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

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B and D only

B, D and E only

B and E only

A and C only

answer is C.

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Detailed Solution

A) In the process of lifting a bucket from a well man does positive work, as the force and displacement are in same direction.
B) In the process of lifting a bucket from a well gravitational force does negative work, as the gravitational force and displacement are in opposite directions.
C) Friction does negative work on block sliding down, as the friction and displacement are in opposite directions.
D) Work done by applied force is non-zero due to friction force.
E) Air resistance does negative work on oscillating pendulum as it acts opposite to direction of motion.

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