Which of the following is a pair of conservative and non conservative forces?
Correct answer: A. Gravitational forces and elastic forces
- A. Gravitational forces and elastic forces
- B. Frictional force and propulsion of a motor
- C. electric force and tensioning string
- D. propulsion force of rocket and air resistence
Explanation
There are conservative and non-conservative forces. A conservative force is not path dependent, such as gravity and electrostatic forces. This means that the net work done by the force is only dependent on the initial and final positions if it is considered an outside force. If the system is defined so that a conservative force is doing work inside the system, such as an Earth and falling object system, the force only transforms the energy to a different form, but does not change the total energy of the system.
This question appeared on the ETEA MDCAT 2005 paper, which you can sit online with every answer explained.
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