Space Time & Motion A.3 Work Energy and Power (id: 251851f41)

本题目来源于试卷: Space Time & Motion A.3 Work Energy and Power，类别为 IB物理学

[单选题]
The graph shows the variation of length of a spring of original length $l_0$ as it is stretched to length $l$ by a variable force



The work done against the spring is represented by which of the following?

A. The area marked X.
B. The area marked Y.
C. The area marked Z.
D. The sum of the areas marked Y and Z.


参考答案:  A


本题详细解析:
Expianation:

Since $W = F \cdot s$, work can be found from areas on the graph. Because the axes are switched, the area must be found between using the length axis as the base. Only the triangular area contained between the graph and the length axis from $L$ to $L_0$ represents the work done.

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