Physical Sciences Grade 10 P1 Gauteng June 2022 Memo (Eng)

Downloaded from hlayiso.com PROVINCIAL EXAMINATION JUNE 2022 GRADE 10 MARKING GUIDELINES PHYSICAL SCIENCES (PAPER 1) 6 pages

Downloaded from hlayiso.com PHYSICAL SCIENCES MARKING GUIDELINES (PAPER 1) GRADE 10 QUESTION 1 1.1 B ✓✓ 1.2 C ✓✓ 1.3 B ✓✓ 1.4 B ✓✓ 1.5 C ✓✓ 1.6 A ✓✓ 1.7 D ✓✓ 1.8 D ✓✓ (2 x 8) [16] QUESTION 2 2.1 2.1.1 Scalar is physical quantity with magnitude only. ✓✓ (2) 2.1.2 4,5 cm ✓ 6,75 cm ✓ R = 8,11 cm ✓ (3) 2.1.3 Fnet 2 = X 2 + Y 2 ✓ Fnet = (4,5) 2 + (6,75) 2 ✓✓ Fnet = 8,11 cm ✓ (4) 2.1.4 Yes ✓, the solution must be the same irrespective of method used.✓ (2) 2.2 2.2.1 Distance = 7,5 km ✓ (1) 2.2.2 Displacement = 4,5 – 3 = 1,5 km ✓, North ✓ (2) [14] 2

Downloaded from hlayiso.com PHYSICAL SCIENCES MARKING GUIDELINES (PAPER 1) GRADE 10 QUESTION 3 3.1 The total mechanical energy remains constant in an isolated system. ✓✓ OR The sum of gravitational potential energy and kinetic energy at the top equals the sum of gravitation potential energy and kinetic energy at the bottom in the absence of friction. ✓✓ (2) 3.2 Ep = m.g.h ✓ = 112 x 9,8 x 10 ✓ = 10 976 J ✓ (3) 3.3 EMtop = EMbottom ✓ m.g.h + .m.v2 = m.g.h + .m.V2 (112 x 9,8 x 10) + 0 ✓ = (112 x 9,8 x 8) + x 112 x V2 ✓ 10 976 = 8 780,8 + 56.V2 V = 6,26 m·s-1 ✓ (4) 3.4 EMtop = EMbottom ✓ m.g.h + .m.v2 = m.g.h + .m.V2 (112 x 9,8 x 10) + 0 ✓ = 0 + x 112 x V2 ✓ 10976 = 56·V2 V = 14 m·s-1 ✓ (4) 3.5 Remains the same. ✓ Total mechanical energy is conserved. No friction. ✓ (2) [15] 3

Downloaded from hlayiso.com PHYSICAL SCIENCES MARKING GUIDELINES (PAPER 1) GRADE 10 QUESTION 4 4.1 Every charge in the universe consists of integer multiple of the electron charge. ✓✓ (2) 4.2 n= ✓ n= ✓ = 5,125 x 1010 electrons ✓ (3) 4.3 Attraction force ✓ (1) 4.4.1 S to T ✓ (1) 4.4.2 The net charge of an isolated system remains constant during any physical process. ✓✓ (2) 4.4.3 QT + QS Q new = ✓ 2 ( +5,4  10 −9 ) + ( −8,2  10 −9 ) = ✓ 2 = − 1,4  10 −9 C ✓ (3) 4.5 Static electricity is formed much better when the air is dry or the humidity is low. When the air is humid, water molecules can collect on the surface of various materials. This can prevent the build-up of electrical charges. ✓✓ (2) [14] 4

Downloaded from hlayiso.com PHYSICAL SCIENCES MARKING GUIDELINES (PAPER 1) GRADE 10 QUESTION 5 5.1 Maximum energy given to each coulomb of charge passing through battery. ✓✓ (2) 5.2 Parallel ✓ (1) 5.3 5.3.1 ✓ 1 1 1 = + ✓ Rp 24 16 Rp = 9,6  ✓ (3) 5.3.2 V I= ✓ R 12 I= ✓ 9,6 I = 1,25 A✓ (3) 5.4 5.4.1 Rs = R1 + R2 Rs = 24 + 16 ✓ Rs = 40  ✓ (2) 5.4.2 V I= R 12 = ✓ 40 = 0,3 A ✓ (2) 5.5 Q I= ✓ Δt Q 0,3 = ✓ 120 Q = 36 C ✓ (3) 5.6 Circuit 1 ✓, connecting resistors in parallel decreases the total resistance of the circuit ✓, thus increasing the total current passing through the circuit/ increasing the brightness of the bulb. ✓ (3) [19] 5

Downloaded from hlayiso.com PHYSICAL SCIENCES MARKING GUIDELINES (PAPER 1) GRADE 10 QUESTION 6 6.1 Rate of change in velocity. OR Change in velocity per second. ✓✓ (2) 6.2 77 km .h −1  1 000 ✓ = 21,39 m·s-1 ✓ 3 600 (2) 6.3 V f = Vi + at ✓ V f = 0 + (1,5)(6,5) ✓✓ Vf = 9,75 m·s-1 ✓ (4) 6.4 X = Vi t + 1 2 at 2 ✓ X = (0)(6,5) + 1 2 (1,5)(6,5)2 ✓✓ X = 31,69 m ✓ (4) 6.5  V f + Vi  X =  t ✓  2   21,39 + 0  X =  (6,5) ✓✓  2  X = 69,52 m ✓ (4) 6.6 No, ✓ CAR A is moving with 2 times the speed of CAR B. ✓ (2) 6.7 X = Vi t + 1 2 at 2 ✓ 25 = (21,39 )(2,5) + 1 2 a(2,5) ✓✓ 2 a = −9,112 m.s −2 ✓ (Decelerating) (4) [22] TOTAL: 100 6