Give five example of negative work done with explanation?
(1) The work done by the frictional force, when we push the book to a distance.
(2) The work done by the gravitational force, when we are lifting a bucket of water from the well.
(3) The work done by the gravitational force, when we are climbing on a tree.
(4) The work done by the frictional force of air, when a ball is falling downwards.
(5) The work done by the buoyant force, when a coin is sinking.
In all the above cases, the force acts opposite to the direction of motion.