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1/18
Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
1
CHAPTER 1 : INTRODUCTION TO PHYSICS
1.1 Understanding Physics
PHYSICS
Study of the natural phenomena and the
properties of matter.
Solid
Liquid
Gas
Mechanical Energy
Heat Energy
Light Energy
Wave Energy
Electrical Energy
Nuclear Energy
Chemical Energy
Relationship
with
matter
Properties of
Ener
Relationship
with
energy
Properties of
Matter
formsstates
Matter Energy
Mechanics
Properties
of matter
Heat
Light
Wave
in the fields
Electricity &
ElectromagnetismAtomic Physics
& Nuclear
Electronics
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
2
1.2 PHYSICAL QUANTITIES
Base quantity
1 A physical quantity is ..
2 Examples of scientific instruments :
3 A base quantity is a physical quantity which cannot be defined in terms of other physical
quantities.
4 Study the following picture and list the physical quantities that can be measured.
5 List of 5 basic physical quantities and their units.
Base quantity Symbol S.I. Unit Symbol for S.I. Unit
Length
Mass
Time
Current
Temperature
6 Two quantities that have also identified as basic quantity. There are :i) ..unit .. ii) . unit ..
The list of physical quantities :
1. .
2. .
3. .
4. .
5. .
6. .
7. .
8. .
batterybattery
any quantity that can be measured by a scientific instrument.
stopwatch, metre rule balance,thermometer,ammeteretc.
Height,
mass,
size,
age,
temperature,
current
Power,
Thermal energy
l meter m
m kilogram kg
t second s
I Amppere A
T Kelvin K
Light intensity candela Amount of substance mol
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
3
Standard Form1 Standard form = A x 10
n, 1 < A < 10 and n = integer
2 Standard form is used to ...
3 Some physical quantities have extremely small magnitudes. Write the following
quantities in standard form :
a. Radius of the earth = 6 370 000 m =.b. Mass of an electron = 0.000 000 000 000 000 000 000 000 000 000 911 kg =...
c. Size of a particle = 0.000 03 m =
b. Diameter of an atom = 0.000 000 072 m = ...
c. Wavelength of light = 0.000 000 55 m = ..
Prefixes
1. Prefixes are usually used to ...
2. It will be written
3. The list of prefixes :
4. Some physical quantities have extremely large magnitudes. These extremely large and
small values can be written in standard form or using standard prefixes. Write the
quantities in standard prefixes:
a. Frequency of radio wave = 91 000 000 Hz = .
b. Diameter of the earth = 12 800 000 m =
c. Distance between the moon and the earth = 383 000 000 m =
d. Mass of the earth = 6 000 000 000 000 000 000 000 000 kg =
Tera (T)
Giga (G)
Mega (M)
kilo (k)
mili (m)
micro ()
nano (n)
pico (p)
10
109
106
103
100
10-3
10-6
10-9
10-12
Hekto (ha)Deka (da)
desi (d)centi (s)
1010
1
10-1
10-2
Eg :
1 Tm = .
3.6 mA = .
How to change the unit ;
Eg :
1. Mega to nano
2. Tera to micro
3. piko to Mega
simplify the expression of very large and small numbers
6.37 x 106 m
1.673 x 10-27 kg
3.0 x 10-4 m
7.2 x 10-8m
5.5 x 10-7
represent a large physical quantity or extremely small quantity in S.Iunits.
before the unit as a multiplying factor.
