Work is said to be negative when F and d are:
Correct answer: B. Anti-parallel
- A. Parallel
- B. Anti-parallel
- C. Perpendicular
- D. At 45o
Explanation
Work W = F d cosθ is negative when cosθ < 0; this occurs when θ = 180°, i.e., force and displacement are opposite (anti‑parallel). So option B is correct.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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