MELAKA-answer Physics P2-Trial SPM 2009

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Marking Scheme Paper 2 Physics Mid Year Melaka Form 5 2009 No 1(a) (b) (c) (d) Marking Scheme Rate of change of displacement The object stop Line AB Displacement / distance TOTAL A force is that which can cause an object with mass to change its velocity. Show the correct value of horizontal force Fx = 30 cos 60o N = 15 N Show the correct substitution W = F x S = 15 x 10 = 150 J Place tyre under the box //wax the moving surface TOTAL Kelvin , K To obtain two fix points high and low Opaque / easy
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  1Marking Scheme Paper 2 PhysicsMid Year Melaka Form 5 2009No Marking Scheme Mark 1(a) Rate of change of displacement 1(b) The object stop 1(c) Line AB 1(d) Displacement / distance 1TOTAL 42(a) A force is that which can cause an object with mass to change its velocity. 1(b) Show the correct value of horizontal forceF x = 30 cos 60 o N = 15 NShow the correct substitutionW = F x S = 15 x 10= 150 J111(c) Place tyre under the box //wax the moving surface 1TOTAL 53(a) Kelvin , K 1(b) To obtain two fix points high and low 1(c) Opaque / easy to see / does not stick 1(d) 20.0 cm. 11 st :2 nd : = 84.5 o C2TOTAL 64(a) 1(b)(i) 1 st Gravitational potential energy2 nd to kinetic energy2(b)(ii) 1 st : momentum = 6 x 42 nd : = 24 kg m s -1 2(c)(i) Thrown forward 1(c)(ii) Inertia of the wooden block 1TOTAL 75(a)(i) Same VolumeNet force zero11(ii) Y < X < Z 1(b)(i) Box Y floats and immersed partially / box X immersed fully and floats 1  2box Z sink 1(ii) Greater weight means greater mass and greater densityThe higher density object needs more volume to increase the buoyant forceto support the weight .11(c) Archimedes principle // equilibrium of forces 1TOTAL 86(a) Image cannot be captured on the screen 1(b)(i) Image in Diagram 6.1 is > then Diagram 6.2 1(b)(ii) Equal // same 1(b)(iii) Image distance in Diagram 6.1 is further // > than in Diagram 5.2 1(c) The shorter the image distance the smaller the image //directly proportional 1(d) 1(e)(i)(ii)blurnot enough light11TOTAL 87(a)(i) Reflection 1(a)(ii) Equal 1(b) It has high frequency / high energy 1(c)1 st :2 nd : s = 37.5 m2(d)(i) 1 st : At a higher place2 nd :Easier to receive the signal2(d)(ii) Microwave 1(d)(iii) 1 st : increase the diameter of the device2 nd : receive more signals2TOTAL 108(a)(i) A region where a charge experiences electrical forces 1(a)(ii)1 st : Draw shape correctly2 nd : Mark direction correctly11(b)(i) 1 st Q = It = 0.2 x 3 x 60 C2 nd : = 36 C11(b)(ii) 1 st : n = Q/e = 36/1.9 x 10 -19 = 1.89 x 10 20 1(c)(i) Extra high tensionProduce higher strength of magnetic field11(c)(ii) metalstrong / good conductor11(d) R 1  3(e) Non electrolyte 1TOTAL 129(a) Pascal’s principle states that pressure applied onto an enclosed liquid istransferred equally in all directions .19(b)1 st : The input forces are equal2 nd : Surface area in table 9.1 is higher than in table 9.23 rd : Output forces in table 9.1 is smaller than in table 9.24 th : The pressure transmitted equally in both pistons and in all directions.5 th : The pressure transmitted in table 9.1 is higher than in table 9.25(c) 1 st : When the piston is pushed, valve P will close while valve Q will open.The pressure is transmitted to the big piston and a big force isproduced.2 nd : When the piston is pulled up, valve P will open while valve Q willclose. This will transmit the hydraulic liquid in the chamber to thespace in the small cylinder.3 rd :When pushing and pulling is repeated, the load on the big piston israised by using a small effort.4 th :The load is lowered by pressing on the release valve which allows theflow of the hydraulic fluid back into the chamber.4(d) 1 st : the hydraulic brake fluid must not be compressible2 nd : the energy used to compress the brake fluid will make the brakesystem ineffective.3 rd : the hydraulic brake fluid must not evaporate easily4 th : so the user will not change the brake fluid frequently.5 th : example of brake fluid is oil6 th :Water cannot be used as a hydraulic brake fluid because water canevaporate easily and form water vapour bubbles.7 th : Air and water vapour can be compressed.8 th :Part of the force from the pressure is used to compress the watervapour. This will make the brake system ineffective.9 th :When the pedal is pressed, the pressure is transmitted through thehydraulic fluid to all the front and rear brakes.10 th : The surface area of the output piston is more than the surface area of the input system so that a big force is produced.11 th : The surface area of the pistons of the rear left and right brakes mustbe the same so that the pistons will produce the same force on thevehicles.12 th :The frictional forces between the brake shoe and the brake drum causethe vehicle to slow down or stop10TOTAL 2010(a) Sound wave is a longitudinal waves. 110(b)(i) 1 st : The diameter of guitar string in Diagram 10.1 is smaller than diameterof the string in Diagram 10.22 nd : The amplitude of the wave in Diagram 10.1 is the same as in Diagram10.23  43 rd : Number of oscillations in Diagram 10.1 is higher than in Diagram 10.210(b)(ii)When the diameter of the string increases , the frequency of the wavedecreases110(b)(iii)The higher the frequency , the higher the pitch of the sound 1(c) 1 st : When a tuning fork vibrates, air molecules will vibrate.2 nd : When the tuning fork moves forwards, the air is compressed.3 rd : When the tuning fork moves backwards, the air layers are pulled apartand cause a rarefraction.4 th : Therefore, a series of compression and rarefactions will produce sound.5 th : The sound energy is propagated through the air around it in the form of waves.4(d) 1 st : Large diameter2 nd : receives more signal3 rd :The distance of signal receiver from the centre of the parabolic disc issame as the focal length4 th :Radar gives out parallel beam//signals focused to the receiver5 th :Use microwave wave6 th :High energy7 th :Short wavelength8 th :Easily reflected9 th :High frequency10 th :High energy / can travel at longer distance11 th :The position of the parabolic disc is high12 th :The signal is not blocked //much coverage//can detect signal13 th :Strong material14 th :Not easily broken10TOTAL 2011(a) To control the current 111(b) Length of wire 111(c) 1 st : current flows from A to B through the slider2 nd : slider is moved to change the length of wire3 rd : length of wire is directly proportional to current311(d)Specification explanation1 st : Density of wire is small 2 nd : so it is lighter3 rd : Melting point is high 4 th : so the wire will not melt athigh temperature5 th : oxidation rate is low 6 th : the wire can be used for alonger time7 th : resistivity is high 8 th : more heat energy is producedThe best wire is M Because the density is small, melting point is high,oxidation rate is low and resistivity is high.10
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