1 x 1012 m
3.6 x 10-3A
1.33 MA = 1.33 x 106A
= 1.33 x 10 6-(-9) nA
= 1.33 x 10-15
nA1.23 Tm to unit m unit
1.23 Tm = 1.23 x 10 12m
= 1.23 x 10 12 (-6)m
= 1.23 x 10 18m
5456 pA to MA unit
5456 pA = 5.456 x 10 3 + (-12) pA
= 5.456 x 10 -9pA
= 5.456 x 10 -9 (6)MA
= 5.456 x 10 -15 MA
9.1 x 101MHz
12.8 Mm = 1.28 x 10 1 Mm
383 Mm = 3.83 x 102
Mm
6.0 x 1012
Tm
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
4
Derived quantities
1 A derived quantity is .
2 Determine the derived unit for the following derived quantities.
Derivedquantity
Formula Derived unit Name ofderived unit
area area = length x width m x m = m2
volume volume = length x width x height m x m x m = m3
densityvolume
massensityd 3
3mkg
m
kg
velocitytime
ntdisplacemeelocityv 1sm
s
m
momentum momentum = mass x velocity kg m s-1
Accelerationtime
velocityinchangeonaccelerati
2
11-1
sm
ssms
sm
Force force = mass x acceleration kg m s-2
Newton (N)
pressurearea
forcepressure
weight weight = mass x gravitational acceleration
work work = force x displacement
powertime
workpower
kinetic energy2velocitymassK.E
2
1
potentialenergy
P.E = mass x gravitational acceleration x height Kg ms-2 Joule (J)
charge charge = current x time Ampere second(As)
Coulomb (C)
voltagecharge
workvoltage J C-1 Volt (v)
resistancecurrent
voltageresistance v A-1 Ohm ()
Note that the physical quantities such as width, thickness, height, distance, displacement,perimeter, radius and diameter are equivalent to length.
kg m s- / m kg m- s- (Nm-2)
kg ms -2 Newton (N)
N m Joule (J)
J s -1 Watt (W)
Kg ms-2 Joule (J)
a physical quantity which combines several basic quantities
through multiplication, division or both
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
5
1.3 SCALAR AND VECTOR QUANTITIES
1 Scalar quantities are
Examples :
2 Vector quantities are...
Examples :
3 Study the following description of events carefully and then decide which events require
magnitude, direction or both to specify them.
Description of events Magnitude Direction
1. The temperature in the room is 25 0C
2. The location of Ayer Hitam is 60 km to the
north-west of Johor Bahru
3. The power of the electric bulb is 80 W
4. A car is travelling at 80 km h-1 from Johor Bahruto Kuala Lumpur
1.4 MEASUREMENTS
Using Appropriate Instruments to Measure
1 There are various types of.
2 We must know how to choose the appropriate instrument to ..
3 Examples of instrument and its measuring ability.
Measuring instrument Range of measurement Smallest scale division
Measuring tape
Meter rule
Vernier caliper
Micrometer screw gauge
Quantity which has only magnitude or size
Mass, Length, Speed, volume
Quantity which has magnitude or size and direction.
Velocity, Force, Displacement, Acceleration
measuring instrument with different measuring capabilities.
measure a particular quantity.
Up to a few meters 0.1 cm
1 m 0.1 cm (0.01 m)
10 cm 0.01 cm
less than 2 cm (20 mm) 0.001 cm (0.01 mm)
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
6
4 Sample of measuring instruments :
4.1 Ammeter : ..
4.2Measuring cylinder : ....................
4.3Ruler :
wrong right wrong
10 11 12 13 14 15 Reading = cm
4.4Vernier calliper
A venier calliper is used to measure :
a. b. .
c. d. .
A vernier calliper gives readings to an accuracy of .... cm.
Length of vernier scale = cm
Vernier scale is divided into 10 divisions
Length of the divisions = . cm
0 1
0 5 10
Main scale in cm
Vernier scale
pointer mirror pointer mirror
Pointers image is behind the pointer
incorret reading correct
reading1 2 30 4
1 2 30 4
Pointers image can be seen
Right position of eye (eye are in a line perpendicular to the plane
of the scale)
wrong position of eye
wrong position of eye
water
cm 0 1 2 3 4
inside jawsVernier scale
outside jaws
Main scale
is use to determine the volume of liquid.
is use to determine the length
small object depth of a hole
external diameter of a cylinder or pipe internal diameter of a pipe or tube
0.01cm
The differenct between the main scale and vernier
scale is = . cm
0.9
0.09
0.01 cm
is use to measure electric current
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
7
The diagram below shows a vernier calliper with reading.
Vernier calliper reading = . cm
4.5 Micrometer screw gauge.
A micrometer screw gauge is used to measure :
a.
b. .
c.
Example :
0 5 10
0 1
0 1 2 3 4 5 6 7 8 9 10
0 1
Main scale =.
Vernier scale =..
Final reading =..
Find the division ofvernier scale which is
coincides with any partof the main scale
One complete turn of the thimble
(50 division) moves the spindle by0.50 mm.
Division of thimble= ..
= ..A accuracy of micrometer
screw gauge = ..
