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प्रश्न
In the previous chapter, a weightlifter is shown holding a barbell steady in her hands (Fig.). Is she doing any work on the barbell while holding it steady?
लघु उत्तर
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उत्तर
No, she is holding the barbell steadily without putting any effort into it.
Work done = Force × Displacement
The barbell does not move while it is being held steadily (s = 0).
∴ W = F × 0 = 0
Because her muscles exhaust her body's internal energy, she may feel worn out, but the work done on the barbell is nothing.
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