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Class 9 Science – Gravitation & Kepler’s Laws | Clean + Fun NCERT Notes (PDF)

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These notes are specially prepared for Class 9 Science students and are based on the NCERT syllabus. The document covers Chapter 10 – Gravitation, including Kepler’s Laws of Planetary Motion, explained in simple and easy language. What you will get: • Clean and well-organised theory • Fun and easy explanations for better understanding • Important formulas highlighted • Exam-oriented content • Perfect for revision and quick learning These notes are ideal for students who want to understand concepts clearly and score better in exams.

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Acceleration Due to
GRAVITY)

When an object falls towards Earth due to qravity, its velocity increases,
indicating an acceleratiorn due to gravity (g).

• This acceleration can be derived by equating Newton's Second Law of Motion
(F= ma) with the LIniversal Law of Gravitation rGMm

The formula for acceleration due to gravity is g =GM
where G is the gravitational constant, M is the
mass of the Earth, andRis the radius of the Earth.

• The approximate value of q on Earth's surface is 9,8 m/s2.
often rounded to 10 m/s? for calculations.
g9.8 m/s² 10 m/s2
R
Factors Afecting Acceleration Due to Gravity (g)

Acceleration Due
to Gravity (g)
Altitude (Height) >
Depth (inside Earth)>
Shape of Earth >

Page 4 (OCR)

Acceleration Due to Gravity (g)

• Definition: Velocity increases as cbiect falls to Earth
• Derivation: Neaton's Second Law $F =ma) +
Universal Law of Gravitation.

Variables : G (constanf). M (mass of Earth). R (radius).
Standard Value: 9.8 xms
Factors Affecting
Alttude
Depth
Shape of Earth

Page 5 (OCR)

Universal Gravitational Constant (G) s Acelestion Due Do Gravity )
Overlap

/Constant
evenywhere in
Mass vs. Weight
NNn/kg?)

, V
Varies
(8 m2
on Earth
Overlap
Both are related to the Force of gravity.

Mass is amount of matter in matter in object and is a
Weight is the graviational force actiąct and a vector quantity.

Weight is Mas is measural force acting Weight measured ().

Formula: Wm X4

Units: Mass is measured kilograms (ka): while weight dhanghre.
Consistence: Mass remains Constant changes bast in value of q
in the value q.

Zero Value: Mass never be zero, but weight can zero if q = 0
(e.p. in outer space.

Page 6 (OCR)

anle
Meaning of Free Fall

Motion dá motion
only gravity
Free Fall

•A stone dropped from of building
No air resistance
Equations of Motion in Freell

V =2 - (m)

u-s' = s (m)

Sign Convention for Freefall

Upward direction + Dongative
| Value of g Always negati 9,8 mys or -l0 m/s)
Stone dropped from a 20 m tower
Given:
U=0m/s
9-10 mys -10 m/s
2
s -20

Page 7 (OCR)

Important Formulas-Chapter: Gravity

Kepler bhai ne planets ke rules banaye

• Acceleration Due to Gravity (9)
GM
R2

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