Summary Graviational Fields IEB matric notes

Gravitational Fields-


Force
acting per unit mass




Newtons 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


Gr ,
ma

F =
r2


F Force attraction between objects (N)
·
of

Gravitational (6 "N m2
kg)
" *



G ·
Constant ,
7 .

10 .




M
·
masses
(kg)
j · Distance between centres of objects (m)



Weight : Gravitational force the earth exerts on on
object on or near to its surface




Finding gravitational _a eleratio __ Nanet
"
Eg is gravitationalForce between 2jets Que
_
-




I

GMq I
I
to their mass
g
=
I
-2
!
gravitational
I
specific to
·



g is acceleration a




!
I

9
·
gravitational acceleration (m st
.

I Planet
"N m2
kg)
-
Gravitational (6
" *



G ·
Constant ,
7 .

10 .
- - - - - - - - - - - - - - - - - - -




My Mass of planet (kg)
↑ · Distance from centre of planet



-Ratios-


F = Gm , mc
2

j




·
If distance is doubled

-

Fnew =
F

4

If
·

distance is halved

-
Enew = 4F



·
If mass is doubled

-

Fnew = 2 F