MỘT số bài tập vật lý DÀNH CHO học SINH THCS
Bạn đang xem bản rút gọn của tài liệu. Xem và tải ngay bản đầy đủ của tài liệu tại đây (44.56 KB, 4 trang )
!"#$%$&!'!
()*+,*(+-(
./0120/345.!$6$7$869!$:;!$866<9=2>1$?!@./016<$862.!$A/$86BCDE3.FG/9H@.
/01F./HIJ6@#5K!L$6M!$866N1BON/F7!6P6@Q!R!$G2.6$74LS!BT!6UF<!B
C%V6$W"#$%$&!'XY1Z[/:!;E\!:$<!X;S[/W!$$]V$&!;S
V/?FY/$A;
XXXXXXXXXX^__^XXXXXXXXXXX
"
.-"
VG/20//:7!!`Va;I!!?;6$;Eb!G!2Y20!/c6-[/:7!!`Va;I!!9V;6$;Eb!
G!2Y20!/c6(Bd!$20!/c6/:;!@e!$6U;20/f/:&!6Ua;I!!g
@$VE6P6/]ha;I!!i/:7!6D;V@j!6P6/]hL$7U!/$V!ibJ6@./7P!L$P6:#
Ug
679P!$20!/c6/:;!@e!$/d!$k76/:7!$V6D;V2.@B
.("
G/!lmQ1/:&!a;I!!'B-*na;I!!?;2Y20!/c6-oLF*$[-*na;I!
!/S1/$m72Y20!/c6-(LF*$2.7Q!!6M!3Q2Y20!/c6ZLF*$Bd!$20!/c6/:;!
@e!$6RV!f/:&!6Ua;I!!'B
.n"
G/H/H6$;Eb!G!/:&!!`V7Q!!?;2Y20!/c6-oF*9B$?!!6M!3Q[lm6$;Eb!
G!2Y20!/c6)oLF*$/:7!!`V/$V!?;2.-oLF*$/:7!!`V/$V!9V;Bd!$20!/c6
/:;!@e!$6RVH/H/:&!6Ua;I!!IB
.)"
G/!lmQ1I)LF2Y20!/c6-(LF*$[9V;f!NE5]!3Qb6$pVlm/:7!)+1$q/
:#/S1ZLF2Y20!/c6ZLF*$B
Vd!$20!/c6/:;!@e!$6U;!NE/:&!/N/6Ua;I!!IB
@\#/$%20!/c66RV6$;Eb!G!/$m7/$V!B
6\#/$%@b;5r!6$;Eb!G!6RV!NE/$m7/$V!B
.o"
G/6V!H6$QE/]@S!'S!@S!:#/:=2>'/:&!FG/5M!9H!Bs!Y66$QE!$V!$$VE6$UE
6$0F/$e20!/c6/:;!@e!$6U;6V!H/:7!9;c//$V!2>9\3Y!$<!g0!/c6:&!6RVH/H
L$H!tB
.u"
G/$.!$L$P6$l;c!$S/6?;/$V!FPEV!6$;Eb!G!6v!6$>;FN/-1$q/BS;!f
2Y20!/c6N1H20!/c6@V!?;/$e6$WFN/)oDEBs!S;$.!$L$P6$fw!E&!/:&!/$V!FPE
/$e1$UFN/@V73D;bl;c!$S//$V!g
.,"
V!'2.w!6P6$!$V;u++F2.6v!6P6$@w6/!)++FB@x!FG/1$P/9q!
$A;Bs9V;@V73D;!a;V!9P/='!$m/$NE"
VS!!tg
@S!2V!g
0!/c6/:;E>!DF/:7!L$H!L$d3.n)+F*9
.Z"
:&!7Q!!'y-++LF6f$V6$S6lm6v!L$=$.!$FG/3q62.6$QE!J66$>;!$V;BTm/]
'S!2Y20!/c6(+LF*$2.Fz3?!J6n+LF/$elm3Q/ !/c6/$&FoLF*$BTm/]S!'
2Y20!/c6(+LF*$!$!Fz3?!J6n+LF/$e20!/c66RVlm3QUFFG/!`V972Y/:Y6B
d!$"
V0!/c6/:;!@e!$6U;Fzlm/:&!7Q!!'g
@V;@V73D;/$e$Vlm{1!$V;2.6$z{1!$V;6P6$'@V7!$&;LFg
.|"
G/6V!H!V!9H![l;N/1$P//]'$Y!/$}!/Y/$m71$<!2;H!f62Y@9H!B7
5M!!Y66$UE9V;FG//$V!/y-++DE[6V!HS!2%/:d=@@&!LV2.6P6$@FG/7Q!
yn++FB
Vd!$20!/c66U;5M!!Y6972Y@9H!B
@S/'y)++FBd!$20!/c66RV6V!H972Y@9H!B
.-+"
TP6%!$20!/c66U;5M!!Y6L$6$UE:VL$s2M!Y6g$76P65~!6~"6c67!$e!$/:~[/$Y6
7[#!$#@PFDEB
. "
G/H/H3m75c62Y20!/c6/:;!@e!$-[oF*9FN/L$7U!/$V!Z+DEBc66V7-(F[6H!/$x!
