Ergonomics Flashcards

Which type of hand tool design best reduces wrist deviation during repetitive tasks?

Answer: Pistol-grip or bent-handle tool

Pistol-grip or bent-handle tools allow the wrist to remain in a neutral position, reducing ulnar or radial deviation stress.

What is the primary ergonomic concern with prolonged use of a computer mouse?

Answer: Ulnar nerve compression and shoulder strain

Extended mouse use can compress the ulnar nerve at the wrist and cause shoulder strain from reaching away from the body.

In the context of NSC ergonomics guidelines, what does 'neutral posture' refer to?

Answer: Body position where joints are not at extremes of their range of motion

Neutral posture means the body's joints are near the middle of their range of motion, minimizing stress on muscles and tendons.

Which ergonomic principle applies when a worker adjusts their workstation to fit their body rather than adapting their body to the workstation?

Answer: Fitting the task to the worker

Fitting the task to the worker is a core ergonomic principle that modifies equipment or processes to suit human capabilities.

A warehouse worker lifts boxes from floor level repeatedly. Which change would MOST reduce lumbar spine loading?

Answer: Raising the pallet to knee or mid-thigh height

Raising the starting height of the load reduces the forward trunk lean that dramatically increases lumbar compressive forces.

Which of the following best describes 'contact stress' in ergonomics?

Answer: Pressure on soft tissue from a hard edge or object

Contact stress occurs when a hard surface edge presses against soft tissue, restricting blood flow and compressing nerves.

According to NIOSH ergonomic recommendations, what is the maximum recommended weight for a two-handed lift under ideal conditions?

Answer: 51 lbs

The NIOSH Lifting Equation sets the recommended weight limit (RWL) with a maximum action limit of 51 lbs under ideal lifting conditions.