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…

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:

Aicharya · Accepted Answer

Work done is given by, W = F s cos &#952; , where &#952; 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.

Identify the correct statements from the following: (A) Work done by a man in lifting a bucket out of a well…

Solution