NATIONAL SENIOR CERTIFICATE GRADE 11
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1 NTIONL SENIOR ERTIFITE GRE 11 PHYSIL SIENES: PHYSIS (P1) NOVEMER 017 MRKS: 150 TIME: 3 hours This question paper consists of 15 pages, data sheets and 1 answer sheet.
2 Physical Sciences/P1 E/November 017 INSTRUTIONS N INFORMTION Write your name and class (for example 11) in the appropriate spaces on the NSWER OOK. This question paper consists of TEN questions. nswer LL the questions in the NSWER OOK, except QUESTION 3.3 which has to be answered on the attached NSWER SHEET. Hand in the NSWER SHEET together with the NSWER OOK. Start EH question on a NEW page in the NSWER OOK. Number the answers correctly according to the numbering system used in this question paper. Leave ONE line between two subquestions, for example between QUESTION.1 and QUESTION.. You may use a non-programmable calculator. You may use appropriate mathematical instruments. You are advised to use the attached T SHEETS. Show LL formulae and substitutions in LL calculations. Round off your final numerical answers to a minimum of TWO decimal places. Give brief motivations, discussions et cetera where required. Write neatly and legibly.
3 Physical Sciences/P1 3 E/November 017 QUESTION 1: MULTIPLE-HOIE QUESTIONS Various options are provided as possible answers to the following questions. Each question has only ONE correct answer. hoose the answer and write only the letter ( ) next to the question number ( ) in the NSWER OOK, for example 1.11 E. 1.1 Which ONE of the following pairs of physical quantities is vector quantities? Force and distance Velocity and speed harge and electric field Electric field and force () 1. Which ONE of the following vector diagrams represents three forces acting on an object simultaneously while the object moves at ONSTNT VELOITY? ()
4 Physical Sciences/P1 4 E/November block with a mass of 4 kg is pulled upwards along a frictionless slope, inclined at an angle θ, with a force F, as shown in the sketch below. 4 kg F θ Which ONE of the following equations can be used to calculate the magnitude of the normal force (N)? N = (4)(9,8)sinθ N = F - (4)(9,8)cosθ N = F + (4)(9,8)cosθ N = (4)(9,8)cosθ () 1.4 satellite orbits Earth at a height where the gravitational force is a quarter (¼) of the force it experiences on the surface of the Earth. If the radius of Earth is R, the height of the satellite OVE THE SURFE of Earth is 4R R R ½R () 1.5 light ray passes from glass to air. The angle of incidence is 35. The critical angle of glass is 38. The light ray will undergo diffraction. refraction and bend away from the normal. total internal reflection. refraction and bend towards the normal. ()
5 Physical Sciences/P1 5 E/November The path of a light ray passing from air through a rectangular Perspex block is shown below. 39 Perspex θ The magnitude of angle θ will be less than 39. equal to 39. equal to 51. equal to 90. () 1.7 monochromatic red light ray passes through a single slit of width d. The diffraction pattern is projected on a screen. The red light is then replaced with monochromatic blue light and passed through the same single slit. The degree of diffraction will increase because the degree of diffraction is directly proportional to wavelength. decrease because blue light has a shorter wavelength than red light. increase because blue light has a longer wavelength than red light. decrease because the degree of diffraction is inversely proportional to wavelength. ()
6 Physical Sciences/P1 6 E/November negative charge of 1 µ, which is free to move, is placed at a distance r from a positive charge of 4 µ. +4 µ -1 µ + - l l l r r Which ONE of the following statements regarding the -1 µ charge, when it is at distance r, is ORRET? The electrostatic force experienced by the -1 µ charge will remain the same. be halved. be doubled. increase four times. () 1.9 circular coil is placed inside a magnetic field and rotated clockwise to induce an emf. Which ONE of the following changes will increase the induced emf? Rotating the coil slower ecreasing the number of turns/windings of the coil Increasing the speed of rotation of the coil hanging the polarity of the magnets ()
7 Physical Sciences/P1 7 E/November In the circuit diagram below, the battery has negligible internal resistance. The resistance of the ammeter and wires may also be ignored. V 1 4 Ω V 8 Ω 8 Ω V 3 The reading on voltmeter V 3 will be equal to V 1 ½ V 1 V 1 + V V - V 1 () [0]
