Tải bản đầy đủ (.doc) (4 trang)

Kiểm tra 1 tiết lớp 12 phần cơ học vật rắn

Bạn đang xem bản rút gọn của tài liệu. Xem và tải ngay bản đầy đủ của tài liệu tại đây (133.35 KB, 4 trang )

THPT NGUYỄN VIẾT XUÂN KIỂM TRA 1 TIẾT
LỚP: 11 MÔN:VẬT LÝ
Đề 1
                   
                   

    ! " #$ %& '() *) + #,- ( '.& /  01

2 ',1 #,- '3 *)('1
4156&789- :


; <1=1#,->,-?@1
AB CB B DB

E&$?)F!G,)3#,-'3#,& +('.&H
A)')F I1('J
K
1L) M)&N)')F 
C)')F I11),(1L) M)&N)')F 
1),(!6&O/J&P*13 #Q'L!
D)')F I1('R)L) M)&N)')F 

S,?,!/0FT/71)N6&7&U0) 1)N0) 6&7>,'V1&VI1&,/O&W&9H!)&P$
0) #,-'3
A26&7 C26&7 26&7 D26&7
&,&W1 AC'V1&9&)3R) X2 0&()/PY1 2#,-#,& +Z @ 1,1#,
'OAJ11*)&,&&! ! "#$%& >,&,&'()*)+Z/





l
1),([)\
R!/1]&9')F 0&()/PY1 !'OC>,&,&^_&,&'PY&`0&J1('OT.%
@ 1,1&U0&)*).%&a1'W1&,&('1?@1
A
1

 l
C
1

 l
 
1
l
D
1

 l
,)?$&b"ACI1'1=1#,-2('1ω
A
;ω
C
cdG( J "#$%&
C
A
e
e
'J

f
)*)+
#,-')#, >,AC1)$.!G,'-H
A C  D
#,-#,& +('.&RP*)$R+1>, ! "/\0&J1'g)0&$0&J1c!1
PN1&Y6-2'L)/PY1&,-'g)/
A ! "#$%&>,'()*)+' C ! "'1/PY1>,'()*)+'
0&()/PY1>, D1),(1>,
'h,426&a12 i1#,-'3#,& +#, J11*) j'h,])
A


C

/O
/PY/('R)>,')F Ak&'h,>,')F Cl&'h,mk$&  '!L?@1n,?$0%&
>,'h,C)F&W/)&o1)p,
A


C

/
A
A
;
C
 C
A
;

C


A
;
C


D
A
;
C



41 ! "#$%&e;201

2?$0%& lU&qm,)'PY
"!!41&NGY)R-0&J1Rr0&J1PY*)
A
;1
C
;12/9-1
; 5G

C,'O&,)'PY1)p'W1-1,1?@1&,2G,'&`&s&&o
&-F'1&U('1>,41/?,!&)0&)&,)$&&, '!L H

C
A

A,R5G C
 
,R5G ,R5G D
 
,R5G
?$&b"#,-&,&RO'3P
t
,
K
1&,
f
)1&u
v
S,1)-2'L('1,R5G] ?$&
b"#,-'PY!11)-&W/
A,R C,R ,R D,R
41?$0%& 2 ! "#$%&'()*)+/e;
w
01

C,'O41',1
'W1-2$R+1!41 /\!
f
'J
K
/[
f
0&J1'g)x;^)_6-_*)&1!)>,]),(
1>,41/
A,R5G


C,R5G

,R5G

D,R5G

,)'h,4 ! "#$%&e

e

',1#,-'V1+1PY&)3*)('1!
f
ω

ω






m,G$k+#,-&i0&J1'$10Fc&,
v
&"
K
&!'h,R%&!&,2G, J
K
0&!,
v

1&[
t
)1),
1=
f
&,)'u
z
,!
f

t
1('1ω/,
t

Aω;
 
   
e e
e e
+
ω + ω
Cω;
   
 
e e
e e
ω + ω
+
ω;
   

 
e e
e e
ω + ω
+
Dω;
   
 
e e
e e
ω − ω
+
#,-'3#,& +('.&{&U ')F b$'.&$&+#,-{0&!`1
|
A'/*1),(&P*1 &i&['/*1),(!6&O
C'/*1),(&P*1 ?@1'/*1),(!6&O
'/*1),(&P*1 /*&['/*1),(!6&O
D'/*1),(&P*1 ?@1'/*1),()_6-_

