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PHYSICS GRAVITATION
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gravitation notes physics a level igcse
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Chapter3
The will to win,
the desire to succeed,
the urge to reach
your full potential…
These are the keys
that will unlock
the door
to personal excellence.
DREAM BIG ... AIM HIGH ... NEVER GIVE UP ...
, 3.1 Newton’s Universal Law Of Gravitation
A. Gravitational force
Newton’s Universal Law of Gravitation
state that
Gravitational force, F is directly proportional to the product of mass of the object and inversely
proportional to the square of the distance between them
FORMULA
F = Gravitational force between
two objects
𝐺𝑚! 𝑚# G = Universal gravitational
𝐹=
𝑟# constant
(6.67 x 10-11 N m2 kg-2)
m1 = mass of first object
m2 = mass of second object
r = distance between the center
of two objects
Factor that affect gravitational force
mass of object, m distance between objects, r
Relationship Relationship
mass, m , distance, r ,
gravitational force, F gravitational force, F ¯
be amazing GRAVITATION 2021 with Teacher Alina 2
, m1 F1 F2 m2
r
F1 = F2
$%! %#
𝐹= &#
The moon can orbit around the
between Moon and
Earth as there is GRAVITATIONAL FORCE
Earth
Pathway of the
moon if no
gravitational
force
gravity
The
planets around the Sun GRAVITATIONAL
can orbit because of the FORCE imposed between the planets and the Sun.
be amazing GRAVITATION 2021 with Teacher Alina 3
, B. Relationship gravitational acceleration, g, on the surface of the
earth with the universal gravitational constant, g
r
Object
Earth
Newton's Second Law of F = mg 1
Motion
Newton’s Universal Law of
Gravitation 𝐺𝑚 𝑀 2
𝐹=
𝑟"
𝐺𝑚 𝑀 𝐺𝑀
1 = 2 mg = 𝑔=
𝑟" 𝑟!
Do not walk PROUDLY on the EARTH;
your feet cannot tear apart the Earth nor
are you as tall as mountains
Quran 17:37
be amazing GRAVITATION 2021 with Teacher Alina 4
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