Which of the following is not conservative force:
Correct answer: A. Friction
- A. Friction
- B. Gravitational
- C. Electric
- D. Elastic spring force
Explanation
Friction is path-dependent and dissipative; work done by friction depends on the path, so it is non‑conservative. The others are conservative forces.
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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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