Sleeve scale :
Thimble scale : .
Total reading : ..
Sleeve scale :
Thimble scale : .
Total reading : ...
0.15
objects that are small in size
diameter of a wire
diameter of small spheres such as ball bearings
0.5 50
0.01 mm 4.5 mm
0.01 mm 0.22 mm
4.62 mm
2.0 mm
0.22 mm
2.22 mm
0.2 cm
0.06 cm
0.26 cm
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
8
4.6 Some others measuring instruments :
..
. ..
Hands-on activity 1.1 on page 1 of the practical book to learn more about choosing
appropriate instruments.
Exercise: Vernier Callipers And Micrometer Screw Gauge
1. Write down the readings shown by the following
(a)
(b)
(c)
(d)
0 5 10
0 1
0 5 1
6 7
0 5 10
7 8
0 5 10
4 5A B
QP
Answer: 7.79 cm..
Answer: 4.27 cm..
Answer: 6.28 cm..
Answer: 0.02 cm..
Analogue stopwatch digital stopwatch thermometer miliammeter
Measuring tape measuring cylinder beaker
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
9
2. (a) The following diagram shows the scale of a vernier calliper when the jaws are closed.
Zero error = 0.02 cm
(b). The following diagram shows the scale of the same vernier calliper when there are
40 pieces of cardboard between the jaws.
3. Write down the readings shown by the following micrometer screw gauges.
(a) (b)
Answer: . Answer:..
(c) (d)
Answer: Answer:.
4. (a) Determine the readings of the following micrometer screw gauges.
Zero error = 0.02.. mm Zero error = 0.03.. mm
0 5 10
5 6
0 5 10
0 1
Reading shown = 5.64.cm
Corrected reading = 5.62..cm
35
400 5
30
0 5 1035
0 0
45
5
0
0
20
250
15
200 5
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
10
(b) Determine the readings of the following micrometer screw gauges.
5. Write down the readings shown by the following micrometer screw gauges.
(a) (b)
Answer: 6.88 mm Answer: ..12.32 mm(c) (d)
Answer:4.71 mm Answer: 9.17 mm
6. (a) Determine the readings of the following micrometer screw gauges.
Zero error = -0.02 mm Zero error = 0.03.. mm
(b) Determine the readings of the following micrometer screw gauges.
5
0
0 5
15
20
Zero error = 0.03mm Reading shown = 6.67..mm
Corrected reading = 6.64..mm
0 0
45
5
0
0
5
0
0 5
15
20
35
400 5
30
0 5 1035
20
250
15
200 5
Zero error = 0.03.mmReading shown = .6.67..mm
Corrected reading = 6.64..mm
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
11
Accuracy and consistency in measurements.
1. Accuracy :
2. Consistency :
3. Sensitivity :
..
.. ..
Hands-on activity 1.2 on page 2 of the practical book to determine the sensitivity of
some measuring instruments.
Errors in measurements
1. All measurements are values
2. In other word, it is a matter of
3. This is because
4. Two main types of errors:
4.1
Occurs due to :
a)
b)
c)
Examples :
a)
b)
c)
target
target
The ability of an instrument to measure nearest to the actual value
The ability of an instrument to measure consistently with little or no relativedeviation among readings.The ability of an instrument to detect a small change in the quantity measured.
consistent but inaccurate consistent and accurate inaccurate and not consistent
Accuratebut not consistent inaccurate but consistent inaccurate but not consistent
of approximation only.
how close the measurement is to the actual value.
error exist in all measurements.
Systematic errors
a weakness of the instrument
the difference between reaction time of the brain and the action.
zero error is when the pointer is not at zero when not in use.
Range of the measuring instrument absolute error .
Reaction time of the brain.
Initial reading is not at the zero scale zero error
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
12
Absolute error :
.
.
Example :
Parallax error :
Zero error : ...
Correct reading = observed reading zero error
Positive zero error negative zero error
Positive zero error
Zero error =
0 1 cm
0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10
Zero error =
0 1 cm
Zero error of screw meter gauge
Horizontal
reference
Horizontal
reference3 divisions above
horizontal reference2 divisions belowhorizontal reference
Zero error = +0.02 mm Zero error =0.03 mm
Refer to the smallest reading that can be measured by an instrument.
