This document discusses elasticity and Hooke's law. It notes that some materials like rubber and springs change shape when a force is applied but return to their original form, while other materials like plastic or wood may break or not return to their original shape if the force is too strong. It asks questions about what happens if more force is applied to rubber or a spring. It introduces Hooke's law and provides an example of how to use it to calculate how much a spring would stretch under different masses.

1. ELASTICITY AND HOOKE’S LAW

6. How do we know the elastic limit? Experimental result: force surface area increase in length

7. Hooke's law