JEE Main 2023 — Work Power Energy Question with Solution
JEE Main 2023 (29 Jan Shift 2)
Question
Identify the correct statements from the following:
(A) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket is negative
(B) Work done by gravitational force in lifting a bucket out of a well by a rope tied to the bucket is negative
(C) Work done by friction on a body sliding down an inclined plane is positive
(D) Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity is zero
(E) Work done by the air resistance on an oscillating pendulum is negative
Choose the correct answer from the options given below:
Choose an option
Show full solutionCorrect option: A
Step-by-step explanation
Work done is given by, , where is the angle between the force and the displacement.
case(A): Direction of force and displacement both are in the same direction and hence work done will be positive. Hence, wrong.
case(B): Direction of force and displacement both are in the opposite direction and hence work done will be negative. Hence, correct.
case(C): Direction of force and displacement both are in the opposite direction and hence work done will be negative. Hence, wrong.
case(D): Direction of force and displacement both are in the same direction and hence work done will be positive. Hence, wrong.
case(E): Direction of force and displacement both are in the opposite direction and hence work done will be negative. Hence, correct.
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This is a previous-year question from JEE Main 2023, covering the Work Power Energy chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.