Tensile stress and strain: The graph in the figure shows the force on an object as a function of the elongation caused by that force. Which statement about this object is true?
A) The object obeys Hooke's law at all points from A to C.
B) The object obeys Hooke's law at all points from B to C.
C) The object obeys Hooke's law at all points from A to B.
D) The elastic limit occurs at point C.
E) The region of elastic behavior occurs from B to C.

Question

Tensile stress and strain: The graph in the figure shows the force on an object as a function of the elongation caused by that force. Which statement about this object is true? 
A) The object obeys Hooke's law at all points from A to C. 
B) The object obeys Hooke's law at all points from B to C. 
C) The object obeys Hooke's law at all points from A to B. 
D) The elastic limit occurs at point C. 
E) The region of elastic behavior occurs from B to C.

Quizplus · Accepted Answer

Hooke's law states that the force applied to an object is directly proportional to the elongation of the object, as long as the object remains within its elastic limit. In the given graph, the region from A to B is linear, indicating that the object is following Hooke's law within this region. However, beyond point B, the graph starts to curve, indicating that the object is no longer following Hooke's law and has surpassed its elastic limit. Therefore, the best choice is C, which states that the object obeys Hooke's law at all points from A to B.

Tensile Stress and Strain: the Graph in the Figure Shows