fizik midyear p2-f4

8/6/2019 Fizik Midyear p2-f4

1/11

fof-st tf Pf"/yttcs (Cnetp J) - rn tD f A-P rott * r4lv$6:,5{ sct+u c"; To greuent fhe r"tter 0um erer+ing too ffi.'rcfi fress..rre ofl

*l'le gtil on l-he obirct must nof be e+c44ce er(ess;ve -.dff+.t lhe arcurclcy u{ lhe tt*"ting(b) :ero err6r : gosi{irre Jro rro(' -

(c)Dreaoling (b)' 4,oo nm -f: h'f6 tnYn

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2/11

(d) Vloq ty : .'-ll= g:hlss -i= ly:ll me

Decrpos;63 veloci{3 / Cooslaq* deterercrtiontq)(n,lc)

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-1= 90 'Qt cms.=--=:--"!: 8c.,.2-o'.)>lV - 36'36clns

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se.36 * 9o'Qt(t-i)r o'::Q: * 54,55Q:

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3/11

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4/11

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5/11

CONFIDENTIALV, ms Gr..ph ,{ \ otu.ior{ +

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6/11

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7/11

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8/11

18 (a) (il 90 km h-1 or 25 m s-r

Vehicles with big mass and traveling with excessivehhigh speed will move e-ith a very high inertia ormomentum.Such high inertia r,r'ill make the vehicles very difficultto control and difficult to stop in short distances,resulting collision *'ith other vehicles.During a collision, a big force sill be imparted tocause great damages to vehicles and serious injuriesto the people in the vehicles.Number of tyres per wheel should be trr o.--r This will reduce the pressure on each ofthe tyzesand the combined width of the t1'res wili increasethe stability ofthe truck.The number of tanks should be five-+ This will reduce the mass of the oil per tank andits inertia.--+ Thus during braking or collision, the forceimparted to the walls of the tank will be less.This will reduce the risk of damage or leakage.The distance between the trailer and the tractorshould be further apart-+ In case of collision or accidents, there is a longerbuffer region for the trailer to move before hittingthe tractor. This will increase the safety of thedriver and his assistant-Brakes should be sersiced regularly.-+ This will ensure the brakes are always in goodconditions.--+ Thus the braking of the truck will be effective,

(ii)3000-1700=1300kg(iii) Maximum nomentum = B 000(r0,(,|..ffi0)

=75000Ns(b) (i) (3 000 + 800)u = 3 000(90) - 8Oo(110)velocity, u = 47.89 km h-r or 18.30 m s-t(ii) Force =ry@##@ = 70 176 N(c) 1

2

3

(d) 1

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9/11

SECTION C(a)Inference : The inertia ofthe swing depends on the mass ofthe object.(b) Ilypothesis : The bigger the mass, the larger the period.(c) (i) Aim : To investigate the relationship between mass and period.(ii) Variables :Manipulated - mass,m:Responding - period,T:Constant - stiffiress ofthe hacksaw blade(iii) List of apparatus and materials : hacksaw blade, G-clamp, stopwatch,plasticine balls of mass 20g,40g,609, 80 g and 1009, table.(iv) Arrangement of apparatus :

( i*;t tm-)( t,'4)( \w-)

C ir^1Ittr- )( tr;

I l,';llacksan'

Plasticin

(v) Procedure :-ry- Place a 20g plasticine ball on the free end ofthe hacksaw blade. Ciu^ )- Displace the free end of the hacksaw blade horizontally and release it to oscillate. Measure the r .time ior 20 oscillations, t using a stopwatch. Repeat theitep. Calculate the average time for 20 \ | t )oscillations. Determine the period using T :20 / "*-g" t- Repeat the experiment using mass +0g, 609, 80g and 1009. - Ctr,, )- Tabulate the result of m, t and T --Plot graph ofT against m 2 ( iv"l(vi) Tabulation of data :

llat: j g Tlrn3 for .10 os.lllntlonc {T} ./ s Tic \,\,\r t, I,,",'u.20-{it0 \r100

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10/11

QuestionSoalqn AnswerJawapan MarksMarkah

(c) (i)(iD

3. (a)(b)

(iiD

(iv)

(v)

State a suitable inferenceAcceleration is influenced by the mass IState a relevant hypothesisWhen the mass increased, the acceleration will be decreased. IState the aim of experimentTo investigate the relationship between the acceleration and the mass. IState the suitable manipulated variables and responding variable(Quantity that can be measured) LManipulatd variable: mass ,m l'Responding variable: acceleration , ct I

fuw,State the constant variableForce applied - f IState the complete list of apparatus and materials5 Trolleys, ticker timer, ticker tape, a rubber band, a wooden runway,12 V a.c power supply. IDraw the functional arrangement of the apparetus

Trolley rubber bandTicker L/Timer L/ricker tape /. I Zl--.._reW Friclion comnensat?d runwqy

"or,"r "rrrruI

State the method to control the manipulated variableThe apparatus is set up as shown in the diagram.The ticker-timer is switched on and a trolley is pulled using a rubberband. The extension ofthe rubber band is ensured to be ofthe samelength 1Sttte the method to metsure the responding variableAcceleration ofthe trolley is calculated using the ticker-tape.a:(v-u)/t IRepeat the experiment at least 4 times with the valuesProcedure 2 and Procedure 3 are repeated using2,3,4 and 5 trolleys.(Note : Based on SPM standard , at least five manipulated valuesrequired.) I

Skema Fizik 3


11/11

- Tabulate the results ofnumber oftrolley / mass andacceleration- Plot graph of acceleration against the number oftrolley / mass IState how the data tabulated with the title MV and RVMass / num. of trolley acceleration / cm s-rI

2J45

l:queErirybrtih"

State how the data is analysed, plot a graph RV against MVacceleration / cm s-'

Mass / num. of trolley

Total t4

Skena Fizik 3

fizik midyear p2-f4

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