper consists of 12 pages a data sheet, and a graph sheet for Question 2.5 Copyright reserved Please turn over

Downloaded from hlayiso.com Physical Sciences /P1 June 2018 Common Test NSC INSTRUCTIONS AND INFORMATION TO CANDIDATES 1. Write your name on the ANSWER BOOK. 2. This question paper consists of EIGHT 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 subsections, for example between QUESTION 2.1 and QUESTION 2.2. 6. You may use a non-programmable calculator 7. You may use appropriate mathematical instruments 8. You are advised to use the attached DATA SHEET. 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. 12. Remember to write your name on the graph sheet (Question 2.5), and hand this sheet together with your answer booklet. Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences /P1 June 2018 Common Test NSC QUESTION 1 Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Write only the letter (A - D) next to the question number (1.1 — 1.6) in the ANSWER BOOK, for example 1.7 D. 14 Three vectors X, Y and Z have magnitudes and directions as shown below. Which of the following statements is possible? A X+#Y¥+Z=0 B X=Y4+Z c Y=EX+Z D Z=Y+X (2) 1.2 Two bodies, A (mass m) and B (mass 2m) are at rest. They are accelerated in a straight line by identical forces F, across the same horizontal, frictionless surface. A F m }————_» B) 2m >» After moving a distance x, the velocity of A is v. What will be the velocity of B after it has moved the same distance x? A v B 2v Cc 4v D YWv (2) Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences /P June 2018 Common Test NSC 1.3 The diagrams below show an object of mass m moving on the same rough surface under the action of an applied force F. In which diagram will the magnitude of the frictional force not depend on force F? A B Ea a m Lo)_ F Vae=] M a sil Cc D 2" a awe © we ~o oS FS (2) 1.4 The gravitational force that the moon exerts on the earth is A attractive, and less than the force that the earth exerts on the moon. B repulsive, and less than the force that the earth exerts on the moon. Cc repulsive, and equal to the force that the earth exerts on the moon. D attractive, and equal to the force that the earth exerts on the moon. (2) 1.5 When a ray of light traveling in water reaches a boundary with air, part of the light ray is reflected and part is refracted. Which ray diagram best represents the paths of the reflected and refracted light rays? | B | c | D | A | | | | | | | | ; | i | F | | Air Air Air Air j Water Water \ Water | Water | | | | | | | | | Light | Light | Light | Light | ray Normal ray Normal ray Normal ray Normal (2) Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences /P1 June 2018 Common Tesi NSC 1.6 The core of an optical fibre has a A. Lower refractive index than air. B Lower refractive index than the cladding. C. Higher refractive index than the cladding. D Identical refractive index to that of the cladding. [12] QUESTION TWO The diagram below represents the force board experiment which was used by learners to determine the resultant of two co-planar forces. String C is attached *~ strings A and B at point O when the system is at rest. OX Ag) oyknot paper sheet , 2.1 Whatis the magnitude of the resultant force of the system? (1) 2.2. State the parallelogram law. (2) 2.3. Calculate the magnitudes of the force in string A. (2) 2.4. State TWO precautions a learner should observe when conducting this experiment. (2) The data obtained from their experiment was plotted on the attached graph sheet. Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences /P1 June 2018 Common Test NSC 2.5 Determine graphically, using the parallelogram law, the magnitude of the resultant force of the forces acting in strings A and B. Use the given scale (10 mm represents 1 N). (5) 2.6 What is the relationship between the resultant force and the force in string C? Write down only GREATER THAN, LESS THAN or EQUAL TO. (2) Explain your answer. [14] QUESTION THREE Two blocks of mass 3 kg and 5 kg respectively are in contact with each other during motion. The 3 kg block is glued onto the 5 kg block. An applied force F of magnitude 250 N acts on the 5 kg block at an angle of 60° with respect to the horizontal. The blocks move at a constant velocity of 10 m-s” to the right on a rough horizontal surface. F = 250N 3 kg 10 ms"! > 3.1 Define the term kinetic frictional force. (2) 3.2 Calculate the magnitude of the frictional force acting between the 5 kg block and the ground. (3) 3.3. Calculate px, the coefficient of kinetic friction between the 5 kg block and the surface. (5) A retarding force of 50 N is applied horizontally to the 5 kg block 3.4 Calculate