Summary Gravitational fields

Gravitational fields

Gravity :
the mutual attraction between all matter (exists due to the mass of the
objects



Newton 's law of universal
gravitation
:




other particle with force
Every particle with mass in the universe attracts
every a which is directly proportional to the


of their of the distance
product masses and
inversely proportional to the
square between their midpoints

FX MFI
✓ K9

f- = GMF -
G =
universal
gravitational constant =
same for whole universe =
6,7--10
_ ' '
N . M2
_




Kg
'

( between
.

m


MIDPOINTS)



Direction :
find using logic/ interpretation NOT a
sign

=
To → M
calculate the mass of a
planet
Free
falling objects →
9=9%2
Gravitational field diagram




¥* 7
n
n




Gravitational field (strength )

The force
acting per unit mass
=
Em '

g. unit of
-




g
N
Kg
= .




2.
'

kg.ms kg
-
_
=




2
= M g- .




field
gravitational gravitational acceleration
=



/ \

Close to surface close to surface of
' -2
of ear th = 9,8N .Kg 9,8ms
_


the ear th =


towards the midpt of the earth
towards the midpt of the earth
1 I
will experience rate of of velocity
object of 1kg '
change
free fall
_


918N -2
a force of •


kg towards in =
9,8ms towards
of the ear th
the midpoint of the ear th the midpoint




Mass → the amount of matter in an
object
force the Earth
weight > the
gravitational exer ts on
object near its surface
-

on or
any