PHYSICS 8A Lecture Notes - Lecture 6: Friction, Varangian Runestones
6126
-
ex :caracal .to the R-not force from engine ,
but static friction
-0M¥
.Newton's 3"
law :for any action
,
there's an =and opp .rxn
-ex : rocket ←D- Overall →force bk of pressure on lank ex .backwards
sexiness.Eiffel
;F÷tfEEyef¥I÷y¥Iiw÷÷¥E÷¥r
E. =I.niIar
.
-rxa×T"9. '9
→Typnrttbgnr
Ionr -Bar -0
Trone ±Trois
-
ex :no fnit
,
I
,ma ,m . given ,
Finl Tz and Aftab
¥#
f÷sEm
.ftp.It.FM#=IkEetx=TTz=maaT-mBa*tn.a-
⇒a×=m¥s
,
Hiv ,Tjmgax ⇒MBTYMATMB
a""i
Ee Ee.i=T,=HatmAax
th A×=T/m#m$ ,
no Tz
(internal fovu)
.Pulleys :tensions on either side not always =
tensions same if :
"nrismaesm ,f9gTF¥t
.tt#mmgtImknI
,
⇒no Friction 2) Eety =T,
-
mgtmzay .
3) pulley is masskts 3) Aye '
Ay ,
→Imzg =mz9yi
subtaith
-21 →F-
mid .A-mid -
.may ,
-fmiy ,
)
mzg -m,g=m,a ,,tmzay .
g(m -mltglm ,
+
md →ay ,
=mI
Mztm ,
note :M,
and mzhnu different Vs
,
so can't use 1FBD for both .
