Which of the following statements about shear stress are true? (Select all that apply) Select 2 correct answer(s) Question 28 options: It occurs when forces are applied parallel to the surface of an object It causes layers of material to slide past each other. It happens parallel to the normal stress It occurs when forces are applied perpendicular to the surface of an object
Question
Which of the following statements about shear stress are true? (Select all that apply)
Select 2 correct answer(s) Question 28 options:
It occurs when forces are applied parallel to the surface of an object
It causes layers of material to slide past each other.
It happens parallel to the normal stress
It occurs when forces are applied perpendicular to the surface of an object
Solution
Para responder a la pregunta, primero debemos entender qué es el esfuerzo cortante (shear stress) y cómo se manifiesta. El esfuerzo cortante ocurre cuando fuerzas son aplicadas de manera que tienden a deslizar las capas de un material una sobre otra.
Analicemos cada opción:
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"It occurs when forces are applied parallel to the surface of an object": Esta afirmación es correcta. El esfuerzo cortante se produce cuando las fuerzas actúan paralelas a la superficie del objeto.
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"It causes layers of material to slide past each other": Esta afirmación también es correcta. El esfuerzo cortante provoca que las capas del material se deslicen unas sobre otras.
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"It happens parallel to the normal stress": Esta afirmación es incorrecta. El esfuerzo cortante ocurre en un plano paralelo a la superficie, mientras que el esfuerzo normal actúa perpendicularmente a la superficie.
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"It occurs when forces are applied perpendicular to the surface of an object": Esta afirmación es incorrecta. El esfuerzo cortante ocurre cuando las fuerzas son paralelas a la superficie, no perpendiculares.
Por lo tanto, las afirmaciones correctas son:
- It occurs when forces are applied parallel to the surface of an object
- It causes layers of material to slide past each other
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