When a spring is stretched, how much work is done by the stretching force?
Correct answer: A. Positive
- A. Positive
- B. Negative
- C. Zero
- D. None of these options are correct
Explanation
If a spring is stretched, then the direction of the applied force and the direction of displacement are the same, and the angle between the force and the displacement is zero, which results in positive work done by the stretching force. W = Fd cos θ As θ = 0, cos θ = +1 So work will be +W (positive).
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About Work
Work is done when a force produces displacement, with its value determined by the component of force along the displacement. The topic covers positive, negative and zero work, work by variable forces from force-displacement graphs, and the connection between net work and change in kinetic energy.
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