| A | B |
|---|
| Concurrent | Forces acting at one point,  |
| Coplanar | Forces acting all on one plane |
Centroid,  | Center of area of an object |
| Stress | Force divided by area |
| Strain | Relative change in length |
| Deformation | Change in length |
| Tension | Force pulling on an object |
| Compression | Force pushing on an object |
Axial,  | Force acting along the axis of an object |
| Reaction | Force required for equilbrium of a beam |
Pin,  | Support that provides two restraints |
Roller,  | Support that provides one restraint |
| Moment | Force that tends to cause rotation |
Factor of Safety,  | Ratio of failure load to design load |
Equilibrium,  | Sum of all forces and moments equal zero |
