These notes include notes on electrostatics, electric circuits, gravitational fields and photons and electrons. Summarizes everything you need to know for these sections in one or two pages according to the SAGS document. Learning for your next physics exam couldn't be any easier!
GRAVITATIONAL FIELDS WHEN DEALING WITH RATIOS
consideringthefactorthateachmass ordistance
law of Gravitation
Newton'suniversal has changedby
Everyparticle with massinthe universeattracts
factors
every other particle witha force which is directly subin intoformulas thatdietormasshaschang
proportional to the productof their masses and egoIf distance
isdoubled whatforcewilltheyexerton
inversely proportional to the square of thedistance each other
between their centres Fnew
iffy from
omit
attrition A ofobjectland21kg
mass
FG
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between mafdistanitshaivedimassofaisdoub
distance between ledwat
l centre
op objects is the new force
universalgravitationalconstant enow
617 10 NM kgY Eg
leg
weight theEarthexertson anyobjecton
gravitationalforce
or nearitssurface
giweopjugiftajfiin.am
is changed by afactorof a so thatthenewfore
Gravitationalfield region in space where a mass will is it what is a
experience aforce describe NB Bothobjectsor
define
force actingper unitmass 9m Is t
Yt experience onesame
gravitationalfield
f force newtonsordlaw
direction specificcan
NB
I I
togravity
It
acceleration due
gravitational field a direction
isalway
g
constant does not
change
oppuniversalgrov
goni.mn
m.g
M massofplanet ing
Y independent
of
gsgravauf itsweight be when it orbitstheearthat
distance
of twice theradius the earth
of
r distfrom centreofpl mass ofanobject whew W
anyp on planet lip 8
figusg g
0 1
Witha small
for
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between2 objects duetotheirmassN Famixme it would notbe
is thebiggeronemanoh
g is y
gravaco
which specific to a planet mis enough fortheear
largertheforce
to acceleratetow
MASS US WEIGHT
fat the spacecraftT
spacecraft isstil
WEIGHT inBarons groupie
amountsubstancethat force of attraction between
a planet
anobjectis madefrom and anobject
constant anywhere inuniverse Differs dependingon mass ofplanett distancefromplanet'scentre
Measured in Rg Measured
inN
at
goal h Alsothereis a strongergravitationalfieldatthepoles
notwhen dealingwithsmallobjectssuch aspeopleandsatellitesthedistance
fromtheir centretothesurface theobjectissmall Maybeignored
of
Butlargeobjectssuchasplanetst asteroidsyouMusttakethedistance
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, commie MYm
ELECTROSTATICS
notify
chargedobjectsoccur
between
mama
are
which
objects
in if
of
principle
ofCharge
conservation canbecharged'hyyriction
Insulators
charge isthe principle thatthetotal
canbecharged
conductors
conservation
of electric
charge
metals by
makingcontactwithanothercharged
inan
object
isolated orbyinduction
systemneverchanges oblationinduce
charged
on
charges
Iftwo objects touch and separatethenewcharge oneachobject
will bethesum the
othernearbyobjects ftp.gjifqgyyanage
of oneachobjectdivided 1
originalcharge by o gifting
Qi
anew
ELECTRICFIELDI
anew New
chargeon
each
object
y
at on1st
originalcharge
object o An electricfieldasa regionofspaceinwhichanelectricchar
ai origchargeonand10 experiences aforce Thedirection theelectricfieldata
of
point isthedirectionthat a positivetest charge tie
Takes account
shyofcharge wouldmove
if placedat thatpoint
Transfer ofelectrons Alwaystravelfrom positive tonegative
when I chargedobjectstouchelectronstransferfrom
theobject withthemostnegativeobjecttothe The electricfield due to a pos charge alwaysMor
most positiveobject outand awayfromthecharge
chargeeitherhasanexcess of electrons
fvecharged the electric field dueto a nog charge alwaysMov
of lackof livecharged
electrons in and towards thenegcharge
pointcharges
Neutral Noofprotons no
ofelectrons
Ne
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sq learn
I
Ne s no Ofelectronstransferred
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Ap s Charge
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withcharge
ofsetouchthen
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in
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newchargeoneachobjell fieldlinesleaveconductionsurface godegrees
transferred aoriginal anew new 01
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from BtoA
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isdirectlyproportional totheproductofthechargesandinversely ones where
you havetoworkoutresultantforces
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gutsultantforce experiment
proportional tothesquareofthedistancebetweenthecharges we
p
Coulombsconstant 9 109NM
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and I FAonB B
between
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answers
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