1. Solids Definite Shape and definite volume!

2. Solids Structure Structure Density Density Properties Properties

3. Structures Crystalline Crystalline –Regular geometric patterns pattern repeats over and overpattern repeats over and over Amorphous Amorphous –Random particle arrangement Examples... Examples...

4. Density Mass density: d = mass/volume Mass density: d = mass/volume –Determined by the mass of atoms and the spacing betw. atoms Weight density: D = weight/volume Weight density: D = weight/volume Units: g/cubic cm ; newtons/cubic meter Units: g/cubic cm ; newtons/cubic meter

5. Properties of solids... Malleability Malleability Ductility Ductility Brittleness Brittleness Thermal expansion/contraction Thermal expansion/contraction Elasticity Elasticity

6. Malleability The ability of a solid to be pounded into a thin sheet. The ability of a solid to be pounded into a thin sheet. Examples... Examples...

7. Ductility The ability of a solid to be drawn into a wire. The ability of a solid to be drawn into a wire. Examples... Examples...

8. Brittleness The property of a solid to fracture under force or pressure. The property of a solid to fracture under force or pressure. Examples... Examples...

9. Thermal Expansion/Contraction The ability of a solid to change its length as its temperature changes. The ability of a solid to change its length as its temperature changes. Examples... Examples...

10. Elasticity The ability of a solid to return to its original shape after being deformed by force. The ability of a solid to return to its original shape after being deformed by force. Examples… Examples… Hooke’s Law Hooke’s Law

11. Hooke’s Law The direct relationship between the restoring force of an elastic solid and the displacement from the rest position. The direct relationship between the restoring force of an elastic solid and the displacement from the rest position. F = K x F = K x

12. Elastic limit Some elastic materials can only be stretched to a certain point, beyond that point, the elastic properties go away- Some elastic materials can only be stretched to a certain point, beyond that point, the elastic properties go away- The elastic limit is the point at which an object will no longer return to its original shape. The elastic limit is the point at which an object will no longer return to its original shape. Examples... Examples...

14. Hooke’s Law Laboratory In this lab we will investigate the relationship between the stretching force and the displacement from the rest position. Then we will determine the period of oscillation for the spring oscillator. In this lab we will investigate the relationship between the stretching force and the displacement from the rest position. Then we will determine the period of oscillation for the spring oscillator.

15. Assignment... √ Density Worksheet √ Review Questions 1-11 (text book) √ Skillsheet 18-1 √ Hooke’s Law Lab Report √ Solid quiz