&!'V&.(1&"!&N)1),>, ?$&b"&P&U&q]
#,-'PY>,?$&b"!1`&N)1),&-F'1/
A,R C,R ,R
D,R
cTL1&$)1&}2 'h,?'O#,-#,&+('.&>,*)1),(10&J1'g)S,
G2'h,#,-'PY 1,R] 'h,#,-'PY!1G)_6&"!/
A,R C,R ,R D,R
 &,& W1 'V1 &9  &)3 R) X2 0&() /PY1 2 #,- #,&  + Z #, 1')F  
J1 1 *) &,& &! ! " #$ %& >, &,& '() *) + Z /





l
 ] &9')F 0&()
/PY1


! 'O&,&! "#$%&>,&o'()*)+Z/
A




l
C




l
 




l
D





l
!)c$)<9/ #`O'V1&90&()/PY1 ;2


012?$0%&~;0  ! "
#$%&'()*)+Z#, /


~

89-:;2! "'1/PY1>,c$)<9!1&-F'1
#,-b1#,&+Z*)&0U1)N21)$.?@1
A2


01

5G C2


01

5G 2


01

5G D2



01

5G
=
f
 ! "#$%&201

#,-'341!1G ! "'1/PY1>,'
/*/
A01

5G C01

5G 01

5G D01

5G
! "/\$R+1/+#,-('.&1)$.
•l,R5Gm


 
lGm


A0&J1'g)0&$0&J1&U/J/ #,-'3 CRP[1&U/J/ #,-&,&RO
 &U/J/ #,-& RO D?@10&J1&U'W1-&!j#,-'3
E&P[1U&>,!L'1€&"!&N)1),!RP*)'- J` &-F'1#,-& RO'3

>, #,-#,&+('.&21PY&)3RP[1H
A €;w•w

l,Rm C€;w•

l,Rm €;www

l,Rm D
€;•w

l,Rm
',1#,-&"! &)3#,& +('.&c('1>,L)&,)&N)')F 

;
G

;G1)$./O/PY/
srad 5

=
ω
‚
srad 5

=
ω
]),(11?U&!10&!`1&N)
1),

ttt

−=∆
1)$./?,!&)H
A,R5G

 C,R5G

 2,R5G

 D,R5G


Một vật rắn quay xung quanh một trục với gia tốc góc không đổi . Sau thời gian t kể từ lúc bắt đầu
quay , số vòng quay được tỉ lệ với
A. t
2
B. t C. t
3
D.
t

Một vật rắn chuyển động quay quanh một trục với toạ độ góc là một hàm theo thời gian và có dạng :

t
=
ϕ
( rad; s ) . Tốc độ góc của vật tại thời điểm t = 2s là :
A. 3 rad/s B. 6 rad/s C. 24 rad/s D. 12 rad/s
Dùng một ròng rọc có dạng một đóa tròn có khối lượng không đáng kể , có bán kính R = 50cm . Dùng
một dây không dãn khối lượng không đáng kể vắt qua ròng rọc . Hai đầu dây treo hai vật m
1

= 2kg , m
2
=
5kg .Mômen lực tác dụng lên ròng rọc là :
A. 10N.m B. 25N.m C. 35N.m D. 15N.m
$1J)G,!'PYG)&,T&p10&()0&%/*#,-& !RO&F%&/L)R!$R+1>,/\&96
Rƒc('1>,G,!
A0&J1'g) C=1/ 1)` ') D?@1
',1#,-#,& +('.&')#,2 ')F b$'.&k$&+#,-
0&!`1|'/*(R)/ &@1G(c%&&9&-F'1>,'/
A#,-& ROC#,-'3#,-?)_'g)'3D#,-&,&RO
1PN)0&()/PY1 'W1k  G4+#,-&a1'W1„&N)')F ;1PN)
'?'O&-F'1'3&"!6&P[1?$0%&T , …61!)>,G*)('()*)GC)_
G4#,-*)('1
ω
0&J1'g)c%&'1=1>,1PN)'!1#$U&1PN)',1&-F
'1H
A†
R
;

m
l•
ω
m

C†
R
;


m
l
ω
m

†
R
; 

5 D†
R
;

m
l

•

ω




m
?$&b"?'O#,-&,&RO'3lTL1&$)1&}m#,& +('.&>,S,G0FT
/7?'O#,-2(1?@1,R5G‡(1>,?$&b"G,G0FT/7?'O#,-?@1
A,R5GC,R5G,R5GD,R5G
?$&b"',1#,-*)('1,R5G&U?.&r C$&b"#,-& RO'3*)1),(1'
/*,R5G]#,-'PY>,?$&b"0FT/7&r '_/7RT1&a/
A,RC,R,RD,R

