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Work And Energy — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceWork 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
  • D
    All the central forces are non-conservative
✓

Answer

  1. All the central forces are non-conservative

Explanation:

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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