P�e-.t
PHYSIC_S - _IMI:ORTANT TOP1cs: 3. LAWS_ OF MOTION (i'JEW.t0.1is LAWS)______
( CJa.s.s - 9) ____ (i) First La.w of
Motion (La.w Inertia.) of
i. MOTION ➔ A bod
l/
continl.leS 1n its sta.te_ rest o r. of
➔ Motion 1$. the. cho.n3e. in posiiion of o.n ohject of uniform motion in o. stra.i3ht line unless
with ,cespect to_ time_. it is a.c.ted upon b:i o.n exte rna.l unbo.la .nced
(i) D.isto.nce. - Tue o.ctua.l len3t h covered bl/ a.n force.
object,
(ii)_ Displo.cement - The shortest dis-1:o.nce between (ii) Second Lo.w Motion of
initia . l o.nd fina.l position 1n a. pa.rticula .r ➔ The ro.t e of
cbo.n 3e momentum .of
_o. b o _dl:f of
dire ction. is direc.tl proportiona.l to the e<nba.la.nced
B lj
A -
- . (Fino.l) force o.pplied on it o.nd to.kes pla.ce. in the
(Initio.l.)
--__ __ _ �,- ____ -+
-----=<=Disp�ement direction of the. force.
F o< A
p
F = Ap
[p= mome ntum ]
(iii) Sp_eed - ,. ..:Dc:.i::.
s to.=n.:.:c:,e:_.::CO v e :..:e:,d:_ n,e r e<nit time.
::..:.::.r .6t .6t (p= mv)
=;
D i sto.nce
Spee d �
Time ( V= t)
(iv) Velocit
lj
- Displa.cement per e<nit time a. "' (iii) Third Lo.w Motion of
pa.fticula.r direction. -+ To eve.rt/ o.ction_, ther:e rs a.n eciua.l o.nd
Ye loc.i-1:lj -
Diselo.c.ement
Time
( V = s
t ) opposite. re.o.c.tion .
Exo.mple - When we. j.cunp o.n the 3round,
the 3 round pushes us upwa.rd .
Unit of Speed a.nd Veloc.itl:f - m /s
j Reo.c.tion
I I
2. UNIFORM MO:TION AND NON,c_UNIFO.RM MOTIO!ll
-+ If a .n objec.t c.overs e'll.la.l disto .nces ,n e'lua.l ./[\. Action = - Reo.c.tion
interva.ls of
time, i.t is ca.lled Uniforn, motion. I\
-> If o.n objec.t covers un e'lua.l disto.nc.es in e'lv.a.L •
interva.ls of
time ., it is ca.lled Non- e<niform motion. J Ac.tion
4. WORK, ENERGY AND POWER 5_ . ftRAVITATLON
(i) Work - Ever ::i obje.c.t ,n this ur,iverse o.Hro.c.ts ever :i othei:
- When a. forc.e F
o.d:in5 on a . bodl:t displo.ces it objec.t with a . forc.e. This force is c.a.lled Gro.vita.tiono.l
throv.5h a. disu,.nc.e s ,n -the direction of for:ce, force.
then work done. is
' F F -
jw=Fxsl I m,
Unit - Joule (J') i-1----+•F ; --:-
+---s---➔ �------r------�
(ii) Ene.r5!j
- Ener9 !j is the o.bilit!j to do work . Accordin5 to Ne wton's Lo . w of Gro.vito.t-ion,
Unit - Joule (J) The 5ra.vi-ta.tiona.l force between two bodies is
Tl:t pes - clirecH •proportiona.l to the prodv.c.t of their mo.sse.s
:i
.1. Kine.tic. Ener5� - .Ener5:i possessed b!j o. bod!j o.nd inverse ll/ p,:-oportiono.l to the SCjUO.re of the
due -to its motion.
I I
clista.nce betweeri them.
Cm = mo.ss, v� ve loc-i t!j )
�
F = G M I n'l z.
2. Potentio..l Ener5:i - Ener5� possessed bl:! a. bodl:t ► This force o . ds
due -to its position o.r sha.pe .
r•
► o.lon5 the line.
a.) Gro.viu,.tiono.l. Potentio.l Energl:t Where..