8 Physical Sciences/P1 8 E/November 017 QUESTION (Start on a new page.) lock, which is at rest on a horizontal rough surface, is used as an anchor to hold block, with a mass of 56 kg, in the air at a certain height above the ground. The two blocks are connected with rope R, which makes an angle of 35 with the vertical. lock is suspended from the ceiling with cable. Refer to the diagram below. θ 56 kg 35 R lock experiences a frictional force of magnitude 00 N. The system is stationary..1 efine the term resultant vector. (). What is the magnitude of the resultant force acting on block? (1).3 raw a labelled free-body diagram indicating all the forces acting on block. (3).4 etermine the horizontal component of the force in rope R. (1).5 alculate the vertical component of the force in cable. (4).6 alculate the angle θ between the cable and the ceiling. () [13]
9 Physical Sciences/P1 9 E/November 017 QUESTION 3 (Start on a new page.) Learners investigate the relationship between net force and acceleration by pulling a trolley across a surface which is slightly inclined to compensate for friction. The trolley is connected to different masses by a string of negligible mass. The string passes over a frictionless pulley. Refer to the diagram below. trolley tape mass ticker-timer Ticker-tape attached to the trolley passes through the ticker-timer. The acceleration of the trolley is determined by analysing the ticker-tape. The results of the net force produced by the different masses and the acceleration of the trolley were recorded in the table below. NET FORE (N) a (m s - ) 0,3 0,36 0,6 0,73 0,9 1,09 1, 1, Write down a hypothesis for this experiment. () Identify the independent variable. Identify the controlled variable. (1) (1) 3.3 Use the graph paper on the NSWER SHEET and draw a graph of the acceleration versus net force. (4) 3.4 alculate the gradient of the graph. (3) 3.5 Use the gradient of the graph calculated in QUESTION 3.4 to determine the mass of the trolley. () [13]
10 Physical Sciences/P1 10 E/November 017 QUESTION 4 (Start on a new page.) tow truck pulls a car along a gravel road. The force applied by the engine of the tow truck is N. The mass of the tow truck is kg and the mass of the car is 950 kg. The vehicles are connected to each other by an inelastic tow bar of negligible mass. See the diagram below N Tow truck kg T ar 950 kg The tow truck and car move at a ONSTNT VELOITY. 4.1 efine the term frictional force. () 4. NME N STTE the law that explains why the force exerted by the tow truck on the car is the same as the force exerted by the car on the tow truck. (3) 4.3 raw a labelled free-body diagram indicating all the forces acting on the tow truck. (5) 4.4 If the coefficient of kinetic friction between the tow-truck tyres and the road surface is 0,45, calculate the: Magnitude of the tension in the tow bar (5) 4.4. oefficient of kinetic friction between the R tyres and the road surface (5) Suddenly the tow bar between the car and the tow truck disconnects and the car comes loose. 4.5 Using a relevant law of motion, explain why the car continues moving forward for a short distance. (3) 4.6 alculate the acceleration of the car as it comes to a stop after a short distance. (3) [6]
11 Physical Sciences/P1 11 E/November 017 QUESTION 5 (Start on a new page.) The acceleration due to gravity on planet X is,7 m s -. The radius of this planet is a third (⅓) of the radius of Earth. 5.1 Explain the difference between weight and mass. () 5. alculate the mass of planet X. (4) 5.3 etermine the factor by which the weight of an object on planet X will differ from the weight of the same object on Earth. () [8] QUESTION 6 (Start on a new page.) Experiments are performed to compare the refractive indices of different materials. In one experiment a light ray passes from air to material and the angles of incidence and refraction are measured. The refractive index for air is 1. The graph below was drawn using the results of material. sin θ r 0,37 0 0,56 sin θ i 6.1 efine the term angle of incidence. () 6. alculate the refractive index of material using the data in the graph. (3) 6.3 alculate the speed of the light through material. (3) 6.4 If material is replaced by material, the angle of refraction is 31 when the angle of incidence is alculate the refractive index of material. (4) 6.4. Redraw the graph of material, and on the same set of axis, draw the graph you expect for material. Label the graphs of material and material clearly. ()
