f4 phy selaras2 09

8/8/2019 f4 phy selaras2 09

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The following information may be useful. The symbols have their usual meaning.

1.

2.

3.

4.

5. Momentum,

6.

7.

8.

9.

10.

11.

12.

13.

14.

x 100%

15.


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Section A. Answer all questions.

1 The following are three readings, P, Q and R obtained by three different measuringinstruments.

What measuring instrument was used to measure P, Q and R?

P Q R

A Vernier calliper Micrometer screw gauge Metre ruleB Micrometer screw gauge Vernier calliper Metre ruleC Micrometer screw gauge Metre rule Vernier calliperD Vernier calliper Metre rule Metre rule

2 Which speed - time graph applies to an object at rest?

3 Based on the graph in Diagram 1, the value of gradient is 2.0.

Diagram 1What is the unit for the gradient?

A m-1 s-1B m s-2C m s-1D m s2

v/ ms-1

t/s

10 -

5

P = 1.15 mmQ = 18.9 cm

R = 4.21 cm


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4 Diagram 3 shows a method of determining the resultant of two forces by using theparallelogram of forces.

Diagram 3Which of the followings represents the resultant force?

A OP

B OQC ORD PR

5 F1, F2 and F3 are forces with the same magnitude acting on a wooden block. Whichdiagram shows the maximum resultant force acting on a wooden block?

6 The forces are in equilibrium in all the phenomena below except

A a car descending a hill at constant velocityB a lamp hanging at rest in a hallC a mango falling from a treeD a ship floating at rest in the sea

P

RO

Q


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7 Which situation shows no work being done?


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8 Diagram 5 shows a stroboscopic photograph of a ball dropped from a height.

Which physics quantity remains constant as the ball falls?

A VelocityB MomentumC AccelerationD Kinetic energy

9 A brick falls from a height of 10 m. Calculate the time taken for the brick to reach the

ground.

A 0.5 sB 0.7 sC 1.0 sD 1.4 s

10 Table 1 shows the results of an experiment to investigate the relationship betweenload and extension when a spring is stretched.

Load F/N 100 150 200 250 300

Extension

x/cm

1.0 1.5 2.0 2.5 3.0

Table 1

The original length of spring is lo = 15.o cm. What is the manipulated variable?

A Load, FB Extension, xC Original length of the spring, loD Material used to make the spring


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13 Diagrams 3 shows a metal sphere oscillating on a frictionless track.

Which of the following statements is true?

A The kinetic energy of the metal sphere is minimum at RB The potential energy of the metal sphere is maximum at PC The principle of conservation of energy is not obeyedD The total energy of the metal sphere at S is higher than at R

14 The diagram shows load M supported by the arrangement of springs, P, Q and R. All thesprings are identical.

Which comparison is correct about the extension of P, Q and R

A P < Q < R C R < Q < PB Q < R < P D Q < P < R


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15 Diagram 1 shows a weightlifter successfully lifting a load of 60 kg.

Calculate the work done in lifting the load

A 30 JB 120 JC 600 JD 1200 J

Please write your answer in the space provided below :

1. 2. 3. 4. 5.

6. 7. 8. 9. 10.

11. 12. 13. 14. 15.


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Section B. Answer all questions.

1. Diagram 1.1 and Diagram 1.2 show two identical mirrors which are hang on the wallusing strings, of the same length.

DIAGRAM 1.1 DIAGRAM 1.2

The two mirrors are in equilibrium state. Each mirror has a mass of 2kg. Each string can withstand a maximum force of 15N.

(a) What is meant by equilibrium state?

.[1 mark]

(b)What is the weight of any one of the mirrors?

...[1 mark]

(c )In the space below, draw a diagram of a triangle of forces that acts onthe mirrors in Diagram 1.1 and Diagram 1.2

Diagram of a triangle of forces Diagram of a triangle of forcesFor Diagram 1.1 For Diagram 1.2


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(d)T1 and T2 are the tensions of the string that act on the mirrors in Diagram 1.1 andDiagram 1.2 respectively.(i) In the space below, draw the scale drawings of triangles of forces to determine thevalues of T1 and T2

[ Use the scale 1 cm : 2N]

T1 = .cm

= N

T2 = .cm

= N

[4marks]

(ii)Based on your answer in 1(d)(i), which is the most suitable method to hang the mirror? Giveone reason for your answer.

..

[2 marks]

(iii) If the string in Diagram 1.1 is cut, the mirror will fall down in 0.6 s.Calculate the final velocity of the mirror before it touches the surface of the floor.

[2 marks]


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2 Diagram 2.1 shows two boys pushing a large box. After some time, the box stillremains stationary.

Diagram 2.1

Diagra m 2.2 shows an airc raft mov ing forwa rd with a uniform veloc ity at a constantheight.

Diagram 2.2

Based on the situation in Diagram 2.1 and the situation in Diagram 2.2,

(a)(i) state similarities about the magnitudes and directions of the forces

FI and F2 , F 3 and F 4 .

Magnitudes.

Directions.

[2 marks]

(ii) What is the net force in both situations?

.[1 mark]

(iii) Based on the answers in 2(a)(i) and 2(a)(ii), name the physics concept involved.

..[1 mark]


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(b) (i) Another aircraft has F3 greater than F4. Describe the motion of this aircraft.

..[1 mark]

Explain the answer in 2(b)(i).

[2 mark]

3 The figures below shows the arrangement of apparatus in an experiment todetermine the relationship between the extension, e of a spring T with weight, W. Therelationship ofe and Wis shown in the graph.

a) Based on the graph,

i. Mark with a cross (x) the elastic limit of the spring. [1 mark]

ii. Name the law that is related to the graph before the elastic limit is exceeded.

[1 mark]iii. State the relationship between W and e before the elastic limit.

[1 mark]


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b) The spring stores energy when it is extended.

i) Name the type of energy stored in the spring.

[1 mark]

ii) Calculate the force constant of the spring in SI unit.

[1 mark]iii) Calculate the energy stored in the spring when it is extended by 4 cm.

[1 mark]iv) What is the relationship between area under the graph and the energy

stores in the spring.

[1 mark]


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c) Another spring T is added parallel with the spring T as shown in the figure below.

Sketch the graph of W against e for this experiment on the graph.[1 mark]

END OF THE QUESTIONS. GOOD LUCK!

Prepared by, Verified by,

....................... .........................

(Cik Marzeha Bt Zamzuri) (En.Zaidie B. Chee Din)

Science Teacher, Senior Science Teacher,

SMKA Kerian SMKA Kerian

Spring T

Spring T

f4 phy selaras2 09

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