I P.E. = m5h I (m = ma.ss, 5 = �-8-m/s', h • hei3ht)
G = Universa.l 5ro.vito.tiono.l consto.nt
= 6.67 x 10- 11 N,n'/k5•
> joinin 3 the. center's
��
(iii) Power m., ""• = Mo.sse s of the bodies
➔ Powe.r is the ro.te of doin5
I I
WO'r"k. r = Disto.nce between their centers
p = w
-
t Unit - Wo.tt (W)
?. FLOATATION
6. PRESSU.RE
-+ When the. upwe>rd thrust ( buo:,o.nt fore.,) is equo.l
-+ PYe.ssu..re. is define.d a. s_ the. force _a.c.tin5 per
to the weight of the bod:i , the bodll floo.ts ,n
u.nit o.re.o..
the li9-uid-
p = F Unlt - Po.sca.l (Pa.) (i) Upthrust (Bv.o:,o.nt Forc.e)
A 1 Po. = 1 NI m• -+ Upthrust is the force. ex erted b:, o. li'luid on
o. hod.� immersed. 1n it.
Applic.a.iions Pressure of densit:i of liquid
1. Sho.rp objec.ts ho.v" less CLre.o. , so more. pr:essu.re. j u = pf x 3 x v I volume. of li(Juid.
2- T:i res of heo.v� vehicles o.re mo.d.e. wlde.r to displaced
decreQ.Se. pressure. 9. 8 m/s'
3- Hl:tdro.ulic. bro.kes
principle..
a.nd lifts wo,:k on Po.sca.l's (ii) Conditions of Floo.to.tion j Upthrust
Condition Res...lt
Pa.sco.l' s Principle. - Wei sht > Up thrust Socia sink.s ··--·-
................ - ...... -..
··----· ....,._. ___
Pressure. a.pplie.d e>t o.nl:t point of a. confined fluid we;�ht = U p thrust Bod</ floe.ts
is t,.-o.r'\smiH:ed. equ.o.U!:j in o.U d.ir.e.c.tions. WeiQht < Upth'l"u.st Socia rises
F,
'f> A,
...
F
These a.re imporla.nt topic.s fo.- Class 9 -
Leo .rn the form....Lo.s a.nd understa.nd the concepts
with d.io.3.,..0.m.s .
* All -!:he best! @
PHYSIC_S - _IMI:ORTANT TOP1cs: 3. LAWS_ OF MOTION (i'JEW.t0.1is LAWS)______
( CJa.s.s - 9) ____ (i) First La.w of
Motion (La.w Inertia.) of
i. MOTION ➔ A bod
l/
continl.leS 1n its sta.te_ rest o r. of
➔ Motion 1$. the. cho.n3e. in posiiion of o.n ohject of uniform motion in o. stra.i3ht line unless
with ,cespect to_ time_. it is a.c.ted upon b:i o.n exte rna.l unbo.la .nced
(i) D.isto.nce. - Tue o.ctua.l len3t h covered bl/ a.n force.
object,
(ii)_ Displo.cement - The shortest dis-1:o.nce between (ii) Second Lo.w Motion of
initia . l o.nd fina.l position 1n a. pa.rticula .r ➔ The ro.t e of
cbo.n 3e momentum .of
_o. b o _dl:f of
dire ction. is direc.tl proportiona.l to the e<nba.la.nced
B lj
A -
- . (Fino.l) force o.pplied on it o.nd to.kes pla.ce. in the
(Initio.l.)
--__ __ _ �,- ____ -+
-----=<=Disp�ement direction of the. force.
F o< A
p
F = Ap
[p= mome ntum ]
(iii) Sp_eed - ,. ..:Dc:.i::.
s to.=n.:.:c:,e:_.::CO v e :..:e:,d:_ n,e r e<nit time.
::..:.::.r .6t .6t (p= mv)
=;
D i sto.nce
Spee d �
Time ( V= t)
(iv) Velocit
lj
- Displa.cement per e<nit time a. "' (iii) Third Lo.w Motion of
pa.fticula.r direction. -+ To eve.rt/ o.ction_, ther:e rs a.n eciua.l o.nd
Ye loc.i-1:lj -
Diselo.c.ement
Time
( V = s
t ) opposite. re.o.c.tion .
Exo.mple - When we. j.cunp o.n the 3round,
the 3 round pushes us upwa.rd .
