ICSE 9 Physics
Measurements and Experimentation
All the quantities which can be measured directly or indirectly are called physical quantities.
Fundamental quantities
The physical quantities which are independent of other physical quantities and are not defined in terms of other physical quantities are called fundamental or base quantities.
Mass, length, temperature, luminous intensity, electric current and amount of substance are the seven fundamental quantities. Besides these there are two more physical quantities known as supplementary quantities
Supplementary quantities
- Plane angle
- Solid angle
Derived quantities
The physical quantities which can be derived from the fundamental physical quantities are called derived quantities.
Eg: Velocity, acceleration, linear momentum etc. ….
All physical quantities other than the seven base quantities are derived quantities.
Measurement of Physical Quantity
The measurement of a physical quantities is a process of comparing the quantity with a standard amount of the physical quantity of the same kind called its units.
Magnitude of a physical quantity can be expressed as the product of numerical value of the physical quantity and size of unit.
Q=nu
Q=magnitude of a physical quantity
n=numerical value of the physical quantity
u=size of unit
Physical units
The Standard amount of a physical quantity chosen to measure the physical quantity of same kind is called a physical unit.
The essential requirements of physical quantities are as follows
- It should be of suitable size
- It should be easily accessible
- It should not vary with time
- It should be easily reproducible
- It should not depend on physical conditions like pressure, volume, temperature etc.….
Fundamental units
Those physical units which can neither be derived from another unit nor be further resolved into more simpler units are called fundamental units or base units.
Derived units
The units of measurement of all other physical quantities which can be derived from fundamental units are called derived units.
System of Units
It is the complete set of units for both fundamental and derived physical quantities.
1.The FPS System: in this system, the unit of length is foot, of mass is pound and of time is second
2.The CGS System: in this system, the unit of length is centimeter, of mass is grams and of time is second.
3.The MKS System: in this system, the unit of length is meter, of mass is kilogram and of time is second
4.The International System of Units (SI Units) : SI Units is used for scientific measurements
|
Quantity |
Unit |
Symbol |
|
Length |
metre |
m |
|
Mass |
kilogram |
kg |
|
Time |
second |
s |
|
Temperature |
kelvin |
K |
|
Luminous intensity |
candela |
cd |
|
Electric current |
ampere |
A |
|
Amount of substance |
mole |
mol |
|
Angle |
Radian |
rd |
|
Solid angle |
steradian |
st-rd |
Prefixes used for big measurements
|
Prefix |
Symbol |
Meaning |
|
deca |
da |
|
|
hector |
h |
|
|
kilo |
k |
|
|
mega |
M |
|
|
giga |
G |
|
|
tera |
T |
|
|
peta |
P |
|
|
exa |
E |
|
|
zetta |
Z |
|
|
yotta |
Y |
|
Prefixes used for smaller measurements
|
Prefix |
Symbol |
Meaning |
|
deci |
d |
|
|
centi |
c |
|
|
milli |
m |
|
|
micro |
μ |
|
|
nano |
n |
|
|
pico |
p |
|
|
femto |
f |
|
|
atto |
a |
|
|
zepto |
z |
|
|
yoeto |
y |
|
ICSE 9 Physics Measurements and Experimentation NCERT Chapter 1 Free Notes for Best Revision
Revision of ICSE 9 Physics Measurements and Experimentation is a crucial aspect of effective learning. Revision plays a vital role in the learning process and is especially important before exams. Here are some key points you can consider emphasizing in your content:
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- Spacing Effect: Spacing out revision sessions over time, rather than cramming all at once, has been shown to improve long-term retention. Create a revision schedule leading up to the exams to allow for spaced practice.
- Regular Revision over Cramming: Regular and consistent revision throughout the academic year is very important. Waiting until the last moment to cram everything can be overwhelming and less effective than spaced-out revision.
- Self-Assessment: Assess your understanding periodically through quizzes or self-tests. This helps you to gauge your progress and identify areas that need further attention. Refer ICSE 9 Measurements and Experimentation Online Tests.
- Balanced Approach: Remind students to strike a balance between revision and other activities. Adequate rest, exercise, and relaxation are essential for optimal learning and performance.
- Seeking Help: If you face difficulties during the revision process, Refer the videos of ICSE 9 Physics Measurements and Experimentation. Clearing doubts promptly is crucial for a better grasp of the subject matter. You can always ask your doubts on Measurements and Experimentation ICSE 9 Physics NCERT Chapter 1. “Ask a Question” section of LearnoHub.com
By highlighting the benefits and strategies of effective revision, you can approach your studies more mindfully and achieve better results in your exams. Best of luck bachhon!
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Remember, studying with full concentration is a skill that takes time and practice to develop. If you find your mind wandering during study sessions, gently bring your focus back to the task at hand and be patient with yourself. With consistent effort, you can improve your ability to concentrate and make the most of your study time.
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