Statement (A): Work done by a man in lifting a bucket out of well, by means of a rope tied to the bucket, is positive. Statement (B): In the above case, work done by the gravitational force is negative.
Both A and B are true
Both A and B are false
A is true and B is false
A is false and B is true
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A- Point of application of force is moving along the direction of applied force. Therefore, work done by man on the bucket is positive.
B- Displacement of bucket is opposite to the gravitational force, therefore negative work is done.
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Work done by gravitational force on a man, in lifting a bucket out of the well by rope tied to the bucket is
A bucket filled with water is lowered from terrace to the ground floor with the help of rope. Is the work done by the gravitational force is positive or negative?
Statement 1: A Force acting on a body increases its kinetic energy from 200 J to 400 J and this force does a positive work on the body.
Statement 2: A force does a positive work on an object when the displacement is in the direction of force itself.
The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:
(a) work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.
(b) work done by gravitational force in the above case,
(c) work done by friction on a body sliding down an inclined plane,
(d) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity,
(e) work done by the resistive force of air on a vibrating pendulum in bringing it to rest.
A bucket full of water is drawn up by a person. In this case the work done by the gravitational force is: