Define what stress is.
Define strain.
Explain the term elastic limit.
Explain the term ultimate tensile stress.
A ductile wire is pulled until it reaches breaking point. On Fig. 3.1, sketch how the stretching force $F$ varies with extension $x$.
On Fig. 3.2, sketch how $F$ varies with $x$ for a brittle material up to its breaking point.
Explain the graph features in (d) that demonstrate the properties of ductile and brittle materials.
The force $F$ is removed from the materials in (d) just before the breaking point is reached. Describe the change that follows in the extension for the ductile material.
The force $F$ is removed from the materials in (d) just before the breaking point is reached. Describe the change that follows in the extension for the brittle material.
The force $F$ is removed from the materials in (d) just before the breaking point is reached. Describe the change that follows in the extension for the ductile material.
The force $F$ is removed from the materials in (d) just before the breaking point is reached. Describe the change that follows in the extension for the brittle material.