# Materials Notes

This is a sample of our (approximately) 3 page long Materials notes, which we sell as part of the Physics AS Level Notes collection, a A package written at Manchester High School For Girls Sixth Form in 2013 that contains (approximately) 36 pages of notes across 13 different documents.

### Materials Revision

The following is a plain text extract of the PDF sample above, taken from our Physics AS Level Notes. This text version has had its formatting removed so pay attention to its contents alone rather than its presentation. The version you download will have its original formatting intact and so will be much prettier to look at.

Unit 2: 11 Materials

DENSITY Volume of; i). Regular solids - height x volume x depth ii). Irregular solids - submerge it in a known volume of watch

- calculate the volume based on water displacement Materials of uniform density Density (kgm-3) = mass (kg)

volume (m3)

or ρ=m/v

Materials of non-uniform density - alloys mass = ρAVA + ρBVB (where P = density and V = volume)

Density of Alloys (kgm-3);

ρ = ρAVA + ρBVB

(method works for 2 or more materials)

V

V

Worked Example; We have a sample of material that is 2.5x10-3m3 in volume. It is made of 2 metals, A and B. A is 80% of the volume, it has a density, (ρA) of 6x103kgm-3 B has a density, (ρB) of 2.5x103kgm-3 Calculate the mass of the sample and its density.

VB

VA = 2.0x10-3m

m

=
=
=
=

ρ

= m/v

= 5300kgm-3

= V - VA
= (2.5x10-3) - (80% x 2.5x10-3)
= 2.5x10-3 - 2x10-3
&

VB = 0.5x10-3m

ρAVA + ρBVB (6x103 x 2.0x10-3) + (2.5x103 x 0.5x10-3) 12 + 5/4

13.25kg

=13.25/2.5x10-3

PHYSICS AS NOTES

25

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