Summary Grade 12 IEB Physical Sciences - Newton's Law of Universal Gravitation (Physics Section D)
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Course
Physical Sciences
Institution
12
Covers the various sections relating to Newton's Law of Universal Gravitation.
Includes notes from the textbook, as well as additional class, video and research information, diagrams and practice questions.
Applicable to all IEB Grade 12s.
Written by a 95% < student.
Newton's Law of Universal Gravitation
Every particle with mass in the universe attracts every other particle with a force which is
directly proportional to the product of their masses and inversely proportional to the square of
the distance between their centres.
𝑚1 𝑚2
F=G
𝑟2
Fg
m1 m2
Fg
r
m1 - Mass of object 1
m2 - Mass of object 2
r - Distance between their centres
G - 6.7 x 10-11 N.m2.kg-2
Fg m1.m2
ɣ
1
Fg
ɣ
𝑟2
Fg
Gradient = G
𝑚1 𝑚2
𝑟2
Weight (Fg)
The gravitational force the Earth exerts on any object on or near its surface.
𝑚 𝑚
F = G 𝑟1 2 2 or Fg = m x g
Unit: Netwons, N
Mass
A measure of the amount of matter that an object is composed of.
Unit: Kilograms, kg
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