California Certified Nursing Assistant (CNA) Practice Exam

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Prepare for the California CNA Test. Study with flashcards, multiple-choice questions, hints, and explanations. Get ready to ace your exam efficiently!

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What term describes the action when two surfaces rub together?

Friction
Shearing
Pressure
Ergonomics

The correct answer is: Friction

The action when two surfaces rub together is known as friction. This term refers to the resistance that one surface or object encounters when moving over another. Friction is an important concept in various fields, including physics, engineering, and healthcare, as it significantly influences movement, stability, and wear between surfaces. In a healthcare context, understanding friction is essential when assisting patients with mobility, as it can affect the prevention of skin injuries, like pressure ulcers, especially in those who are immobile. Other terms presented, such as shearing, pressure, and ergonomics, relate to different concepts. Shearing typically refers to the force that acts parallel to a surface and is significant in discussions about skin integrity and injuries, particularly in bedridden patients. Pressure pertains to the amount of force exerted over a specific area and is commonly associated with pressure ulcers. Ergonomics deals with designing tasks and workspaces to fit the user's needs, aiming to optimize human well-being and overall system performance. While all these concepts are interconnected in healthcare, friction specifically describes the interaction between two surfaces.