If, the smallest reading = 0.1 cmThen, Absolute error = 0.1 / 2 = 0.05 cm
It occurs because the position of the eye is not perpendicular to the scale ofthe instrument.
wrongright position of the eye (no error)
wrong
+0.03 cm 0.04 cm
where the pointer is not at zero when not in use
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
13
4.2 ..
Occurs due to
a)
b)
c)
Example :
a) ..
b) ..
.....................................................................................................................
1.5 SCIENCETIFIC INVESTIGATION
Steps Explanation
1Making
observation
Gather all available information about the object orphenomenon to be studied.Using the five senses, sight, hearing, touch, taste and smell.
2Drawing
inferencesA conclusion from an observation or phenomena using informationthat already exist.
3
Identifying
and controllingvariables
Variables are factors or physical quantities which change inthe course of a scientific investigation.
There are three variables :i. Manipulated variables physical quantity which changes
according to the aim of the experiment.ii. Responding variables physicals quantity which is the
result of the changed by manipulated variable.iii. Fixed variables physicals quantities which are kept
constant during the experiment.
4 Formulating ahypothesis
5Conducting
experiments
Random error
carelessness in making the measurement.
parallex error , incorrect positioning of the eye when taking the readings.
sudden change of ambient factors such as temperature or air circulation.
Readings are close to the actual value but they are not consistent.
Can be minimized by consistently repeating the measurement at different places in
an identical manner.
Statement of relationship between the manipulated variable andthe responding variable those we would expect.
Hypothesis can either be true or false.
i. Conduct an experiment includes the compilation andinterpretation of data.
ii. Making a conclusion regarding the validity of the hypothesis.
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
14
Plan and report an experiment
Situation : A few children are playing on a different length of swing in aplayground. It is found that the time of oscillation for each swing is different.
Steps Example : refer to the situation above
1 Inference
2 Hypothesis
3 Aim
4 Variables
5 List of
apparatus and
materials
Retort stand, metal bob, thread, stopwatch, protractor, metre
rule,
6 Arrangement of
the apparatus
7 Procedures
The period of the oscillation depends on the length of the
pendulum.When the length of the pendulum increases, the period of theoscillation increases.
Investigate the relationship between length and period of asimple pendulum.
Manipulated variable : the length of the pendulum.Responding variable : PeriodFixed variable : the mass of the pendulum and thedisplacement.
l
1. Set up the apparatus as shown in the figure above.2. Measure the length of the pendulum,l = 60.0 cm by using a meter
rule.3. Give the pendulum bob a small displacement 300.Time of
10 oscillations is measured by using a stop watch.4. Repeat the timing for another 10 oscillations. Calculate the
average time.
Period = t10 oscillations10
5. Repeat steps 2, 3 and 4 using l = 50.0 cm, 40.0 cm, 30.0 cmand 20.0 cm
Retort standrotractor
l
bob
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
15
8 Tabulate the
data
9
10
11
12
Analyse the
data
Discussion
Conclusion
Precautionsstep
T / s
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Graf of period, T vs
pendulums length, l
11..558811..550011..331111..119900..9999
1155..881155..001133..111111..9999..99
1155..771155..001133..111111..9999..99
1155..881155..001133..111111..9999..99
6600..005500..004400..003300..002200..00
PPeerriioodd// ss((TT ==tt1100//1100))AAvveerraaggee2211
LLeennggtthh,,ll//
ccmm
Time for 10 oscillations / s
0 10 20 30 40 50 60 l / cm
Precautions :1. Oscillation time is measured when the pendulum attained a
steady state.2. Time for 10 oscillations is repeated twice to increase accuracy.3. Discussion (refer to given questions)
The period increases when the length of the pendulum increases.Hypothesis accepted.
1. avoid from strong wing blowing2. use small amplitude3. time taken at the equilibrium position
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
16
Reinforcement Chapter 1
Part A :Objective Question
1. Which of the following is a base SI
quantity?
A Weight B Energy
C Velocity D Mass
2. Which of the following is a derived
quantity?A Length B Mass
C Temperature D Voltage
3. Which of the following is not a basicunit?
A Newton B kilogram
C ampere D second
4. Which of the following quantitiescannot be derived?
A Electric current B PowerC Momentum D Force
5. Which of the following quantities is
not derived from the basic physical
quantity of length?