the acceleration of the 5 kg block. (3) [13] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences /P1 ys June 2018 Common Test NSC QUESTION FOUR The sketch shows a block of mass 2 kg placed on a rough horizontal surface. This block is attached to an 8 kg mass by an inextensible cord that passes over a frictionless pulley. The frictional force between the surface and the 2 kg block is 10 N when the block is in motion. ——» 8 kg 4.1 Draw a labelled free body diagram showing all the forces acting on the 2 kg mass piece. (4) 4.2 Calculate: 4.2.1 the acceleration of the 8 kg mass. (5) 4.2.2 the tension in the cord. (2) 4.2.3 The distance the 2 kg mass would travel in 1,2 s if it starts from rest. Assume that the 2 kg block does not strike the pulley in 1,2s. (3) The cord attached to the masses breaks. 4.3. What is the magnitude of the acceleration of the 8 kg mass? (1) [15] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences /P1 June 2018 Common Test NSC QUESTION FIVE The graph below was obtained from an experiment to determine the relationship between the acceleration and a horizontal applied force on a dynamics trolley on a flat runaway. Acceleration vs Force TT Acceleration (ms) a Name and state the law that is being investigated above. (3) 5.2 Use the graph to determine 5.2.1. the mass of the trolley. (3) 5.2.2 the acceleration of the trolley when the applied force is zero. (4) [10] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences /Pi 9 June 2018 Common Test NSC QUESTION SIX 6.1 State Newton's Law of Universal Gravitation in words. (2) 6.2. An astronaut on the surface of the moon weighs an object of mass m. What would be the approximate weight of the same object on the surface of the earth if its weight on the moon is Wn? Write down your final answer in terms of Win Given: Mass of Earth = 81 Radius of Earth = 11 Mass of Moon Radius of Moon 3 [7] QUESTION SEVEN ¢.1 The diagram below shows light entering a glass block which is placed above a block of diamond. Use the table of refractive indices to answer the questions below air glass diamond Material air glass diamond Refractive Index | 1,00 1,58 2,42 7.1.1. Define “refraction of light *. (2) 7.1.2 Copy the diagram in your answer booklet. Complete the diagram by showing the path taken by the light ray as it passes from air to glass and then to diamond. Label the angle of incidence as the light passes from air to glass and draw the normal at each surface. (4) Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences /P1 10 June 2018 Common Test NSC 7.2. The surfaces of a plane mirror and a rectangular block of Perspex are at right angles to each other as shown in the diagram below. The refractive index of Perspex is 1,42 and the refractive index of air is 150: p77 Plane mirror , i iir Air \ W 1 Jo ey ‘y, Perspex 7.2.1 State Snell's law. (2) 7.2.2. The angle of refraction of a light ray is 18° in the Perspex. Calculate the angle of incidence of the light ray, i, at the surface of — (5) the mirror. 7.3 Aray of light strikes a glass-air interface and travels as shown in the diagram below. The refractive index of air (Nair ) is equal to 1 _— Glass-air Air \ | boundary Glass ~ 7.3.1 Determine the critical angle of glass. (1) 7.3.2 Calculate the refractive index of glass. (3) 7.3.3 Name the phenomenon that occurs when angle / exceeds the critical angle. (1) 7.3.4. State two conditions that are required for this phenomenon to (2) occur. [20] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences /P1 14 NSC QUESTION EIGHT June 2018 Common Test Monochromatic red light is shone through a narrow slit and a diffraction pattern is observed on a screen as shown below. Tet 8.1 Define monochromatic light. 8.2 State Huygens principle. 8.3 Describe the diffraction pattern which is observed on the screen. 8.4 Explain the formation of Y 8.5 Howwill the broadness of X differ if the following changes take place. Write down only BROADER, NARROWER or REMAINS THE SAME. 8.5.1 Monochromatic blue light is used 8.5.2 A narrower slit is used Copyright Reserved TOTAL : 100 Please Turn Over

Downloaded from hlayiso.com Physical Sciences /P1 12 NSC June 2018 Common Test DATA FOR PHYSICAL SCIENCES GRADE 11 PAPER 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 11 VRAESTEL 1 (FISIKA) TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE TABLE 2: FORMULAE/TABEL 2: FORMULES MOTION/BEWEGING v, =v, +aat Ax =v At+iaat? 2 2 ( Vy +V, \ Vv, =V, +2aAx Ax = a a FORCE/KRAG F,..=ma w=mg f. F= Gmim, uy =n i : N f, by “N WAVES ,SOUND AND LIGHT/GOLWE, KLANK EN LIG n,sin8,-n, sind, Copyright Reserved Please Turn Over

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