Unit of Speed a.nd Veloc.itl:f - m /s
j Reo.c.tion
I I
2. UNIFORM MO:TION AND NON,c_UNIFO.RM MOTIO!ll
-+ If a .n objec.t c.overs e'll.la.l disto .nces ,n e'lua.l ./[\. Action = - Reo.c.tion
interva.ls of
time, i.t is ca.lled Uniforn, motion. I\
-> If o.n objec.t covers un e'lua.l disto.nc.es in e'lv.a.L •
interva.ls of
time ., it is ca.lled Non- e<niform motion. J Ac.tion
4. WORK, ENERGY AND POWER 5_ . ftRAVITATLON
(i) Work - Ever ::i obje.c.t ,n this ur,iverse o.Hro.c.ts ever :i othei:
- When a. forc.e F
o.d:in5 on a . bodl:t displo.ces it objec.t with a . forc.e. This force is c.a.lled Gro.vita.tiono.l
throv.5h a. disu,.nc.e s ,n -the direction of for:ce, force.
then work done. is
' F F -
jw=Fxsl I m,
Unit - Joule (J') i-1----+•F ; --:-
+---s---➔ �------r------�
(ii) Ene.r5!j
- Ener9 !j is the o.bilit!j to do work . Accordin5 to Ne wton's Lo . w of Gro.vito.t-ion,
Unit - Joule (J) The 5ra.vi-ta.tiona.l force between two bodies is
Tl:t pes - clirecH •proportiona.l to the prodv.c.t of their mo.sse.s
:i
.1. Kine.tic. Ener5� - .Ener5:i possessed b!j o. bod!j o.nd inverse ll/ p,:-oportiono.l to the SCjUO.re of the
due -to its motion.
I I
clista.nce betweeri them.
Cm = mo.ss, v� ve loc-i t!j )
�
F = G M I n'l z.
2. Potentio..l Ener5:i - Ener5� possessed bl:! a. bodl:t ► This force o . ds
due -to its position o.r sha.pe .
r•
► o.lon5 the line.
a.) Gro.viu,.tiono.l. Potentio.l Energl:t Where..
I P.E. = m5h I (m = ma.ss, 5 = �-8-m/s', h • hei3ht)
G = Universa.l 5ro.vito.tiono.l consto.nt
= 6.67 x 10- 11 N,n'/k5•
> joinin 3 the. center's
��
(iii) Power m., ""• = Mo.sse s of the bodies
➔ Powe.r is the ro.te of doin5
I I
WO'r"k. r = Disto.nce between their centers
p = w
-
t Unit - Wo.tt (W)
?. FLOATATION
6. PRESSU.RE
-+ When the. upwe>rd thrust ( buo:,o.nt fore.,) is equo.l
-+ PYe.ssu..re. is define.d a. s_ the. force _a.c.tin5 per
to the weight of the bod:i , the bodll floo.ts ,n
u.nit o.re.o..
the li9-uid-
p = F Unlt - Po.sca.l (Pa.) (i) Upthrust (Bv.o:,o.nt Forc.e)
A 1 Po. = 1 NI m• -+ Upthrust is the force. ex erted b:, o. li'luid on
o. hod.� immersed. 1n it.
Applic.a.iions Pressure of densit:i of liquid
1. Sho.rp objec.ts ho.v" less CLre.o. , so more. pr:essu.re. j u = pf x 3 x v I volume. of li(Juid.
2- T:i res of heo.v� vehicles o.re mo.d.e. wlde.r to displaced
decreQ.Se. pressure. 9. 8 m/s'
3- Hl:tdro.ulic. bro.kes
principle..
a.nd lifts wo,:k on Po.sca.l's (ii) Conditions of Floo.to.tion j Upthrust
Condition Res...lt
Pa.sco.l' s Principle. - Wei sht > Up thrust Socia sink.s ··--·-
................ - ...... -..
··----· ....,._. ___
Pressure. a.pplie.d e>t o.nl:t point of a. confined fluid we;�ht = U p thrust Bod</ floe.ts
is t,.-o.r'\smiH:ed. equ.o.U!:j in o.U d.ir.e.c.tions. WeiQht < Upth'l"u.st Socia rises
F,
'f> A,
...
F
These a.re imporla.nt topic.s fo.- Class 9 -
Leo .rn the form....Lo.s a.nd understa.nd the concepts
with d.io.3.,..0.m.s .
* All -!:he best! @
