| In a transmission, where all gears are constantly in contact and turning with one another. | |
| Engine coolant temperature sensor | |
| Balancing a part while it is in motion. | |
| In mechanical terms, wear of a component that exceeds designed limits; wear causes by overloading a part that is in an out-of-balance condition, resulting in lower-than-normal life expectancy of the part being subjected to the adverse operating condition. |