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Ch 09: Work and Kinetic Energy
Chapter 9, Problem 9

FIGURE EX9.20 is the force-versus-position graph for a particle moving along the x-axis. Determine the work done on the particle during each of the three intervals 0–1 m, 1–2 m, and 2–3 m. Force versus position graph for a particle along the x-axis, showing intervals for work calculation.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Work Done by a Force

Work is defined as the product of the force applied to an object and the distance over which that force is applied, specifically in the direction of the force. Mathematically, it is expressed as W = F × d × cos(θ), where θ is the angle between the force and the direction of motion. In the context of a force-versus-position graph, the work done can be calculated as the area under the curve for the specified intervals.
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Area Under the Force-Position Graph

The area under a force versus position graph represents the work done on the particle as it moves through a given distance. For linear segments, this area can be calculated using geometric shapes such as rectangles and triangles. The total work done over multiple intervals can be found by summing the areas of these shapes for each interval, providing a clear method to quantify the work done.
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Intervals of Motion

In this context, intervals refer to specific segments of the particle's motion along the x-axis, defined by their position ranges (0–1 m, 1–2 m, and 2–3 m). Each interval may have different forces acting on the particle, which affects the work done during that segment. Analyzing each interval separately allows for a detailed understanding of how the force varies and how it contributes to the overall work done on the particle.
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