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Work, Power And Energy — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceWork, Power And Energy1 Mark
MCQ
Which of the following statements is incorrect?
  • A
    No work is done if the displacement is perpendicular to the direction of the applied force
  • B
    If the angle between the force and displacement vectors is obtuse, then the work done is negative
  • C
    Frictional force is a non$-$conservative
  • ✓
    All the central forces are non$-$conservative
✓

Answer

Correct option: D.
All the central forces are non$-$conservative
Non$-$conservative force such as friction depends on other factors, such as velocity and dissipative and no potential energy can be defined for them.
Hence central forces are non$-$conservative.

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