Which one is CORRECT for the WORK done by an agent?
Only the Force must be applied
The Force must move the body
The Force moving the body should be parallel to the direction of motion
The Force perpendicular to the direction of motion does negatively work
Answers
Answer:
Work done is considered positive when the displacement is in the same direction as that of the applied force and negative when the displacement is in the opposite direction of applied force.
(a)Positive
In the given case, force and displacement are in the same direction. Hence, the sign of work done is positive. In this case, the work is done on the bucket.
(b) Negative
In the given case, the direction of force (vertically downward) and displacement (vertically upward) are opposite to each other. Hence, the sign of work done is negative.
(c) As force and displacement are in opposite directions, work done is negative.
(d) As force and displacement are in the same direction, work done is positive.
(e) As force and displacement are in opposite directions, work done is negative
Explanation:
Work is how much energy is done by a force over a distance. Suppose we needed to set up ice hockey goal nets. Initially the nets are standing still with zero velocity at the edge of the ice hockey rink. When you push a net, it will start moving at some speed; it has velocity. If there is a velocity then the net now has kinetic energy. Because the direction of the push and the movement of the net are in the same direction, there is now positive energy: the goalie net went from zero energy to some amount of positive kinetic energy. This is an example of positive work.