PHYSICS 8A Lecture 8: Work and Energy, Springs and Hooke's Law
WORKTENERGY 6/28
-Work :atnnsraltromsformationoft
'
by mechanical means #reading thwa distance)
W-
.work ,w >0it [is transferred into object
w< 0if "Out of ' '
W=foru .distance #insane direction as displacement )
=-force .dist ("different ")
[Wftoukltfljofwisdombya IN force ×In
,
IF IN 'm
Wtoifforuis 1to displacement F
E=W=Fcosasr
^IE
W=F×Ax )o ×. xp
SF
'Fh
.Scalar Hot product )oF2 rates :yep -he
A. IFABCOSO
IFOEOEN
,
t.BNA.BA#.so)=AxcompotBalmgA
it 9041180 ,EBo =Bttasaf.Bxcomporaidayb (gdtsstpdvbtgtnwlds )
t.it#iityjAzkt.(BxitByItDtk)
it -0
,etc. ,
ij.l.1.us#=iik=j.E.so=AxBx+AyBytAeBzFW=FsrcosO=Fsr)0rWnet=slmofWbyMfary..fEw*Nfwus=EEsifEeE).sr=Fnet.Dr
-
ex :sx .
-sm
"Err stay
Wapp=Epptn⇒o MFO .1 #←f no
.
=2fN .fm .cost
.
-108J FISN,m=Gkg A
Wf=FkDv(05180 :-fkbr p<
btvxandg
tf=µn=Rsv→Wf=
-13
.sn#to8JWgrau=mgsrcos9o.=OEe+ytntEppsin30img=MAy=o
Wn=nDrcos9Oi0
n=mgtappsin30t3sN
WMEEFWH
408+014-68=405
