Question

Which of the following statements is incorrect?

• A. Nowork 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-conservation
• D. All the central forces are non-conservative

Answer 1

Answer: (D)

All the central forces are non-conservative

Answer 2

All the central forces are conservative. All other statements are correct.