1. Physics 1100 - Fall 20111 Solids Crystal Structure Density Elasticity Tension and Compression Scaling

2. Physics 1100 - Fall 20112 Classification of matter? – Elements, – compound, – mixture,... Three (actually 4) states of matter. – Solid- fix shape, fix volume – Liquid- shape container, fix volume – Gas- shape container, volume container The Essence of Matter

3. Physics 1100 - Fall 20113 Crystal Structure Diamond (Carbon)

4. Physics 1100 - Fall 20114 Crystal Structure water ice

5. Physics 1100 - Fall 20115 Density Mass Density = Mass/Volume Weight Density = Weight/Volume Units are Kg/m 3 Water density is 1000 Kg/m 3 or 1 g/cm 3

6. Physics 1100 - Fall 20116 Elasticity F ~ -  x Hookes Law: Tension and Compression Tension Compression

7. Physics 1100 - Fall 20117 Scaling

8. Physics 1100 - Fall 20118 Scaling

9. Physics 1100 - Fall 20119 Class Problems 1. Compared to a bar of pure gold, the density of a pure gold ring is A)slightly more. B) the same. C)less. D)much more. 2. If the volume of an object were to double while its mass stays the same, its density would A)halve. B)stay the same. C) double. D) become four times as great. 3. Stone slabs are stronger under A)tension. B)compression. C)same strength.

10. Physics 1100 - Fall 201110 Class Problems 4. A metal block has a mass of 5 grams and a volume of 1 cubic centimeter. A piece of the same kind of metal with a volume of 2 cubic centimeters has a density of A)2.5 g/cc. B)5 g/cc. C)10 g/cc. 5. Eight little spheres of mercury coalesce to form a single sphere. Compared to the combined surface areas of the eight little spheres, the surface area of the big sphere is A)less. B)greater. C)the same.

11. Physics 1100 - Fall 201111 Class Problems 6. An elephant eats less for its size than smaller animals because A) its radiating area is small compared to its volume. B) its ears are bigger. C) its radiating area is large compared to its volume. D) it is taller than other animals. E) it weighs more than smaller animals.