FV9P/@j!-+•6H!57G!6<9!$:VB:8!3J!6RVH/H3.n+++++B
Vd!$6H!9;N/6RVG!6<H/HB
@d!$3k6L€757G!6</P65~!2.7H/HB
.-("
G/2&!@/$€1L$c3J!Fy-+J6!D!3&!G6V7$y-F972Y@>F{//NF/$€1:#/$U6$7!f
:<l;c!BV;L$2V6$QFL$H!.!$#2.7/NF/$€12&!@!UE3&!/YG6V7$•y+[ZFB
Vd!$6H!!D!2&!@/YG66V7$2./$S! !6U;2&!@/QfB
@e9V72&!@L$H!!UE3&!/YG6V7$gd!$GUF6<! !2./W9cpVGUF6<! !2.6<
! !3q6?;6RV2&!@B
6V;L$3&!/YG6V7$•2&!@3Q:<l;c!2V6$QF2.7/NF/$€1:#!UE3&!/YG6V7$••6$7:j!
/W9cGUF6<! !L$H!tB
.-n"
G/!$!012.7FG//NF2P!5.Eo6F2.FG/1$?!!$5.o6Fl;E&!:V1$dV9V;2P!B;c!:q/
!$:V1$U5v!3k6-Z++Bd!$6H!b:q/!$:VL$s2P!B
.-)"
G/20/6fL$c3J!Fy(L[/$b/d6$y-+XnFn!jF/:7!$#!Y6=G9D;$+yoFB$U/$k6$A!
FG/6H!@j!@V7!$&;b!D!!f3&!G6V7yoF/:&!F{/!Y6g$7@S/!y-+nL*Fn[@sa;V
9k/$VEtFk6!Y6Bsa;V9k/$VEt6RV‚'L$20/@x/?;!$H3&!F{/!Y6B
.-o"
fZL$c!$HF$e!$3011$<!6Q!$u6F/:7!f6fFG/L$c@:z!=@&!/:7!B
VY6D!ƒVL$H!6fa;U6D!!.7[1$U/$k6$A!d/!$N/@V7!$&;3?!6D!b/eF:VL$c:z!g
@G//:7!ZL$cf6fL$c3J!3.o)+BsL$c!.E{6$VE:z!gS;:z![/eF/$b/d6$1$?!
:z!g$7@S/'3y([,*6FnB
.-u"
G/3Ml76f6$>;5./k57(+6FJ6/:m7/$}!w!B„${/FG/20/6fL$c3J!-++2.7ƒV
6D!/:m7=?;5Y6RV3Ml7/$e6$>;5.6RV3Ml73.(o6F[6M!!S;{/20/6fL$c3J!(o+2.7I
6V6!/$e6$>;5.6RV3Ml73.n+6FBd!$L$c3J!6RVƒVB
.-,"
G/!/$JLF$7.!3.FFG/20//:V!9w6a;4B„$mF6D!/$NE20/6fL$c3J!Fy)(+[L$/$U
6$eF20/2.7FG/@e!$k!?E!Y62.3NE3J!!Y6/:.!:VmF6D!J6F+yn+B
Vd!$L$c3J!:&!6RV$J1LF5v!b3.F20/g
@S;$J1LF#F2.!X@Q6/$eL$c3J!2.!I5v!3.@V7!$&;g7/$b/d6$6RV20/@j!/t!
/$b/d6$6U;2.!X@Q6mF5v!2.L$c3J!:&!6RV!Y6[2.![@Q63?!3J/3.-*6Fn…-|[n*6Fn…
-+[o*6FnB
.-Z"
G/6${!NE@j!/$RE/!$6fFG/3z$z!@&!/:7!B.F/$S!.7blP6%!$J6/$b/d6$1$?!
:z!F.L$H!012Kg$7@S/L$c3J!:&!6RV/$RE/!$3.B
.-|"
IElP6%!$/$b/d6$[L$c3J!F[L$c3J!:&!6RVFG/6$N/:x!L$H!/$NF!Y6[@S/:j!"
„$/$U6$eF20/2.7FG/@e!$k!?E!Y6/$eL$c3J!6RV6U@e!$/ !3&!/$&FF-y(-[,o…6M!
L$/$U6$eFFG/20/2.7FG/@e!$k!5?;/$eL$c3J!6U;6U@e!$/ !/$&FF(yo-[,oB$7@S/
L$c3J!:&!6RV!Y62.5?;3?!3J/3.-y-*6Fn[(y+[|*6FnB
.(+"
V@e!$$e!$/:~'2.6f/:~6/$}!w!/$H!PE2Y!$V;@j!FG/c!!$s6f5;!/d6$L$H!
