NEET Physics (general) MCQ Question
Which of the following combinations are true regarding the work-energy theorem and its implications for conservative and non-conservative forces?
The work-energy theorem applies to both conservative and non-conservative forces without modification; gravitational forces always do work when acting on objects in motion.
The work-energy theorem is valid for non-conservative forces like friction, but does not include the work done by conservative forces such as gravity; work can only be positive.
The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy and is valid for variable forces; gravitational force does no work when acting perpendicular to displacement.
The work-energy theorem can only be applied in scenarios with constant forces; non-conservative forces like friction always do positive work on an object regardless of motion direction.
Correct Answer
Detailed Explanation
The work-energy theorem relates the work done on an object to its change in kinetic energy and is valid for variable forces. Additionally, gravitational force does no work when it acts perpendicular to the direction of motion, such as in the case of circular motion of the moon around the earth.
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