12 Physical Sciences/P1 1 E/November Total internal reflection occurs when a light ray passes from material to material. The critical angle of material is Which range of angles will make it possible for total internal reflection to occur? () 6.5. What OTHER condition is necessary for total internal reflection to take place? () [18] QUESTION 7 (Start on a new page.) n experiment is set up, as shown below, to investigate the effect of slit width on the degree of diffraction. istance y on the diagram represents the distance between the screen and the single slit. istance x on the diagram represents the width of the central bright band. screen x y single slit Light source 7.1 Write down an investigative question for this experiment. () 7. State Huygens' principle in words. () 7.3 How will distance x be affected if the slit width is increased? hoose from INRESE, ERESE or REMIN THE SME. (1) 7.4 Explain the answer to QUESTION 7.3. () 7.5 How will distance x be affected if distance y is increased? hoose from INRESE, ERESE or REMIN THE SME. (1) [8]
13 Physical Sciences/P1 13 E/November 017 QUESTION 8 (Start on a new page.) Two IENTIL point charges, X and Y, are placed mm apart. Point P is 3 mm to the right of charge Y. The net electric field at point P is 5, N -1 to the left. X Y P mm 3 mm 8.1 efine the term electric field at a point. () 8. re the charges NEGTIVE or POSITIVE? (1) 8.3 raw the resultant electric field pattern for charges X and Y. (3) 8.4 alculate the magnitude of the charge X. (5) 8.5 harge Y is now replaced by an identical oppositely charged point charge. How will the magnitude of the net electric field at point P be affected? hoose from INRESE, ERESE or REMIN THE SME. Give a reason for the answer. () [13]
14 Physical Sciences/P1 14 E/November 017 QUESTION 9 (Start on a new page.) n induction coil of area 48,6 cm and 00 windings is rotated clockwise in a constant magnetic field of magnitude,4 T. Refer to the diagram below. θ S N The graph below shows how the induced emf varies with the inverse of time. ε (V) t 9.1 State Faraday's law in words. () 9. Use the information in the graph to calculate the change in magnetic flux. (5) 9.3 The coil rotates through an angle θ to a position where the magnetic flux becomes zero. alculate angle θ. (4) [11]
15 Physical Sciences/P1 15 E/November 017 QUESTION 10 (Start on a new page.) 10.1 The circuit below consists of a 6 Ω and 15 Ω resistor connected in parallel and an unknown resistor R, in series. n ammeter, a high-resistance voltmeter, a closed switch and battery are connected, as shown. The resistance of the battery and wires can be ignored. R V 6 Ω 15 Ω The total power dissipated in the parallel part of the circuit is 50 W efine the term power. () alculate the effective resistance of the parallel combination. () alculate the potential difference across the resistors in parallel. (3) alculate the current through resistor R. (3) The switch in the circuit is now OPENE How will the reading on the voltmeter (V) be influenced? hoose from INRESE, ERESE or REMIN THE SME. (1) Explain the answer to QUESTION (3) 10. geyser, labelled 000 W, is used for an average of 5 hours per day. The cost of electricity is 80 cents per kwh alculate the energy used by the geyser for 5 hours per day. (4) 10.. alculate the cost of electricity to operate the geyser for a month with 30 days. () [0] TOTL: 150
16 Physical Sciences/P1 1 E/November 017 T FOR PHYSIL SIENES GRE 11 PPER 1 (PHYSIS) GEGEWENS VIR FISIESE WETENSKPPE GR 11 VRESTEL 1 (FISIK) TLE 1: PHYSIL ONSTNTS/TEL 1: FISIESE KONSTNTES NME/NM SYMOL/SIMOOL VLUE/WRE cceleration due to gravity Swaartekragversnelling g 9,8 m s - Gravitational constant Swaartekragkonstante G 6,67 x N m kg - Radius of Earth Straal van arde R E 6,38 x 10 6 m oulomb's constant oulomb se konstante k 9,0 x N m Speed of light in a vacuum Spoed van lig in 'n vakuum c 3,0 x 10 8 m s -1 harge on electron Lading op elektron e -1,6 x Electron mass Elektronmassa m e 9,11 x kg Mass of the earth Massa van die arde M 5,98 x 10 4 kg TLE : FORMULE/TEL : FORMULES MOTION/EWEGING v v f f 1 = v i + a t x = v i t + a t v f + v i = v i + a x x = t FORE/KRG F net = ma w = mg Gm1m F= r µ = f k k N µ = s f s(max) N
17 Physical Sciences/P1 E/November 017 WVES, SOUN N LIGHT/GOLWE, KLNK EN LIG v = f λ n i sin θ i = n r sin θ r 1 T = f c n = v ELETROSTTIS/ELEKTROSTTIK kq Q 1 F = (k = 9,0 x 10 9 N m - ) r kq E = (k = 9,0 x 10 9 N m - ) r F E = q Q n = e ELETROMGNETISM/ELEKTROMGNETISME Φ ε = N Φ = cos θ t ELETRI IRUITS/ELEKTRIESE STROOMNE I = 1 R Q t V R = I = R= r1 + r + r r r r 1 W = Vq W = VI t W= I R t W= V Δt R 3 W P = Δt P = VI P = I R V P = R
18 Physical Sciences/P1 E/November 017 NSWER SHEET HN IN THIS NSWER SHEET TOGETHER WITH THE NSWER OOK. NME: LSS: QUESTION 3.3 a (m s-) Graph of acceleration versus net force F (N)
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