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PHYS 135A
HOMEWORK
I
INTRODUCTION
TO MOTION
Distance(Position)'Time
GraPhs
Answerlhe
lollowing
questions in lhe spaces
provided.
- Whatdoyoudo 1ocreate
a horizontal
lineon a dlstance-time
graph?
Howdo youwalkto cr€atea straightline
that slopes
up?
Hpwdo
you walkto createa straight
line
thai slopes down?
Howdo youmove sothegraph
goesup
steeplyat first,andlhencontinuesup
s f r r r / i l p )
Howdo youwalkto createa U-shaped
rqea'l
H
A'rre,th'oo,
--.-*T]m'?
D I t D I s t
z -
D I s I D i s t
U
t
t
O f t a t n
Lt
T i m e
l l ' \ l
*lrt.rq l^ {he 6t1Y:J-
t)
5E
Sketchthedistance(position)-timegraohcorresoon.tin!
rn :ach c! 1!:elcllowing
descriptionsof the motion ol an object.
9- The objeclmoves wilha steady(constant)
velocity away lromtheorigin.
0
I
!
I
n
c o
e D i s t n
c o
I
i0. The
objectis standing stilt.
1'l. The object
moveswitha steady(constant)
velocity towardthe origin lor 5 secondsand
thenstands still for5 ssconds.
D
i
- The object moveswitha steady velocity
awayfrom lheoriginfor5 seconds, then
reversesdireclion andmovesat the same
speedloward theoriginfor 5 seconds.
- The obiectmoves aw2-vlromihe
origin, startingslowlyandspeeding
up.
D
j
3
n
c o
I
T i ri €(sec)
l,.lotbn and Force5,
o1987-90CSMT
TuttsU.
D
I
s
i
a
c o
I
ools lor Scisntnc Thinking
omeworl-lntroduclbnlo llotbn
c o
T
inio(sec)
H-
Sketch,yel€eittffie the velocity
-time
graph
conespondingto eachof thefollowing
descriptionsof lhe motionof an obiect.-
- Theobjectis movingawayfrom
theorigin at a steady(constant)
velocitv.
B.Theobject is standingstill.
9.Theobject moves towardth€
originat a steady(constant)
velocity for 10seconds, andthen
standsstill 1or
seconds.
10.Theobject moves awaylromlhe
origin al a steady(constant)
velocitylor 10 seconds, reverses
direclion andmovesbacktoward
theorigin at thesamespeed for
10 seconds.
o I e I s I € I
Toolslor ScientilitThinking
H-
Motbn and Fofcs 5/
- Draw thevelocitygraphs foranoojectwhossmotionprociucedthedistance-lime'
graphs
shown bslowonthelett. Distance is in metersandvelocity
in metersper
second..
fl-hatis,thevelocity
isthe number ol meterstheobject
would
movein one
second.)
l{ole: Unlfte mosl realobjeds,you
can assume lhese objectsen changevebcityrc qu'rC<}y
t'al il boks inslantaneouswilh lhb lime scale.
D *
i 3
r 2
1
c r
r8l
o
Ioolslor Scienlfn Thinking
Homevroft-lntroductbn to t\rotbn
v - L
"
r l
I
' ^
o
c 0
i
r - 1
v
(nr's)-
l? 3 {
v
c
I
o
. Tirrie(sec)
Mot'|onand Forcs
5/
O1987-9O
CSMTTuflsU.
o,
. Ti:ab(sec)
(rrvsJ-/'-
I
-t
I
J
Timc(scr)
Y + 2
c
. 1
I
o
i-
t - l
v
(dt
Timc (scc)
Tirnc(sec)
H-