A Electric charge B Density
C Velocity D Volume
6. Initial velocity u, final velocity v,time tand another physical quantity kis related by the equation v - u = kt.The unit forkisA m s
-1B m
-1s
C m s-2
D m2 s-2
7. Which of the following has thesmallest magnitude?
A megametre B centimetreC kilometre D mikrometre
8. 4 328 000 000 mm in standard form is
A 4.328 x 10-9 m B 4.328 x 10-6 mC 4.328 x 106m D 4.328 x 10
9m
9. Which of the following measurements
is the longest?
A 1.2 x 10-5
cm B 120 x 10-4
dm
C 0.12 mm D 1.2 x 10-11 km
10. The diameter of a particle is 250 m.What is its diameter in cm?
A 2.5 x 10-2
B 2.5 x 10-4
C 2.5 x 10-6 D 2.5 x 10-8
11. Which of the following prefixes is
arranged in ascending order?A mili, senti, mikro, desi
B mikro, mili, senti, desiC mili, mikro, desi, senti
D desi, mikro, mili, senti
12. Velocity, density, force and energy are
A basic quantities
B scalar quantities
C derived quantities
D vector quantities
13. Which of the following shows thecorrect conversion of units?
A 24 mm3
=2.4 x 10-6
m3
B 300 mm3=3.0 x 10-7m3
C 800 mm3=8.0 x 10
-2m
3
D 1 000 mm3=1.0 x 10
-4m
3
14. Which of the following measurements
is the shortest ?A 3.45 x 10
3m
B 3.45 x 104 cmC 3.45 x 10
7mm
D 3.45 x 1012
m
15. The Hitz FM channel broadcasts radio
waves at a frequency of 92.8 MHz inthe north region. What is the frequency
of the radio wave in Hz?A 9.28 x 10
4B 9.28 x 10
5
C 9.28 x 107 D 9.28 x 10
10
16. An object moves along a straight line
for time, t. The length of the line, s is
given by the equation 2
2
1gts . The
SI unit of g is
A m2 s2 B m s-2
C s-1
D s-2
m
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
17
Part B : Structure Question
1. A car moves with an average speed of 75 km h-1
from town P to town Q in 2 hours as
shown in Figure 1. By using this information, you may calculate the distance between the
two towns.
P Q
Figure 1
(a) (i) Based on the statements given, state two basic quantities and their respective
SI units.
(ii) State a derived quantity and its SI unit.
(b) Convert the value 1 . m to standard form.
5 x 10-3
(c) Complete Table 1 by writing the value of each given prefix.
Table 1
(d)Power is defined as the rate of change of work done. Derive the unit for power interms of its basic units.
(e)Calculate the volume of a wooden block with dimension of 7 cm, 5 cm breadth and 12cm height in m
3and convert its value in standard form.
Distance : m and time : s
Speed m s-1
= 0.2 x 10 m= 2.0 x 10
2m
10-9
10-6
106
109
Power =time
work=
time
ntdisplacemeForceUnit =
s
mkgms 2= kg m
2s
-3
Volume = (7 x 10-2
) (5 x 10-2
) (12 x 10-2
)= 420 x 10
-6
= 4.20 x 10-4
m3
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Physics Module Form 4Teachers Guide Chapter 1 : Introduction To Physics_________________________________________________________________________________________
18
2. Figure 2 shows an ammeter of 03 A range.
Figure 2
(a)(i) Name component X. ...
(ii) What is the function of X? .
(b)Table 2 shows three current readings obtained by three students.
Table 2
(i) Did all the students use the ammeter in Figure2? ...(ii) Explain your answer in (b)(i).
3. Figure 3 shows the meniscus of water in a measuring cylinder K, L, and M are three eye
positions while measuring the volume of the water.
(a) (i) Which of the eye positions is correct while
taking the reading of the volume of water?
.
Figure 3
(b) The water in the measuring cylinder is
replaced with 30 cm3of mercury.
(i) In Figure 4, draw the meniscus of the
mercury in the measuring cylinder. Figure 4
(ii) Explain why the shape of the meniscus of mercury is as drawn in (b)(i).
No
3rdreadings obtained by student 2 and 3 are out of the meter range.
L
The cohesive force is larger than the adhesive force
Mirror
To avoid parallax error