Human Factors & Biomechanics Flashcards
6 cards from real CES practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Human Factors & Biomechanics flashcards as text
What does 'force-velocity relationship' mean in muscle biomechanics relevant to ergonomics?
Answer: Muscles produce less force as contraction speed increases
The force-velocity relationship shows that concentric muscle force decreases as contraction velocity increases, which is relevant when designing high-speed repetitive tasks.
Which posture assessment tool assigns a score based on upper arm, lower arm, wrist, neck, trunk, and leg positions?
Answer: REBA (Rapid Entire Body Assessment)
REBA evaluates whole-body posture by scoring upper limb, neck, trunk, and leg positions, then combines scores with load, coupling, and activity factors.
In ergonomics, what does 'pinch grip' refer to and why is it a concern?
Answer: Holding objects between thumb and fingers, which requires high muscle force relative to grip strength
Pinch grip uses only the thumb and one or more fingers, generating significantly less force efficiency than power grip and increasing tendon and muscle loading.
What is 'psychophysical methodology' used for in ergonomic research?
Answer: Determining acceptable work load limits based on worker perception of effort
Psychophysical methodology establishes acceptable work limits by having workers adjust task demands until they feel they can sustain the effort across a work shift.
Which condition involves inflammation of the tendon sheath and is common in jobs with forceful, repetitive hand movements?
Answer: Tenosynovitis
Tenosynovitis is inflammation of the synovial sheath surrounding a tendon, frequently caused by forceful and repetitive hand and wrist movements in industrial or office settings.
What does the term 'recovery time' mean in the context of work-rest cycles for ergonomic task design?
Answer: Time allowed for muscles to recover between exertions to prevent fatigue accumulation
Recovery time refers to rest periods incorporated into task cycles that allow muscles to replenish energy and clear metabolic by-products, preventing cumulative fatigue.