ôn thi đại học môn vật lí 2015

Đại cương về dao động điều hòa
 Các khái niệm cơ bản
 !" !#$%
$&'(')*+,+,-./0
1
23',1415/'1'-+-
6'78-9:;+78-9:;
< Phương trình li độ dao động
=9;
=0)*- !#$%9>#+'1;
$?@89;
?@8( A)$>)*


78
BCDE?@8FG
E H'I)*<8
64'J9-;
64/0KL*AM'
6BCD
E N>/0*AM15N'47NJ
'J&-OP9QR;
J#-O-O'*AM#
SJ&-O9'T-;
J&-O)*15( JP7FP7
77<P
PU')*9:;9';
U')*15,V,( ()*0
,$&9';
U$&15,V,( ($&)*
Một số chú ý khi làm bài tập

,1415(
-7-9E;
E-7-9:;7-9:;
E-7-9:;7-9E;
Q"M)-O,1415($/
W7-7FX
6-7-7F7:<
H-O15(
7-7FY7EY-
7-7FY7Y-
!'Z*'23,147[-9[E;9;
( )*07G\<]9-;
$( (0*
7E[9;7<9;
7E<9;7G
/D
7G\<]7F7[-9[G\<]E;7E<9;
$7
G
7F8-9:;7
G
7F-9:;7
*

G
7E[7F-9[E;77E7F[E7:<7F7:9G;

G
7<7F-9[E;777-7FX7FX


G
7E<7F-9[E;777-7FX7FX

G
7G7F-9[E;7G7-7F7
3, phương trình vận tốc
^7G47Y
_78-9:;7F7Y7E8-9:;78-9:;
_78-9:;7F7Y78-9:;78-9:;
N*V
E ^*O 15S( '1*S2'1( 
#*S2#
E J'23*O,
E _*^J6?9 !#$`;4*O( A

78_* !$@4
*O( 7G
E ^*'&*a^J6? !$@**'&*
a !$@2^J6?
^!'ZD*'23,147b-9[E;9;
>,14*Oc

$d*O07G<]9-;
c(0*D
E e7E[2#
E e7[S2'1
/D
,14*O)*7Y7E\<-9[E;

787\<9T-;

$7G<]9-;7F7E\<-9[E;7E\<-9[G<]E;7Ef9T-

7F7:9;
g7F7:9;
4.phương trình gia tốc
7hG47Y7i
_78-9:;7F7Y7i7E8-9:;7E
_78-9:;7F7Y7i7E8-9:;7E
 7E7Fj 10k
,14,#)'23i:7G
*VD
E O,,*O
E *^J6?97G;47Gh* !$@97;4

78
5. hệ thức liên hệ trong dao động điều hòa
Ml8
:7:7G7Fj 10S,
 87
 m7
 7
 7
$Ml8
:7:7
6BCDj )10S,
6.các dao động có phương trình đặc biệt
',14D7
G
:8-9:;9;
H+m7n

G
7Fm78-9:;
H+D
E ^J6?7
G

E 64&-O
E ^*OO
$',1478+78
787:
+D
E ^J6?7
E ?@8Y7
E 4&-O
E *OO
7. cách lập phương trình dao động điều hòa
6,14''78-9:;9;
:c
77<P77
7
:c8
8787
87
:c
A7G7F7F
6BCDFG7F-oG
oG7F-FG
!'ZD
p*'230$&97G;
G

7E9;*O$&
G
7E9T-;

G
79T-
<
;>,14')*
/D
G
7E
G
7F77
8777<9;
J7G7F7
^*7<-9:;9;
