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Summary PHYSICS MATERIALS A LEVEL NOTES
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in depth summary notes with diagrams and an organised presentation with all the information needed for the aqa specification for a level physics materials topic 11
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T11MATERIALS
, 15109/23
11 I . DENSITY
density of a metal and a Plastic :
↳
metals are usually more dense than plastics because they have more mass per unit
volume
DENSITY =
massperunit volume Density = measured in kym-s
VOLUME
Ligulds and Solid) are
work out the density of the cube : more dense than gases as
gases have an average
⑮, 4zm p Volume 2 x2 x2 8Cm3 separation between the
M
=
= =
W
-
t =
2gcm molecules greder than
mass= 169 sollds and Liquids
so have less mass
measuring the density of substances per unit volume .
A
regular solld an Irregular solld a 119Uld
cylinder
·
measure the mass using a measure mals on top panhalance measure mass of an empty measuring
·
top pan balance
·
submerge the object In allquid and record mass . then pour some liquid in and
measure the volume In a measuring cylinder and re-measure mass (use as much as possible to reduce the
·
using
bxnxw and using the vernier onserve the displacement of the uncertainty of measurement) calculate mass .
cullipers Liquid -
this is the volume
·
Read off the scale the volume of laud at eye
·
ale density equation . level to reduce paralax error .
Allous a mixture of at least 2 metall and is always a solld
=
e .
g .
copper and zirc make brass which is an alloy .
mass of an alloy M
=
·
=
MA +
MB =
(PAVA +PBVB) =
Mioral (Mass Of Alloy)
·
Density of Alloy =
M/V
=+PBVB) AVA+VS-density of the
Alloy
=
, worked example :
A Brass object consists of 3 .
3x10-ms of copper and 1 . 7x10-5ms of Zinc .
Calculate the mass and
density of this object density of copper 8900kgm-3 density of zIRC 7100kgm-s
:
=
=
,
10-5 x18-5 18- 5ms
AVA
V total volume 3 3 1 7 5
1
+ x x
+
= =
=
. .
V
8980 3 3x18-5
-5
7100x1 7x18 8288kgm 3
x +
-
.
. =
SX18-5 5x18-5
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