?$&b"'PN10%& #,-*)1),(10&J1'g),R5G

2

;//7?$&b"?'O#,-
]),(&P*1 >, ')F E&?$&b"k&N)')F ;G/
A 5G

C 5G

 5G

D 5G


?$&b"&.$R+1>,  J "/\

0&J1'g)cg1>, J "

 J "/\ ,G$
1)$.?@1^ 0&J1'g)c!1G'O2(1>,?$&b"?)_'g)T,R5G'_,R5G! "
#$%&>,?$&b"'()*)+/
Ae;01

Ce;01

e;01

De;01


,)0&()/PY1

;201

;201'PY()*)&,?@1 GY)R-&s20&J1Rr#,
41+#,-@ 1,1('.&1! …6?lU&m~41 ! "#$%&2
01

?$0%& !)@1R-0&J1PY410&)#,-Ci#, ) ,G$89-1;2 5G


]),(>,



/

A2 5G

C2 5G

2 5G

D2 5G


Cã 4 chÊt ®iÓm n»m däc theo trôc ox. ChÊt ®iÓm 1 cã khèi lng 2kg ë täa ®é – 2m, chÊt ®iÓm 2 cã khèi l-
îng 4kg ë gèc täa ®é, chÊt ®iÓm 3 cã khèi lîng 3kg ë täa ®é – 6m, chÊt ®iÓm 4 cã khèi lîng 3kg ë täa ®é
4m. Khèi t©m cña hÖ n»m ë täa ®é
A. – 0,83 m. B. – 0,72 m. C. 0,83 m. D. 0,72 m.

c$R+1  J "/\;2^ / #`O'j/ &!#`O#,-&,&RO'3*)1),
(1
γ
;,R5G

#,& +')#, >,#`Oˆ`O0&()/PY1 ;‰1C$0%&>,#`
O1)$./
A C  D2
?$&b"?$0%&2 2#,-TL1&$)'W1-*)1),(1
γ
;,R5G

&)3R)#h'L!>,
')F &?$&b"G,&N)1),G1)$./
A C2  D
&U&+'V1&9?$0%&; 20&()/PY1 ;012',1#,-#,&+'()bW1>,*)
('114156&7<F&U&+RT1/L)G,G0FT0&)$R+1!+  J "&r </*
>, J "&r /
Aπ^  2π^  Cπ^  D2π^  Š
#`O'j2'V1&920&()/PY12?$0%&~! "#$%&>,#`O'()*)+#,-
$& #`O '!L
~

/
Ae;


~

 Ce;



~

Š e;


~

 De;


~


! "#$%&>, &9')F '()*) +#,-&,-'g)&_!0&)0&()/PY1>,1)` ')
n,0&!`1$&T&9')F '_+#,-=1196'J)H
A])` 4 6&OP C])` 4 n, ‰&J1'g) Dc=1196'J)Š
c ',1#,-#,& +('.&')#,&,)')F AC‰&!`1$&TA2C*)
+#,-/O/PY/cL) &N)')F 21)p,(R)l
A
2
C
m2('1l
A2 C
ω ω
m1),(&P*1
 l,
A
2,

C
m>,&71 ()/)&o&PG,
A
A C A C A C
  ‚  ‚, ,
ω ω
= = =
 C
A C A C A C
  ‚ ‚, ,
ω ω
= = =


A C A C A C
  ‚  ‚
ω ω γ γ
= = =
  D
A C A C A C
  ‚ ‚, ,
ω ω
= = =

'1)&`-Ob(1P*Ci#,GW`>,0&J10&%2'L)/PY1!G,'-0&J1&,-
'g)0&)1PN)'',1&!/0&J1H
Ac&_=1>,1PN) C<1=1#,->,1PN)#,&+')#,
0&() 
J "#$%&>,1PN)'()*)+#,-')#,0&() DJ "'1/PY1>,1PN)'()*)
0&() 

‡&W&9#,-#,&+('.&∆

 ! "'1/PY1/8

2 ! "#$%&'()*)+∆


/e

;01

‡&W&,)#,-#,&+('.&∆

 ! "'1/PY1/8

2 ! "#$%&'()
*)+∆

/e

;01

C)_'1=1#,->,&,)/?@1&,cU }G(8

58


A




C







D




×