OnlineCBT
Physics · WORK, ENERGY AND POWER
हिन्दीConsider the following statements regarding conservative and non-conservative forces: (A) Work done by a conservative force along a closed path is zero. (B) Work done against friction on a body moving on a rough surface always results in a decrease of its mechanical energy. (C) In an inelastic collision, the total linear momentum is conserved, but total energy of the isolated system is not conserved. (D) A conservative force can be written as the negative gradient of potential energy, \( F(x) = -\frac{dV}{dx} \). How many of the above statements are correct?
Correct answer · Option 3
Only three
Explanation
Statements (A), (B), and (D) are correct. Statement (C) is incorrect because total energy of an isolated system is ALWAYS conserved (it converts to heat/sound), even though kinetic energy is not conserved.
