Propulsion force of a rocket is____________________?
Correct answer: A. non-conservative force
- A. non-conservative force
- B. conservative force
- C. both A and B
- D. none of these
Explanation
Rocket thrust is produced by ejecting gases and depends on the changing mass and interaction of the rocket with its exhaust, so it is treated as a non-conservative force. A conservative force, the likely mistaken choice, has work determined only by initial and final positions, as in gravity or an ideal spring.
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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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