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EXPERIMENT: Mechanics

AIM: To determine the density of a 1 cent coin.

THEORY: The density of a sustance is the ratio of the mass to the !o"ume of the sustance.

#ensity In other terms is mass $er unit !o"ume. Therefore the formu"a for density can e found

usin% the formu"a: #ensity &'( ) Mass* +o"ume. #ensity. If the density of an o,ect is "ess than

the density of the "i-uid it is $"aced in the o,ect /i"" f"oat. Ho/e!er if the density of the o,ect

is %reater than that of the "i-uid it /i"" /in0.

+ARIA2E3: 4ontro""ed5 4oin #is$"acement 4an Amount of $a$er c"i$s used for each $art of

the e6$eriment &Amount $"aced on the tri$"e eam a"anced must e e-ua" to the numer $"aced

in the dis$"acement can(

Mani$u"ated: 7ater

Res$ondin%5 7ei%ht and +o"ume #ensity

APPARAT83: #is$"acement 4an

199 One 4ent 4oins

199cmMeasurin% 4y"inder.

7ater

Tri$"e eam a"ance

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METHO#:

1. A 199 $a$er c"i$s /ere $"ace on the tri$"e eam a"ance to otain its /ei%ht

;. The tota" /ei%ht otained /as then di!ided y 199 to otain the readin% of one $a$er c"i$. A dis$"acement can /as then fi""ed /ith /ater and /as a""o/ed to drain a"" the e6cess

/ater com$"ete"y.. After a"" the /ater /as a""o/ed to dri$ out the readin% of the measurin% cy"inder /as

ta0en and di!ided y 199.

#ia%ram

ReadiCoins

Pointe

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#IA?RAM 3HO7IN? METHO# O@ @IN#IN? THE +O28ME O@ 199 4OIN3 EIN?

83IN? A #I3PA2EA4MENT 4AN.

199 coins

The +o"ume Of 199 Pa$er4"i$s After A"" 7ater Has

een #ri$$ed

199 cmMeasurin%

4y"inder

7ater #ri$$in% Into

Measurin% 4y"inder

#is$"acement 4an

Ta"e 3tands

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RE382T3:

TA2E 3HO7IN? THE #EN3ITY AN# THE #EN3ITY O@ A 1 4ENT 4OIN

No. of 14ent coins Volume/c

m3Mass*% Density

g/cm3

199 ; 1 B.

1 9.; 1. B.

4A2482ATION3: +o"ume of 199 1cent coins ) ;

+o"ume of 1 1cent coin ) ;*199

)9.; cm

Mass of 199 1cent coins ) 1

Mass of 1 1cent coin ) 1*199

) 1. %

#ensity of 1 one cent coin ) Mass*+o"ume

) 1. %*9.; cm

) B. %*cm

PRE4A8TION3:

1. The 1 cent coins /ere $"aced on the centre of the tri$"e eam a"ance to otain a more

accurate readin%;. A"" the /ater /as ensured to ha!e drained out com$"ete"y from the dis$"acement can

efore $"acin% the coins.

. The coins /ere $"aced into the dis$"acement can %ent"y to ensure that the /ater didnCt

s$"ash or caused any /a!es that /i"" $ush more /ater out of the can

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>. 7hen readin% the measurin% cy"inder It /as ensured that it /as restin% on a f"at surface

D. The ottom of the meniscus /as read and $ara""a6 error /as a!oided.

3O8R4E3 O@ ERROR:

1. En!ironmenta" /ind /as $resent /hich /ou"d ha!e s"i%ht"y o/ed the /ater.;. A"" the /ater mo"ecu"es /ou"dnCt ha!e drained out com$"ete"y. 3ome /ou"d ha!e s"ic0ed

onto the s$out.

. The can /as s"i%ht"y !irated due to sha0in% of the surface.