Goncept-Development
Practice Page
Racing Day with a = Flnr.
In cach siruation belo,,v, Cart A has a rnass of I kg. Circle the correct ansLuers (A,
I.
Cart A is pulled r,vith a I'orce of I N.
Cart B also has a nlass of r kg and is pulled
ivith a force of 2 N.
.=
o
:
2. C.art A is pulled rvith a force of I N.
\{Ihich undcrgoes thc greater accclcratiotr?
(A) (B)
(A) (B)
(A) (B)
iE
or Sarne lbr bottr).
Cart B has a mass of 2 kg and is also ptrlled
rvith a forcc of I N.
\Mrich undergoes thc grcater acccleration?
(Samc tbr both)
Cart A is pulled lrrith a lbrce of I N.
Cart B has a mass of 2 kg ancl is pulled r,r,ith
a lbrce of 2 N.
Which undcrgocs thc grcatcr accelcration?
'-
I3,
pullcd wittr
a
lbrcc of
I
N.
a lbrce of 3 N.
lVhich undcrgoes the grcatcr accclcration?
(Same lbr both)
0. Cart A is pulled rvith a force of 2 N.
Cart B has a nrass of 4 kg and is ptrlled rvith
a lbrcc of 3 N.
\Vhich undergocs the grcater acceleration?
(A) (B)
(Same for both)
for both)
Cart B has a mass of 3 kg and is pullcd rvitlr
(A) (B)
(Same for both)
This time Cart A is pulled r,r,ith a lbrce of 4 N.
Cart B has a rnass of 4 kg and is pullcd n ith a
lbrce of 4 N.
Which undergoes thc grcatcr accclcration?
(A) (B)
4. Cart A is
(San.re
(Samc for both)
E
o
thonx fo Dean Boird
CONCEPTUAL PHYSICS
Chapter
6
Newton's Second Lar,v of Motion-Force and
Acceleration 29
Drop and Pull
1.
Consider a I -kg cart being pulled by a 10-N applied tbrce. According to Ner,rrton's second law
acceleration ofthe cart is
a_F_10N-l0m/s2.
m 1kg
=ll
This ls the scme os the sccelerdtion of f r* fol!.5beccuse
force egual to the carfs weighf occelerotes it.
2. Considcr thc acccleration of thc cart rvhcn thc applicd force
is clue to a 10-N iron weight attached to a sl.ring drapecl over
a pullcil Will thc cart acceleratc as bclbrc, at l0 m/s3? Thc
answer is no, bccausc thc mass being accclerated is thc mass
Thc pullqv cfrit
rEu^r
a
,rnly
'\,
th* dir*,rtion of the ic.r'*.*. j'".
L^/i
of the cart p/as the mass of the piece of irou that pulls it.
Both rrrasses accelcrate. The mass of thc l0-N iron rrrcight is
I kg-so the total urass being acceleratecl (cart + iron) is 2 kg.
Then,
a- F-l0N_5m/s2.
m 2kg
Oon'tforget the total rnoscof asysfem
includ€., the tnsts of the holqin4 iron-
..
,,..
'1 i-
i$i[l
{L
-'r
}'.iats lh's rs hslf ths ssceieiatjsn duE ?o grs'rity ofuru, 3t- $*
r
ri
:$
f.i.r
.i r i:.-;a
t$r* <t*ct;*vcrsxn *t k5 produe*d foy f'hr wrigt'ri uf t @ i* SE-
E
t
o
'=
;
il. I;ind thc acccleration of thc I -kg cart whcn two
identical 10-N weights arc attachcd to the string.
a*
F _ appliedforce
ttt
total mass
-
m/s2
.=
o
c
:
{
o
@
CONCEPTUAL PHYSICS
30
Chapter
6
New,ton'.s Sccond Lar,v of
N{otion-Force and i\cccleration
Datc
Class
Namc
Drop and Pull-corrtinued
b. Find the acceleration of the
I-kg cart rvhen
thrcc identical 10-N wcights arc attached to the
string.
a*
t,
nl
-
appliedforcc
-
total mass
m/s2
Find the acceleration of the 1-kg cart when four identical l0-N weights (not shown)
are attachcd to thc siriug.
n
=
F
m =,
a}:Plied force
-
total mass
nr/s2
=
d. This time I kg of iron is addcd to thc cart, and only
one iron piece dangles frotrr thc pulley. Find the
acccleration clf lhc cart.
- F'
Dt
arlnlied forcc
total mass
m/s2
=
The farce duc to groyity on c rnos$ fi is fiig.
5o onavi?ctiotul
ioml forcr on I ka
rn/sz) == 16
kg is (1 ko)f10
k9)(10 tnls'J
<
51.
-g
.=
c.
Find the acccleration of the cart when it carries two picces of iron and only one iron piece
dangles from the pulley.
9
=
a_F_
m
applied force
total mass
-
ttt/S2
=
o
-
CONCEPTUAL PHYSICS
Chapter
6
Ner,rton's Second Larv of
Motion-Force and Acceleration 31
f.
Find the acceleration of the cart when it carries
3 pieces of iron and only ot.te ircln piecc dangles
tiom the pullet.
a* F tn
appliedforce
total mass
-
m/s2
=
-
o
F'ind the acceleration of the cart r,t'tren it carries
3 pieccs of iron and 4 pieces of iron dangle front
thc pullery.
,r- F m
applied tbrce
total r.nass
-
ttt/sl
=
-,
iAoss
of cort is t
kg. rtrtoss of lO-N iron is olso 1 kg.
h.
I)rarv your olvn combination of n.rasscs and
find the acccleration.
'-o
E
:E
:
.F
E
- l-' aonlicd ibrce
u=..--=
t?t total mass
=
-ntls2
CONCEPTUAL PHYSICS
32
Chapter
6
Newton's Second Law of N{otion-Force and Acceleration
o