Discussion
While using hand tools; the contact stress results from :
Answer: D
Contact stress with hand tools results from hand hammering.
Contact stress is the pressure of a hard or sharp object on a small area of the body. Using the palm or heel of the hand as a hammer, to strike a tool or press parts together, concentrates force on nerves and blood vessels in the hand and is a recognised ergonomic risk.
Repetitive operations and hand movement cause repetitive strain rather than contact stress, and sitting with adequate knee room is good ergonomic practice, not a hazard.
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