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Paper 3

Zulaili Yaacob&

Mohamad Hussaini

SECTION A : Question 1

1(a)(i) Manipulated variable : ____________________

1(a)(ii) Responding variable : ____________________

1(a)(iii) Constant variable : ____________________

1

2

0

l

1

Figure 11.2 : Temperature, = 30 C

length, l = ………… cm

m.v

r.v

Temperature,

Length, l


1(a)(i) Manipulated variable : ____________________

1(a)(ii) Responding variable : ____________________

1(a)(iii) Constant variable : ____________________ (depends on the experiment)

MISTAK

ES!!!

Which of the following is possibly a constant variable?

A) Mass B) Thermometer C) Air

A) Water B) Stopwatch C) Time

A) Length B) Air column C) Ruler


1(b) Based on Figures 11.2, 11.3, 11.4, 11.5, and 11.6, determine l when is equal to 30 C, 35 C, 40 C, 45 C and 50 C.

Tabulate your results for l and V for each value of in the space below.

/ C l / cm V / cm3

30

35

40

45

50

SECTION A : Question 1 Spot the errors!

t1 t2 tmean T T2 l

17 17.6 17.3 0.87 0.76 20

22.4 22 22.2 1.11 1.23 30

25 24.6 24.8 1.24 1.54 40

28 28.8 28.4 1.42 2.02 50

30.8 31 30.9 1.55 2.4 60

No unit!

Not consistence!


Unit at the wrong place!

l t1 t2 tmean T T2

20.0 cm 17.0 s 17.6 s 17.3 s 0.87 s 0.76 s2

30.0 cm 22.4 s 22.0 s 22.2 s 1.11 s 1.23 s2

40.0 cm 25.0 s 24.6 s 24.8 s 1.24 s 1.54 s2

50.0 cm 28.0 s 28.8 s 28.4 s 1.42 s 2.02 s2

60.0 cm 30.8 s 31.0 s 30.9 s 1.55 s 2.40 s2


Wrong unit!

Not consistence!

l/ cm t1 / s t2 / s tmean / s T / s T2 / s

20.0 17.0 17.6 17.3 0.865 0.748

30.0 22.4 22.0 22.2 1.11 1.232

40.0 25.0 24.6 24.8 1.24 1.537

50.0 28.0 28.8 28.4 1.42 2.016

60.0 30.8 31.0 30.9 1.545 2.387


No error!

l/ cm t1 / s t2 / s tmean / s T / s T2 / s2

20.0 17.0 17.6 17.3 0.87 0.76

30.0 22.4 22.0 22.2 1.11 1.23

40.0 25.0 24.6 24.8 1.24 1.54

50.0 28.0 28.8 28.4 1.42 2.02

60.0 30.8 31.0 30.9 1.55 2.40

GOOD ANSWER!


BAD GRAPH!

GOOD GRAPH!


What is a GOOD graph?

1) Starting at origin (0,0)

2) Write quantities and units on x-axis and y-axis

3) Has uniform scale

4) All points are transferred correctly

5) Draw one straight line and intersect any of the axes

6) Distribute other points equally


Accepted graph


Rejected graph

more than 1 cm


Rejected graph

more than 0.5 cm


Conclusion

a

b

A) a is inversely proportional to b

B) a is directly proportional to b

C) a is linearly increasing with b

a

b





Conclusion





B) a is directly proportional to 1/b

C) a is linearly increasing with 1/b

a

b

a

1/b

SECTION A : Question 22(a)(i) Relationship





B) a is directly proportional to 1/b

C) a is linearly increasing with 1/b

a

ba

1/b


2(a)(i) Relationship

a

b




a

b





2(a)(ii) Determine Corresponding Value

h / cm

P / Nm-2

1.0 2.0 3.0

1.0

2.0

3.0

4.0 P = 4.0 Nm-2


2(a)(ii) Determine Corresponding Value

1/m / g-1

/ C

0.1 0.2 0.3

1.0

2.0

3.0

4.0 1/m = 0.3 g-1

m = 3.3 g


2(b)(i) Determine Gradient

1/m / g-1

/ C

0.1 0.2 0.3

1.0

2.0

3.0

4.0

Gradient, m = 4.0 C 0.3 g-1

m = 13.33 C g

y

x


2(b)(ii) Calculation problem (involving the gradient)

Reminder!

1)Use the value of gradient obtained in previous question

2) Check for the conversion of units

3) Substitute figures at the correct places

4) Write the final answer in decimal number (Do not give the answer in fraction!!!)

5) Do not forget the UNIT

SECTION A : Question 22(c) Calculation problem

Reminder!1) Check for the conversion of

units2) Substitute figures at the correct places

3) Write the final answer in decimal number (Do not give the answer in fraction!!!)

4) Do not forget the UNIT


2(d) Precaution

Reminder!

1) It is NOT SAFETY PRECAUTION!!!

Take few readings and find the average to reduce random error

Position of eyes is perpendicular to the scale to avoid parallax error

Paper 3

Section B

Variables : Air pressure , Temperature.Manipulated :Responding : Constant :

temperatureAir pressureVolume of air

inference

MV affects RV

affects temperatureair pressure

hypothesis

• When increases, , increases

Temperature

Air pressure

aim

To investigate the relationship between

and

temperature

pressure

Method of controlling manipulated variable

• Manipulate variable : temperaturecontrol : the first temperature

Heat up the water to 20 0C

Method of measuring responding variable

• Responding variable : pressure

• Measure pressure using : Bourdon gauge

Using Bourdon gauge , measure the pressure and record the data

Analyse data

Temperature / K Pressure / Nm-2

20

3040

50

60

Graph

Temperature / K

Pressure / Nm-

2

variables

• Manipulated :

• Responding :

• Constant :

length

resistance

diameter

inference

• _ affects length

resistance

hypothesis

• When increases, , increases

length

resistance

aim

To investigate the relationship between

and

lengthresistance

Method of controlling manipulated variable

• Manipulated variable : length

Control : the first length : 15 cm

Measure 15 cm length of wire and connect both end at point A and B

• Responding variable : resistance

• Measure potential difference using :

Method of measuring responding variable

Measure potential difference using volmeter and calculate the resistance. Record data

voltmeter

Analyse dataLength / cm

Potential difference / V Resitance / Ω

15

20

25

30

35

Length

Resistance

cm

Ω

Cuba soalan muka surat 5

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