P!LbBF{/PE6RV@e!$'6V7$<!F{/PE6RV@e!$(+6FB/Vt2.7@e!$o[o3d/!Y6Bd!$
P19;N/6RV!Y6/P65~!3&!PEFz@e!$gS//S/5A!6RVFz@e!$3.-5F(2.o+6F(BS/
5!Y6y-+)*FnB
.(-"
G/@e!$$e!$/:~6f/S/5A!-+6F(6$wV!Y6/YG6V7(+6F2.FG/@e!$$e!$/:~L$P66f/S/5A!
-o6F(6$wV!Y6/YG6V7)+6FB
Vd!$P19;N/2.P13k66RV!Y6/P65~!3&!PEFz@e!$9V;L$!c/$H!PE2Y!$V;@j!FG/
c!!$s6f5;!/d6$L$H!P!Lb2.PE6RV$V@e!$!jF/:&!6v!FG/F{/1$}!!jF!V!B$7
5!Y6y-++++*FnB
@Ct/$&F5?;2.7@e!$6G/5?;6V7-(6FBd!$G6$&!$3A6$Fk6!Y6/:7!$V@e!$9V;L$6$N/
3s!w!E&!B$755?;yZ+++*FnB
.(("
:7!@c!#!/>!c!!$V;6fn#!/$0/6fL$c3J!!$!$V;2.FG/#!U6fL$c3J!
L$P6BIE6$W:V6P6$/eF#!/>!U2Y(3?!6D!@j!6D!O7X@m6X2V!F.L$H!6fa;U6D!!.7B
"
.-"
d!$!$A/G6D!@j!6U;!Y6L$1$V(3d/!Y6Z++2.7n3d/!Y6=(++/:7!(/:!$J1"
Vsa;V9k$V71$d/:7!a;P/:e!$/:;E>!!$A/
@A;9;N//:V7t!$A/3.(+•B
S/!$A/5;!:&!6RV!Y63.)(++†*L„[L$c3J!:&!6RV!Y63.-+++L*FnB
.("
Cbl`34/$f6c!@j!1$<!1$P1hn9H(3Q!$i[!/V!DF!f2.72Q!Y66$wVn1$?!!Y6
9H$MV2Y(1$?!!Y63Q!$BIElP6%!$!$A/G6RV!Y6hn9H(3Q!$i!S;!$A/G6RV!Y63Q!$
!jF/:7!L$7U!-o+S!(++BS/!$A/G9H3.-+++B
.n"
Cb6f(+3d/!Y6=nu+[!/V/:G!!Y6(++2.7!Y6-+++Bd!$/$b/d6$!Y6Fz37QBsa;V
9kFN/!$A/2.!Y6y-*6FnB
.)"
$V!Y62.7:J;/V/$;J6$z!$J16fL$c3J!-ZZ=!$A/Gn++Bd!$L$c3J!!Y62.
:J;I1$VBS/!$A/G@V!?;6RV!Y62.:J;3.Z++2.(++[!$A/5;!:&!6;V!Y62.
:J;/<!w!3.(o++†*L„2.)(++†*L„Bsa;V9k@VE$<2.9kFN/!$A/B
.o"
f$V@e!$6P6$!$A/[@e!$'k!o3d/!Y6=u++[@e!$k!-3d/!Y6=(++BOf/FG/d/!Y6/]
@e!$'9V!@e!$[9V;L$@e!$6D!@j!!$A//V3Q:f//:=3Q/]@e!$9V!@e!$9V76$73J!!Y6
=Fz@e!$c!!$@V?;Bq6f!$A/G6D!@j!6U;!Y6`@e!$'3.o++BsI:f/@V7!$&;
!Y6/]@e!$!89V!@e!$LVB
.u"
Cb7!$A/G6U;!Y6[!/V!$q!2.7!Y6FG/!$A/LS[L$6D!@j!!$A/[!$A/LS6$W
nu[++Bs!$A/G/$k66RV!Y63.@V7!$&;gS/!$A/5;!6RV!$A/LS3.y-[|†*G2./:Y6L$
!$q!2.7!Y6!f6$W(+[++BY66?!76fL$c3J!-+VF
.,"
CtFG//$eV!Y6!f!2.7!$A/3J!LS[!$A/G6RV!f/ !/$&Fo+BQt/$&FFG//$eV!Y6
!f!!pV2.7!$A/3J!LS[!$A/G6RV!f/ !/$&Fn+!pVBs!S;/Vt)Z/$eV!Y6!f!2.7
!$A/3J!LS/$e!$A/G6RV!f/ !3&!J6@V7!$&;Ggsa;V9k/:V7t!$A/2YFH/:!
@&!!7.B
.Z"
:G!+[o3d/!Y6=(++2Y-[o3d/!Y6=)++2.n3d/!Y6=-+++Bd!$!$A/G6D!@j!Bsa;V9k
FN/!$A/2.!Y6y-*6FnB
