<Dd> Ergonomic hazards are physical conditions that may pose risk of injury to the musculoskeletal system, such as the muscles or ligaments of the lower back, tendons or nerves of the hands / wrists, or bones surrounding the knees . Ergonomic hazards include things such as awkward or extreme postures, whole - body or hand / arm vibration, poorly designed tools, equipment, or workstations, repetitive motion, and poor lighting . Ergonomic hazards occur in both occupational and non-occupational settings such as in workshops, building sites, offices, home, school, or public spaces and facilities . </Dd> <Dl> <Dt> Mechanical hazard </Dt> </Dl> <Dl> <Dd> A mechanical hazard is any hazard involving a machine or industrial process . Motor vehicles, aircraft, and air bags pose mechanical hazards . Compressed gases or liquids can also be considered a mechanical hazard . </Dd> <Dd> Hazard identification of new machines and / or industrial processes occurs at various stages in the design of the new machine or process . These hazard identification studies focus mainly on deviations from the intended use or design and the harm that may occur as a result of these deviations . These studies are regulated by various agencies such as the Occupational Safety and Health Administration and the National Highway Traffic Safety Administration . </Dd> </Dl> <Dd> A mechanical hazard is any hazard involving a machine or industrial process . Motor vehicles, aircraft, and air bags pose mechanical hazards . Compressed gases or liquids can also be considered a mechanical hazard . </Dd>

When does a hazard lead to disaster wikipedia