Which physical quantity represents the area under the force displacement curve ?

Explanation

To determine which physical quantity represents the area under the force-displacement curve, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Force-Displacement Curve**: The force-displacement curve is a graphical representation where the x-axis represents displacement (s) and the y-axis represents force (f). The area under this curve between two points (A and B) is what we need to analyze.

2. **Identify the Area Under the Curve**: The area under the force-displacement curve from point A to point B can be visualized as a series of infinitesimally small rectangles. Each rectangle has a height equal to the force (f) at that point and a width equal to an infinitesimal change in displacement (ds).

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