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UNDERSTANDING THE EFFECTS OFA FORCE

31th March 2010Miss Noor Syafqah Moh I ris

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!HAT IS FORCE"

#$ts try this acti%ity1& Ho' o yo( 'a)t to *o%$ this

tro++$y",(sh th$ tro++$y OR,(++ th$ tro++$y

A -orc$ is a push or a

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!hat o yo( )$$ to .)o' 'h$)yo( /(sh or /(++ a) o $ct"

1&Th$ strength or magnitude o-yo(r -orc$

2&Th$ direction i) 'hich yo( ar$/(shi) or /(++i)

Forc$ is a %$ctorq(a)tity

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move

Changetheshape

Slo

w Change

Keepbalanced

!hat-orc$s

o"

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A#ANCED 4 UN A#ANCED FORCES

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A#ANCED FORCE OF AN O 5ECT

a+a)c$ -orc$ o )ot cha) $ th$ stat$ o-r$st or th$ stat$ o- *otio) o- a) o $ctA) o $ct is sai to $ i) balanced 'h$)

i) a statio)ary stat$ or )ot *o%i) *o%i) at ()i-or* s/$$ or %$+ocity

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UN A#ANCED FORCE OF AN O 5ECT

U) a+a)c$ -orc$ is 'h$) th$ -orc$sacti) o) a) o $ct is )ot a+a)c$U) a+a)c$ -orc$ ca) a o y to

Cha) $ its stat$ o- r$stCha) $ its stat$ o- *otio)Acc$+$rat$

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RE#ATIONSHI, ET!EEN FORCE6 MASS ANDACCE#ERATION

!hat is acc$+$ratio)"Rat$ o- cha) $ o- %$+ocity

a = v u

t

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SITUATION 1 7 o)$ /$rso) /(shi) a *ass *6 th$) t'o/$rso)s /(shi) th$ sa*$ *ass&

8UESTION 7 !hat ca) yo( -$$+ or o s$r%$"

O SER9ATION 7 !h$) /(shi) th$ *ass 'ith t'o /$rso)s6th$ tro++$y -ast$r6 th(s i $r acc$+$ratio) &

CONC#USION 7 acc$+$ratio) is /ro/ortio)a+ to th$ -orc$&

(acceleration) a F (netforce)

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SITUATION 1 7 o)$ /$rso) /(shi) a *ass *6 th$) th$ sa*$/$rso) /(sh t'ic$ o- th$ *ass6 2*

8UESTION 7 !hat ca) yo( -$$+ or o s$r%$"

O SER9ATION 7 !h$) /(shi) th$ i $r *ass th$ tro++$y*o%$ s+o'$r6

th(s s*a++$r acc$+$ratio)&

CONC#USION 7 acc$+$ratio) is i)%$rs$+y /ro/ortio)a+ to th$*ass (acceleration) a _1_

(mass)

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RE#ATIONSHI, ET!EEN FORCE6 MASS ANDACCE#ERATION

aF

a _1_m

Therefore, a F/m ,

F ma Therefore, F = kma k=constant1 )$'to) :F ; 1 N< is $f)$ as th$ -orc$

r$q(ir$ to /ro (c$ a) acc$+$ratio) o- 1 * s =2 :a;1 * s =2< 'h$) its acti) o) a) o $ct o-

*ass 1 . : * ; 1 .

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E>AM,#E

Ca+c(+at$ F6 'h$) a ; 3 * s =2 a) m ; 1000.

F = ma 1N = 1 kg ms -2

F = (1000 kg)(3 ms -2 )

F = 3000 kg ms -2F = 3000 N

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DO E>ERCISE ON TE>T OO@ ,AGE 3:2&? 8UESTIONS< NO!&

ANS!ER A## 8UESTIONS&